2017 Meeting of the APS Division of Particles and Fields (DPF 2017)
Monday 31 July 2017 - Friday 04 August 2017 Fermi National Accelerator Laboratory
Book of Abstracts
Contents
Gamow penetration factor for nuclear fusion reaction in quantum plasmas ...... 1
Pion Polarizability at CERN COMPASS ...... 1
The Mu2e Experiment at Fermilab ...... 2
Novel Application of Density Estimation Techniques in Muon Ionization Cooling Experi- ment ...... 2
Sommerfeld-Enhanced J-Factors For Dwarf Spheroidal Galaxies ...... 2
CompEx II: A Pathway in Search of BSM Physics using Compton Scattering ...... 3
Mapping the QCD radiation spectrum ...... 4
Are PDFs still consistent with Tevatron data? ...... 4
The REDTOP experiment: Rare Eta Decays with a TPC for Optical Photons ...... 4
Beyond Standard Model scales constrained by recent double beta decay experimental data 5
Lepton flavor violating meson decays ...... 5
Measurement of Ionization Cooling With the MICE Experiment ...... 5
Investigation of Beam Emittance and Beam Transport Line Optics on Polarization . . . . 6
Probing MeV Scale Physics in LArTPCs with Radioactive Calibration Sources ...... 6
Search for evidence of Type-III seesaw mechanism in multilepton final states in pp colli- sions at 13 TeV ...... 7
Results from the MAJORANA DEMONSTRATOR ...... 7
Precision Higgs Measurements at the 250 GeV ILC ...... 7
The Potential of the ILC for Discovering New Particles ...... 8
Toward Precision Top Quark Measurements in e+e- collisions ...... 8
Current Analysis Status for the Inclusive Neutral Current π0 Production Cross section Mea- surement with the NOvA Near Detector ...... 9
Radiation-Hard/High-Speed VCSEL Array Driver ASIC for HL-LHC ...... 9
Search for production of a Higgs boson and a single top quark ...... 9
iii Search for supersymmetry in multijet events with missing transverse momentum in proton- proton collisions at 13 TeV ...... 10
Search for new physics with dijet angular distributions in proton-proton collisions at 13 TeV at CMS ...... 10
Search for supersymmetry using boosted Higgs bosons and missing transverse momentum in proton-proton collisions at 13 TeV ...... 11
Search for paired dijet resonances in the boosted and non-boosted regime with the CMS detector at 13 TeV ...... 11
Inclusive search for boosted SM Higgs bosons using H to bb decays with the CMS detector at 13 TeV ...... 11
Search for Top-Anitop Quark Resonances in Boosted Semileptonic Final States in 13TeV pp Collisions ...... 12
Testing data connections for use with the HL-LHC CMS forward pixel electronics . . . . 12
CMS Software and Computing in LHC Run 2 (and Beyond) ...... 12
SUSY searches using top quark tagging at CMS ...... 13
Search for new resonances decaying into boosted W, Z and H bosons at CMS ...... 13
The proton radius puzzle ...... 13
Study of neutron-induced background hits in the CMS endcap muon system, and implica- tions for the HL-LHC ...... 14
Charged Higgs production with a W boson via b-quark annihilation ...... 14
Search for light vector resonances decaying to a quark pair produced in association with a jet with the CMS detector at 13 TeV ...... 15
Nucleon Decay in Super-Kamiokande: Results and Prospects ...... 15
Searches for new heavy resonances in final states with leptons, photons, and jets inCMS 15
Jet Energy Scale and Resolution Measurements at CMS ...... 16
Searches for new resonances decaying into diboson final states with large missing trans- verse momentum ...... 16
Search for SM Higgs Boson in the H->tautau->mumu decay mode with the CMS experiment at 13TeV ...... 17
Measurement of the tt¯spin correlations and top quark polarization in dileptonic channel 17
PDF Flavor Determination with LHC W/Z production ...... 17
Plans for the Upgrade of the CMS Barrel Electromagnetic Calorimeter ...... 18
Search for vector-like quarks with oppositely-charged dilepton pairs, jets, and missing transverse energy in proton-proton collisions at centre-of-mass energy of 13 TeV . . 18 Regge Trajectories of triply heavy baryons ...... 18
CEPC R&D and key technologies ...... 19
One-loop effects on Z boson decays in the SMEFT ...... 19
Searches for electroweakly produced supersymmetry with CMS ...... 20
Muon Neutrino Dissapearance in the NOvA experiment ...... 20
Searches for Heavy Resonances Decaying to a W or Z Boson and a Higgs Boson with the ATLAS experiment ...... 21
Search for pair production of Higgs bosons in the b¯bb¯b final state with the ATLAS experi- ment ...... 21
Bunched beam cooling for hadron colliders ...... 21
Top-pair and tW production at approximate Nˆ3LO ...... 22
Search for Dark Matter in Jets plus MET final state for Non-thermal Dark Matter, Fermion Portal and ADD models using data from Proton-Proton Collisions at √s = 13 TeV. . . 22
Search for 3rd generation superpartners with the ATLAS experiment ...... 22
Real time trigger rate monitoring at CMS ...... 23
A search for charged Higgs bosons with the ATLAS experiment ...... 23
Microhexcavity Plasma Panel Detectors ...... 23
ADMX - axion dark matter experiment ...... 24
The LUCID-2 detector ...... 24
Search for pair production of vector-like quarks in final states with a boosted W boson and b-jet with the ATLAS experiment ...... 25
Ultra long-lived particles searches with MATHUSLA ...... 25
Operation and Performance of the ATLAS Level-1 Calorimeter and Level-1 Topological Triggers in Run 2 at the LHC ...... 26
Shower reconstruction performance studies for DUNE far detector ...... 26
Search for diphoton high-mass resonances with 36.7 fb−1 of data collected at √ s=13 TeV with the ATLAS experiment ...... 26
± −1 Search√ for high-mass Zγ and W γ resonances using 36 fb of data from pp collisions at s = 13 TeV with the ATLAS experiment ...... 27
Combined measurements of the Higgs boson production and decay rates using pp collisions at √s = 13 TeV with the ATLAS Experiment ...... 27
Science writing workshops with the ATLAS experiment ...... 28
The Cosmological Principle Breaks Down as Superstructures Grow in the Universe . . . 28 Physics Reach and Detector Optimization at the CEPC ...... 29
Using the Jets-without-Jets Algorithm to Model MET in an ATLAS Level-1 Trigger Algo- rithm ...... 29
US-CERN Virtual Visits: Building Transcontinental Connections for High Energy Physics 29
Search for new physics phenomena using events with missing transverse momentum and a Higgs boson decaying into two photons at sqrt(s) = 13 TeV with the ATLAS experiment ...... 30
Searching for heavy ZZ resonance in four-lepton or di-lepton and di-neutrino final states with the ATLAS experiment ...... 30
Little hierarchy in the minimally specified MSSM ...... 31
Search for low mass dijet resonances in association with ISR at the ATLAS experiment . 31
Measurement of Higgs boson production in the diphoton decay channel with the ATLAS experiment ...... 31
Dimension 7 neutrino mass generation and its implications for the LHC and the dark matter ...... 32
The Short Baseline Near Detector at Fermilab ...... 32
New fermionic dark matters, extended standard model and cosmic rays ...... 33
Black hole unitarity via small couplings: basic postulates to soft quantum structure . . . 33
On HQET and NRQCD Operators of Mass Dimension 8 and Above ...... 34
CMS Pixel Detector Upgrade for HL-HLC ...... 34
Upgrade of the ATLAS Monitored Drift Tube Electronics for the HL-LHC ...... 34
PROSPECT: The Precision Reactor Oscillation and Spectrum experiment ...... 35
Performance of the ATLAS Tile Calorimeter in Run 2 and Electronics Upgrade for High Luminosity LHC ...... 35
Front End Digitization of tRPCs in the ATLAS Muon Spectrometer Phase-1 Upgrade . . 36
Enhancing the muon physics program of the CMS experiment during the high luminosity LHC with triple-foil GEM detectors in the forward region ...... 36
Dark matter collider at DUNE: relativistic scattering of boosted dark matter ...... 36
An Indirect Search for Weakly Interacting Massive Particles in the Sun Using Upward- Going Muons in NOvA ...... 37
Search for electroweak production of a vectorlike quark decaying to a top quark and a Higgs or Z boson using boosted topologies in an all-hadronic final state ...... 37
Semileptonic B-meson decays to light pseudoscalar mesons with lattice QCD ...... 38 Measurement of quantum interference between doubly and singly resonant top quark pro- duction with the ATLAS experiment ...... 38
Search for the Higgs boson production in association with top quarks at \sqrt{s} = 13 TeV with the ATLAS detector ...... 39
Searches for new physics using long-lived particles with the CMS detector ...... 39
Modeling Radiation Damage to Pixel Sensors in the ATLAS Detector ...... 39
Data Acquisition with GPUs for the Muon g-2 Experiment at Fermilab ...... 40
Instantaneous luminosity calibration of the ATLAS experiment with Z → µ−µ+ . . . . 40
Search for ttH production in multilepton final states using the ATLAS experiment atthe LHC ...... 41
Deep Neural Networks for HEP Images ...... 41
Commissioning and operation of the new CMS Phase 1 pixel detector ...... 41
Cold electronics preparation for the protoDUNE experiment ...... 42
Reaching Out for Particle Physics ...... 42
Search for lepton-flavour-violating decays of the Higgs boson with the ATLAS experiment ...... 42
Search for Dark Matter Produced in Association with a Higgs Boson Decaying tobbat sqrt(s) = 13 TeV with the ATLAS Experiment ...... 43
A Flux Spectrometer for LBNF/DUNE ...... 43
Developments in International Masterclasses ...... 44
Development of Trigger and Readout Electronics for the ATLAS New Small Wheel Detector Upgrade ...... 44
Quark versus Gluon Jet Tagging Using Charged-Particle Constituent Multiplicity withthe ATLAS Experiment ...... 44
Search for Contact Interactions in μ + μ − and e + e − Final States in 13 TeV p-p Collisions at CMS ...... 45
Recent Developments in T2K Oscillation Analysis ...... 45
Data unfolding with Wiener-SVD Method ...... 45
Phantom of the Universe: A Planetarium Show about Dark Matter ...... 46
Search for dark matter produced in association with a hadronically decaying vector boson at the ATLAS experiment ...... 46
Searches for Neutron-Antineutron Oscillation in DUNE ...... 47
Performance Studies of Capacitively Coupled HVCMOS Pixel Sensors Before and After Gamma Irradiation ...... 47 The Low Background Laboratory at Idaho State University ...... 48
Small Instantons and the Strong CP Problem ...... 48
Track Reconstruction Efficiencies with the H35DEMO HV-CMOS Pixel Detector . . . . . 49
Search for Dark Interactions with the ATLAS experiment ...... 49
Status of the Charged Pion Semi-Inclusive Neutrino Charged-Current Cross Section in NOvA ...... 50
Direct measurement of the top quark mass in pp¯ collisions at D0 ...... 50
Measurement of the pole mass of the top quark using pp̄ → tt̄ production cross sections at D0 ...... 50
Forward-backward asymmetry in pp̄ → tt̄ events at the Tevatron ...... 51
Measurement of charge asymmetry in B → μD0 X decays at D0 ...... 51
Exotic multiquark states in pp̄ collisions at D0 ...... 51
Search for the dimuon decay of the Higgs boson with the ATLAS experiment ...... 52
Results on D-mixing in CP-odd mode: D->Ksomega, omega->pi+pi-pi0 at Belle . . . . . 52
Measurement of the cross section of the production of a top quark pair in association with a photon in pp collisions at 8 TeV ...... 53
A seach for a charged Higgs decaying into a top and a bottom quark with single leptonic, an electron or a muon, final state at 13 TeV ...... 53
Measurement of PTFE Reflectance for Xenon Scintillation Light ...... 53
Improved Search for a Light Sterile Neutrino at Daya Bay, and Combined Analysis with MINOS and Bugey-3 ...... 54
Heavy Flavor measurements and production studies at CMS ...... 54
Beam Based RF Voltage Measurements at the Fermilab Booster (RCS) for Intensity Upgrade ...... 55
Measuring the b-tagging Efficiency in ATLAS ...... 55
Measurement of Neutrino Flux In The DUNE Near Detector ...... 56
Fundamental Physics from SZ Cluster Surveys with CMB and Optical Lensing Mass Cali- bration ...... 56
Delensing CMB B-modes: results from SPT...... 56
A Boosted Event Shape Tagger for Heavy Object Classification ...... 57
Perturbative charm production and the prompt atmospheric neutrino flux in light of RHIC and LHC ...... 57
Constraints on the astrophysical flux and the dark matter decay with IceCube HESEdata 58 VENu: The Virtual Environment for Neutrinos ...... 58
Measurement of same-sign WW diboson production with the ATLAS experiment . . . . 59
Muon Intensity Increase by Wedge Absorbers ...... 59
Design of the LBNF Beamline ...... 59
Selection of charged-current muon-neutrino and electron-neutrino interactions in the DUNE far detector ...... 60
Near-Infrared Scintillation of Liquid Argon ...... 60
Search for invisible decay of a dark photon produced in e+e− collisions at BaBar . . . . 61
Search for muonic dark force at BABAR ...... 61
Recent measurements of exclusive hadronic cross sections at BABAR and the implication for the muon g-2 calculation ...... 61
Precise measurements of the mass differences between the D∗(2010)+, and the D+ and D0 mesons with the BaBar detector ...... 62
Search for the Lepton Flavor Violating Decay Υ(3S) → e±µ∓ ...... 62
Flavored Dark Matter and a Secret Asymmetry ...... 63
Gain stabilization of Silicon Photomultipliers and Afterpulsing ...... 63
Pure and semi-leptonic decays of D(s) at BESIII ...... 63
Hadronic decays of D(s) at BESIII ...... 64
Study of Lambda_c decays at BESIII ...... 64
Search for production of supersymmetric particles in final states with missing transverse momentum and multiple b-jets at s√=13˜TeV proton-proton collisions with the ATLAS experiment ...... 65
The Calorimeter Global Feature Extractor (gFEX) for the Phase-I Upgrade of theATLAS experiment ...... 65
Testing, Installation, Integration and Performance Studies of a Cosmic Ray Tagging System for the Short Baseline Neutrino Program Far Detector (ICARUS) ...... 65
Measurement of Neutral Current Coherent Pi0 Production In The NOvA Near Detector . 66
LBNF Optimized Horn Design & Target Integration ...... 66
Design and Fabrication of the ProtoDUNE Dual Phase LArTPC ...... 67
A Minimal non-universal EW extension of the Standard Model: A chiral family of models 67
Exploring Cosmic Rays with a High School Student Global Detector ...... 68
The Mu2e Solenoid Cold Mass Position Monitor System ...... 68
A Study of Mass Matrices with Permutational Symmetry for Quark Families ...... 69 Radiative Decays of the Higgs Boson to a Pair of Fermions ...... 69
Search for vector-like quarks in fully hadronic final states with the ATLAS detector . . . 69
A search for B-L R-parity-violating scalar top decays in √s=13 TeV pp collisions with the ATLAS experiment ...... 70
JSNS2: A sterile neutrino search in Japan ...... 70
Measurement of Neutrino-Electron Elastic Scattering at NOvA Near Detector ...... 70
Lepton-flavour violation in a Pati-Salam model with gauged flavour symmetry ...... 71
CosmicWatch: the Desktop Muon Detector ...... 71
Search for production of a Higgs boson and a top quark pair at CMS ...... 72
Search for Vector-like Top Quarks in di-Leptons ...... 72
Recent progress on wire-cell tomographic reconstruction for LArTPC ...... 72 √ Search for Higgs boson pair production in the bbW W final state at s = 13 TeV with the ATLAS detector ...... 73
Inclusive search for vector-like T quark pairs in leptonic final states in proton-proton colli- sions at √s = 13 TeV ...... 73
New Physics in b -> s mu+ mu- after the Measurement of R_K* ...... 73
Generalized CP: Yukawa Interactions ...... 74
Search for vector-like B quarks with oppositely-charged dilepton pairs in proton-proton collisions at 13 TeV ...... 74
Status of an Alternative Measurement of the Inclusive Muon Neutrino Charged-current Cross Section in the NOvA Near Detector ...... 75
The formalization of the relation between wave and particle and the unifying of three kinds of wave-particle duality ...... 75
Soft Gluon Resummation at NNLL Accuracy for Associated ttH¯ Production at the LHC . 76
Physics reach of electron neutrino appearance measurements in NOvA ...... 76
Data analysis at CMS Level-1 Trigger ...... 76
Background estimation for the electron neutrino appearance analysis in NOvA . . . . . 77
Searching for Neutrino-Induced Neutron Production at the Spallation Neutron Source (SNS) on Lead Target ...... 77
Design of a Nitrogen Cooled Target Shield Pile for the LBNF Beamline ...... 78
COHERENT at the Spallation Neutron Source ...... 78
Critical behavior of SU(3) lattice gauge theory with 12 light flavors ...... 78
Looking at BNB Neutrinos in the NOvA Near Detector ...... 79 Search for the Higgs Boson Decays into Dimuons at CMS ...... 79
HEPCloud: Provisioning 160,000 Compute Cores for Science ...... 80
Track extrapolation and muon identification in Belle II event reconstruction ...... 80
Status of Sterile Neutrino fits with Global Data ...... 80
Thomas-Fermi quark model for mesons ...... 81
Spectroscopy of lattice SU4 gauge theory with fermions in multiple representations . . . 81
Exclusion of multifold solutions of the CKM Unitarity Triangle by a time-dependent Dalitz plot analysis of B0->D(*) h0 with D->K_S0 pi+ pi- decays combining BaBar and Belle data ...... 81
The FabrIc for Frontier Experiments Project at Fermilab: Computing for Experiments . . 82
Event Reconstruction in the NOvA Experiment ...... 82
What does a non-vanishing neutrino mass have to say about the strong CP problem? . . 83
Tracking Detector Performance and Data Quality in the NOvA Experiment ...... 83
Alternative Formulation of the z-Expansion in Semileptonic Decays ...... 84
Prospects for Neutron-Antineutron Oscillation Searches with Convolutional Neural Net- works in Liquid Argon Time Projection Chambers ...... 84
ATLAS LAr Calorimeter Electronics Upgrade for the HL-LHC ...... 84
Fertile neutrinos ...... 85
Addressing the Proton Radius Puzzle Using QED-NRQED Effective Field Theory . . . . . 85
Particle Identification and Kaon Physics in LArIAT ...... 86
Searches for dark matter with the Super-Kamiokande detector ...... 86
Characterizing New Detectors for SuperCDMS SNOLAB ...... 86
Measuring the tt¯Forward-Backward Asymmetry using semi-leptonic final states at 8 TeV with the CMS detector ...... 87
Summary of the Second Numu Disappearance Results from the NOvA Experiment . . . 87
UIUC diversity and inclusion efforts in STEM education ...... 87
Thermodynamics of SU(4) gauge theory with fermions in multiple representations . . . . 88
Construction of the Phase 1 upgrade of the CMS pixel detector ...... 89
GPUs in LHCb for Analysis ...... 89
Survey of the physics landscape and attempts to improve diversity...... 90
Present status of the search for the K—>π0νν decay with the KOTO detector at J-PARC . 90 Kaon-Scatter Introduced Backgrounds in the KOTO Experiment ...... 90
Using the PPFX package for the DUNE Experiment ...... 91
Search for compressed supersymmetry using low pT leptons and missing transverse energy with the ATLAS detector ...... 91
New Physics Implication of Higgs Precision Measurements ...... 92
Jet Calibration in the ATLAS Experiment ...... 92
The Simons Observatory: Cosmology and Fundamental Physics from the Cosmic Microwave Background ...... 93
Mu2e Trigger & DAQ Design and Challenges ...... 93
Search for a large muon neutrino magnetic moment in the NOvA Near Detector . . . . . 93
Probing new physics scale through dimension-6 operator and enhanced tth¯ and hh produc- tion at the LHC ...... 94
Neutrino physics with dark matter detectors ...... 94
Electroweak precision measurements with the CMS detector ...... 95
Search for electroweak√ production of supersymmetric particles in the two and three lepton final state at s = 13 TeV with the ATLAS detector ...... 95
Neutrino energy reconstruction in the DUNE far detector ...... 95
A study of charged kaon-nucleon total interaction cross section in liquid argon...... 96
Antiproton Annihilation on Argon Nuclei in LArIAT ...... 96
The Construction and Commissioning of the Belle II iTOP Counter ...... 97
An overview of the ANNIE experiment at Fermilab ...... 97
Analytic Neutrino Oscillation Probabilities in Matter Revisited...... 97
Recent results of charmed baryon decays at Belle ...... 98
The NOvA Data Driven Trigger ...... 98
Optimization of the LBNF Neutrino Beam ...... 98
A Panel Prototype for the Mu2e Straw Tube Tracker at Fermilab ...... 99
Double Gauge Boson Production in the Standard Model EFT ...... 99
Status of the Electron-Neutrino Charged-Current Inclusive Cross-Section Measurement in NOvA ...... 100
LUX, and the Combating of the Lamppost Effect ...... 100
Front-End Electronics Scheme for the Mu2e Straw Tracker ...... 100
LAr Scintillation Light Detection, Simulation and Analysis in LArIAT ...... 101 Monte Carlo Simulations of the PEN experiment: A Precision Measurement of π →eν(γ) Branching Ratio ...... 101
NNLO QCD Predictions of W and Z Bosons in proton-proton collisions at 7, 8, 13, 14 and 100 TeV Center of Mass Energies ...... 102
Project 8: A New Generation of Neutrino Mass Experiment ...... 102
Neutrino-Nucleus Deep Inelastic Scattering (DIS) results from MINERvA ...... 102
Recent MINERvA Double Differential CCQE Cross Section Results Using Lepton Kinemat- ics ...... 103
Nuclear Dependence of Quasi-Elastic Scattering at MINERvA ...... 103
Antineutrino to neutrino charged-current interaction cross section ratio in MINERvA . . 103
NOvA Short-Baseline Tau Neutrino Appearance Search ...... 104
Measurement of Electron Attenuation using Cosmic Ray Muons in the MicroBooNE Detec- tor ...... 104
Overview of the Fourth Flight of the ANITA Experiment ...... 105
Studies of GaInP based Geiger-mode APD arrays ...... 105
The LArIAT Experiment ...... 106
Calibration of gBlocks using Offline Jets for the gFEX Subsystem of the ATLAS Level1 Calorimeter Trigger ...... 106
Background Simulations for the LUX-ZEPLIN Experiment ...... 106
Recent results of EXO-200 and R&D progress of nEXO ...... 107
New Search for Mirror Neutrons at HFIR ...... 107
TeV Particle Astrophysics with the High Altitude Water Cherenkov (HAWC) Detector . 107
Cross Section Predictions of W/Z + Jets at LHC ...... 108
Normalizing to the Number of Stopped Muons in the Mu2e Experiment ...... 108
Preliminary Results from the AlCap Experiment ...... 109
Mu2e Solenoid Field Mapping System ...... 109
Skimming tau neutrinos and tau showers in the atmosphere ...... 110
Exploration of Deep Convolutional and Domain Adversarial Neural Networks in MINERvA...... 110
MicroBooNE Investigation of Low-Energy Excess Using Deep Learning Algorithms . . . 110
Studies with the LArIAT Light Collection System ...... 111
The LUX-Zeplin Dark Matter Search: detector design and sensitivity ...... 111 Extracting neutrino oscillation parameters using a simultaneous fit of the nue appearance and numu disappearance data in the NOvA experiment ...... 112
Quarkonium Production in Jets ...... 112
Detecting Axions with Superconducting Qubits ...... 112
Dark Matter Searches with HAWC ...... 113
Refinement of the Pion PDF implementing Drell-Yan Experimental Data ...... 113
Optical Ring Resonators for HEP and Cosmology Applications ...... 114
Design, construction and characterization of a three channel of cosmic ray detector . . . 114
Beam Line Extinction in the Mu2e Experiment ...... 115
New Measurement of Atmospheric Neutrino Oscillations with IceCube ...... 115
Histogram Binning with Bayesian Blocks ...... 115
Towards a new approach to cosmology with the Dark Energy Survey and Gravitational Waves ...... 116
DES & Planck survey: Galaxy group-tSZ cross correlation ...... 116
Standard Model EFT and Extended Scalar Sectors ...... 117
Galaxy Cluster Science Results with the Dark Energy Survey ...... 117
Photometric Properties and Stellar Masses in Dark Energy Survey Galaxy Clusters . . . 117
A search for BH dark matter using microlensing in the Dark Energy Survey ...... 118
Measuring Polarized Gluon Distributions by Heavy Quark Spin Correlations and Polariza- tions ...... 118
Charged Lepton Flavor Violation in Electron-Positron Scattering: Calculations of Cross Section and Asymmetry Using an Effective Field Theory ...... 119
Zero-Range Effective Field Theory for Resonant Wino Dark Matter ...... 119
Impact of Neutrino Decay on Sterile Neutrino Search in IceCube ...... 120
Flavor gauge models below the Fermi scale ...... 120
Mass Dependence of Higgs Production at Large Transverse Momentum ...... 120
Full TPC Signal and Noise Simulation ...... 121
The SENSEI project ...... 121
The DAMIC Experiment at SNOLAB ...... 122
Studies of Radiation Damage to Silicon Photomultipliers ...... 122
Characterizing LArTPC detector performance with MicroBooNE ...... 122 Drifted Charge Extraction in Single Phase LArTPCs ...... 123
Emission of Photons and Relativistic Axions from Axion Stars ...... 123
Liquid argon test of the ARAPUCA device at the National Laboratory of Synchrotron Light in Campinas (São Paulo) ...... 123
Pion Production Measurements at MINERvA ...... 124
Recent progress from the SPT-3G experiment ...... 124
Reducing neutrino cross-section uncertainties with the NuPRISM experiment ...... 125
Searching for Dwarf Galaxies with DECam ...... 125
Explaining Diverse Rotation Curves of Spiral Galaxies with Self-Interacting Dark Matter 125
Solar and Supernova Neutrinos in Super-Kamiokande ...... 126
Measurement of Reconstructed Charged Particle Multiplicities of Neutrino Interactions in MicroBooNE ...... 126
Imposing LHC constraints on the combined Anomaly and Z’-Mediation mechanism of Su- persymmetry Breaking ...... 127
Cosmology from CMB Polarization with POLARBEAR and the Simons Array ...... 127
CAPTAIN: Current Neutron and Future Stopped Pion Neutrino Measurements ...... 128
Revisiting Dyons in Particle Physics ...... 128
Accelerator Driven Subcritical Reactors for Weapons-Grade Plutonium Disposition and En- ergy Generation ...... 129
MuSim, a Graphical User Interface for Multiple Simulation Codes ...... 129
Muon Cooling Innovations and the Future of Bright Muon Beams ...... 130
Constraining the Nature of Dark Matter with the Milky Way Satellite Galaxies ...... 130
The ACTPol and Advanced ACTPol Experiments ...... 131
The SuperCDMS Soudan High Mass Analysis ...... 131
Brookhaven Women in Science - Promoting Women, Advancing Science ...... 131
Beauty-full Tetraquarks ...... 132
Supersymmetric Resonant Dark Matter: an Explanation to AMS-02 Positron Excess . . . 132
Recent Results on Radiative and Electroweak Penguin B decays at Belle ...... 132
Design and status of the Mu2e crystal calorimeter ...... 133
Quality Assurance on Un-Doped CsI Crystals for the Mu2e Experiment ...... 133
Pre-production and quality assurance of the Mu2e Silicon Photomultipliers ...... 134 Sterile Neutrino Searches with NOvA ...... 134
NuMI Target and Horn Studies for NOvA ...... 135
Detector performance and cosmic-ray reconstruction efficiency in MicroBooNE . . . . . 135
Automated proton track identification in MicroBooNE using gradient boosted decision trees ...... 136
NNLO QCD Predictions ...... 136
Data Acquisition and Triggering for the KOTO Experiment ...... 136
Enhanced tth¯ and Di-Higgs production rates in the Two Higgs Doublet Model ...... 137
First Dark Matter Search Results from the XENON1T Experiment ...... 137
Large Neutrino Mixing Angles in Minimal SO(10) Unification ...... 137
A High Efficiency Cosmic Ray Veto Detector for the Mu2e Experiment at Fermilab . . . 138
Cosmic Ray Backgrounds in the Mu2e Experiment at Fermilab ...... 138
Studies of Beam Induced Radiation Backgrounds at the Mu2e Experiment and Implications for the Cosmic Ray Veto Detector Operations ...... 139
Performance of Scintillation Counters with Silicon Photomultiplier Readout ...... 139
A Neural Net Trigger for a Monopole Search with the NOvA Far Detector ...... 139
Muon Tomography of Galeras Volcano: first results leaded by young scientists in Colombia ...... 140
Radiopurity Screening and Radiological Simulation for DUNE ...... 140
Applying Deep Learning in MicroBooNE ...... 141
Sterile neutrino search in the NOvA Far Detector...... 141
Searches for exotica at LHCb ...... 142
Lepton-flavour universality tests with semi-leptonic B decays atLHCb ...... 142
Semi-leptonic B decays at LHCb ...... 142
CP violation and mixing in charm at LHCb ...... 143
Rare decays at LHCb ...... 143
New physics searches in b->sll decays ...... 143
Heavy hadron spectroscopy at LHCb ...... 144
Pentaquark & tetraquark states at LHCb ...... 144
Heavy flavour production at LHCb ...... 144
0 − A novel, precise measurement of Bs and Ds lifetimes at LHCb ...... 145 Advanced machine-learning solutions in LHCb operations and data analysis ...... 145
Two Top Utilities of Two Higgs Doublets: Electroweak Baryogenesis and Alignment . . 145
Exploring end-to-end image-based deep learning for particle & event classification . . . 146
Deep Learning and DUNE ...... 146
Status of Two-Higgs-doublet model with LHC 13 TeV data ...... 147
Signal Simulation and Processing in the MicroBooNE LArTPC ...... 147
Current status of MSSM Higgs sector with LHC 13 TeV data ...... 148
Update on CTEQ-TEA PDFs ...... 148 protoDUNE-SP Cold Electronics Quality Control ...... 148
QCD multiple scattering in cold nuclear matter ...... 149
Conceptualization of a Scientific Software Innovation Institute for HEP and a Community Roadmap Process for Software and Computing R&D ...... 149
Direct CP asymmetry in D -> piˆ+\piˆ- and D -> Kˆ+Kˆ- from QCD Light-Cone Sum Rules 150
The XENONnT Dark Matter Experiment ...... 150
P5’ anomaly for top: tZ’ associated production at LHC ...... 150
The NEXT Experiment ...... 151
Design layout and expected performance of Inner Tracker for ATLAS Phase 2 Upgrade . 151
The spin-dependent quark beam function at NNLO ...... 151
Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay ...... 152
Observing Neutrinos from the Next Galactic Supernova with the NOvA Detectors . . . . 152
Single W/Z boson production cross sections with the CMS detector ...... 153
Mu2e Diversity and Inclusion Task Force ...... 153
Prospects for rare B decays at Belle II ...... 154
Design and Simulation of the IsoDAR RFQ Direct Injection System and Spiral Inflector . 154
Seasonal Variations of multiple-muons in NOvA ...... 154
Belle II Distributed Data Management System and Networking ...... 155
Analytic resummation of TMD distributions in momentum space in SCET_II...... 155
Large-scale Simulation and Data Processing in the NOvA Experiment ...... 156
Measuring the pairwise kinematic Sunyaev-Zel’dovich effect with the Atacama Cosmology Telescope ...... 156 Advocating for HEP in Congress ...... 157
Dark Matter Search Results from the PICO-60 C3F8 Bubble Chamber ...... 157
Cluster Cosmology with the South Pole Telescope ...... 157
Towards a high precision calculation for the longitudinal spin asymmetry in deep inelastic scattering ...... 158
Social media and innovative outreach ...... 158
Exploring Computing Methods for Improved Cosmic Background Rejection in NOvA’s Ster- ile Neutrino Searches ...... 159
Study of Galaxy Evolution in DES Clusters ...... 159
Directional measurements of fast neutron backgrounds at SuperKEKB ...... 160
ProtoDUNE Trigger Study ...... 160
Spanish Outreach at Fermilab ...... 161
Deep Learning Applications in the NOvA Experiment ...... 161
Panel for Fairness in Diversity & Gender Equality Efforts ...... 161
Gauge Model for Minimal Flavor Violation ...... 162
Energy reconstruction of NOvA neutrino events...... 162
Ongoing Community Efforts in Machine Learning in Particle Physics ...... 162
Better public talks…through science! ...... 163
Comparison of the F2 Structure Function in Iron as Measured by Charged Lepton and Neu- trino Probes ...... 163
QCD and Short-Range Correlations in Nuclei ...... 164
Studies of quarkonium at Belle and Belle II ...... 164
The energy distribution of subjets and the jet shape ...... 164
Search for the critical point in hot QCD matter ...... 165
News from BICEP/Keck Array CMB program ...... 165
The LHCb Upgrades ...... 166
A Novel Readout System for a High Efficiency Cosmic Ray Veto for the Mu2e Experiment 166
Current Status and Commissioning of the SNO+ Experiment ...... 166
Silicon and Germanium Ionization Yield Measurements with Neutron Beams ...... 167
Light Dark matter eXperiment ...... 167
Fermilab PIP-II Status and Strategy ...... 168 Z’ Models for B Anomalies at the LHC ...... 168
3D Diamond Sensor Development ...... 168
Overview of the CEPC Vertex Detector ...... 169
Plans for Ultra-intese beams at FACET-II and experiments to probe High ...... 169
Laser-plasma-based linear collider using hollow plasma channels ...... 170
Upgrade of the ATLAS Muon Spectrometer for Phase II ...... 170
The ATLAS Trigger Menu design for higher luminosities in Run 2 (TDAQ) ...... 170
The ATLAS Trigger algorithms upgrade and performance in Run 2 (TDAQ) ...... 171
A uniform magnetic field generator system and a Cu hybrid cosmic ray detector of4chan- nels ...... 172
Theory talk on Higgs ...... 172
Theory ttH ...... 173
Effects of Magnetic Horn Geometry Uncertainty on Neutrino Flux atDUNE ...... 173
A particle hypothesis based approach for energy estimation in muon neutrino charged current events at NOvA ...... 173
CP violation measurements in b hadrons at LHCb ...... 174
Studies of effect of aging and studies to optimize scintillation counter response for theMu2e Cosmic Ray Veto System ...... 174
The MoEDAL Experiment at the LHC - a new light on the High Energy Frontier . . . . . 174
Panel and Discussion ...... 175
Panel and discussion ...... 175
Panel on Equity, Diversity and Inclusivity in Science Culture ...... 175
Measurement of the effective weak mixing angle in dimuon events at D0 and combination of the weak mixing angle measurements and W mass extraction at the Tevatron . . . 175
Welocme from DPF ...... 176
Welcome from Fermilab ...... 176
Properties of the Higgs boson ...... 176
Searches for new physics at the energy frontier ...... 176
Physics at the future colliders ...... 176
WIMP dark matter searches progress and plans ...... 176
Progress and new ideas in non-WIPM dark matter searches ...... 176 APS Fellows award ceremony ...... 177
CERN program and plans for the European Strategy ...... 177
Next European strategy process ...... 177
Asia particle physics program ...... 177
US Particle Physics Program ...... 177
DOE High Energy Physics Program and funding opportunities ...... 177
NSF Particle Physics Program ...... 177
New developments in the relation between quantum gravity and quantum information . 178
Developments in the theory of flavor mixing and new developments in FCNC decays . . 178
New experimental results and prospects on flavor physics ...... 178
Properties of the top quark and electroweak measurements ...... 178
Diversity and Inclusion ...... 178
Neutrino oscillations review ...... 178
Neutrino interactions – experimental and theoretical developments ...... 178
Neutrino mass and double beta decay ...... 179
How all neutrino measurements results fit together ...... 179
QCD studies at high and low energies ...... 179
Hot and cold QCD matter ...... 179
QCD theory developments ...... 179
“Dark sectors” and other novel types of new particles ...... 179
New models of elementary and composite Higgs bosons ...... 179
Cosmic Microwave Background ...... 180
Dark Energy Survey Year 1 Results ...... 180
DPF instrumentation award ...... 180
DPF mentoring award ...... 180
DPF Tanaka thesis award talk ...... 180
DPF Sakurai thesis award talk ...... 180
Education and Outreach ...... 180
Developments in accelerators for future high energy machines ...... 181
Future directions in particle physics software and computing ...... 181 Particle detectors developments ...... 181
Concluding remarks ...... 181
The ATLAS New Small Wheel Trigger ...... 181
Higgs-boson physics at the LHC: from discovery to precision physics...... 182
DOE PIs Meeting: HEP Civics ...... 182
R&D Toward Ton-Scale HPGXe Neutrinoless Double Beta Decay Experiments ...... 182
Broader Use of Simplified Limits on Resonances at the LHC ...... 183
Development of fast timing detectors at Fermilab ...... 183
HEP Civics ...... 183
Intensity Frontier ...... 183
Energy Frontier ...... 183
Cosmic Frontier ...... 184
QCD backgrounds to dark matter searches at the LHC ...... 184
Toward Next Snowmass ...... 184
Looking Forward to Dark Photons at the LHC ...... 184
Recent Developments in Lattice QCD ...... 185
Introduction ...... 185
Hadronic contributions to muon g-2 from lattice QCD ...... 185
New T2K Neutrino Oscillation Results ...... 185
Results from COHERENT ...... 186
Recent highlights from neutrino theory ...... 186
Site characterization for ground-based CMB observations with a 183GHz radiometer . . 186
Detector R&D ...... 187
DPF Instrumentation award ...... 187
2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Poster Session and Reception / 4
Gamow penetration factor for nuclear fusion reaction in quan- tum plasmas
Author: Young-Dae Jung1
Co-author: Myoung-Jae Lee 1
1 Hanyang University
Corresponding Author: [email protected]
The quantum shielding effects on the nuclear fusion reaction process are investigated inquantum plasmas. The closed expression of the classical turning point for the Gamow penetration factorin quantum plasmas is obtained by the Lambert W-function. The closed expressions of the Gamow penetration factor and the cross section for the nuclear fusion reaction in quantum plasmas are obtained as functions of the plasmon energy and the relative kinetic energy by using the effective interaction potential with the WKB analysis. It is shown that the influence of quantum screening suppresses the Sommerfeld reaction factor. It is also shown that the Gamow penetration factor increases with an increase of the plasmon energy. It is also shown that the quantum shielding effect enhances the deuterium formation by the proton-proton reaction in quantum plasmas. In addition, it is found that the energy dependences on the reaction cross section and the Gamow penetration factor are more significant in high plasmon-energy domains.
QCD / 5
Pion Polarizability at CERN COMPASS
Author: Murray Moinester1
1 Tel Aviv University
Corresponding Author: [email protected]
The pion polarizability is of fundamental interest in the low-energy sector of quantum chromody- namics. It is directly linked to the quark-gluon substructure and dynamics of the pion, the lightest bound system of the strong interaction. COMPASS measured the electromagnetic polarizability of the charged pion, which describes the stiffness of the pion against deformation in strong electromag- netic fields. Previous low statistics experiments in Serpukhov (Russia), where the Primakoff method for realizing interactions of charged pions with quasi-real photons was first employed. Later, other measurements based on photon-nucleon and photon-photon collisions were also carried out at dif- ferent laboratories. The COMPASS measurement demonstrates that the charged-pion polarizability is significantly smaller than previous results, roughly by a factor two, with the smallest uncertainties realized so far. The results are consistent with chiral perturbation theory predictions, and strength the identification of the pion with the Goldstone boson of the strong interaction. Strong interaction theory makes a precise prediction on the polarisability of pions – the degree to which their shape can be stretched. This polarizability has baffled scien- tists since the 1980s, when the first measurements appeared to be at odds with the theory. Today’s result is in close agreement with theory. The electric απ and magnetic βπ charged pion Compton polarizabilities provide stringent tests of Chiral Perturbation Theory. The combination (απ-βπ) was measured at CERN COMPASS via radiative pion Primakoff scattering (Bremsstrahlung of 190 GeV/c π-s) in the nuclear Coulomb field: π + Z → π + γ + Z. This reaction is identified experimentally by virtue of the very small momentum transfer to the target nucleus; and is equivalent to γ + π → γ + π Compton scattering for laboratory γ’s of order 1 GeV/c incident on a target pion at rest. COMPASS data analysis (assuming απ+βπ=0 based on theory) gives a value απ = -βπ = 2.0 ± 0.6(stat) ± 0.7(syst) × 10-4 fm3. This is the most precise measurement of this fundamental low-energy parameter ofstrong interaction that has been addressed since long by various methods with conflicting outcomes.This new measurement strengthens the identification of the pion with the Goldstone boson of strong interactions.
Page 1 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Quark and Lepton Flavor / 7
The Mu2e Experiment at Fermilab
Author: Yuri Oksuzian1
1 Univeristy of Virginia
Corresponding Author: [email protected]
Searching for Muon to electron conversion : The Mu2e experiment at Fermilab The Mu2e experiment will measure the charged-lepton flavor violating (CLFV) neutrino-less conver- sion of a negative muon into an electron in the field of a nucleus. The conversion process results ina monochromatic electron with an energy slightly below the muon rest mass (104.97 MeV). Mu2e will improve the previous measurement by four orders of magnitude using a new technique, reaching a SES (single event sensitivity) of 2.5 x 10ˆ{-17} on the conversion rate. The experiment will reach mass scales of nearly 10ˆ4 TeV, far beyond the direct reach of colliders. The experiment is sensitive to a wide range of new physics, complementing and extending other CLFV searches. Mu2e is under design and construction at the Muon Campus of Fermilab; we expect to start in 2020 with 3 years of running from 2021 to 2023.
Accelerators / 8
Novel Application of Density Estimation Techniques in Muon Ion- ization Cooling Experiment
Author: Tanaz Angelina Mohayai1 Co-authors: Chris Rogers 2; David Neuffer 3; Pavel Snopok 4
1 Illinois Institute of Technology 2 Rutherford Lab 3 Fermilab 4 IIT/Fermilab
Corresponding Author: [email protected]
The international Muon Ionization Cooling Experiment (MICE) is a high energy physics experiment located at Rutherford Appleton Laboratory in U.K. The aim of MICE is to demonstrate muon beam cooling for the first time. The process of reducing beam phase-space volume is known as beam cool- ing and this process is necessary for a beam of muons because of the large phase-space volume that they occupy upon production. Cooled muon beams are essential for future muon-based facilities such as neutrino factory or muon collider. Several beam cooling techniques exist, but the ioniza- tion cooling is the only technique fast enough to be used for muons within their short lifetime. In MICE, common figures of merit for beam cooling are the beam emittance and phase-space volume reductions, and phase-space density increase. Given the precision with which MICE aims to demon- strate beam cooling, it is necessary to take any beam effects which may lead to inaccurate cooling measurements into account. Non-linear effects in beam optics are examples of such effects andthey can result in beam heating. The Density Estimation (DE) techniques are analysis tools whichare insensitive to these non-linear effects and these techniques are used to measure the muon beam phase-space density and volume. This talk will give an overview of the recent MICE results andthe novel application of the density estimation techniques, in specific Kernel Density Estimation (KDE) in MICE.
Dark Matter / 9
Page 2 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Sommerfeld-Enhanced J-Factors For Dwarf Spheroidal Galaxies
Author: Jason Kumar1
Co-authors: Kimberly Boddy 1; Louis Strigari 2; Mei-Yu Wang 2
1 University of Hawaii 2 Texas A&M University
Corresponding Author: [email protected]
For models in which dark matter annihilation is Sommerfeld-enhanced, the annihilation cross sec- tion increases at low relative velocities. Dwarf spheroidal galaxies (dSphs) have low characteristic dark matter particle velocities and are thus ideal candidates to study such models. In this paper we model the dark matter phase space of dSphs as isotropic and spherically-symmetric, and determine the J-factors for several of the most important targets for indirect dark matter searches. For Navarro-Frenk-White density profiles, we quantify the scatter in the J-factor arising fromthe astrophysical uncertainty in the dark matter potential. We show that, in Sommerfeld-enhanced models, the ordering of the most promising dSphs may be different relative to the standard case of velocity-independent cross sections. This result can have important implications for derived upper limits on the annihilation cross section, or on possible signals, from dSphs.
Beyond Standard Model / 10
CompEx II: A Pathway in Search of BSM Physics using Compton Scattering
Author: Prajwal Mohanmurthy1
Co-authors: Dipangkar Dutta 2; Joseph Formaggio 1
1 Massachusetts Institute of Technology 2 Mississippi State University
Corresponding Author: [email protected]
Compton scattering has been shown to be very sensitive to the speed of light measured \emph{w.r.t.} to electrons in Compton scattering process [1]. For photons of energies in the range 9 − 46 MeV and a 1.16 GeV electron beam, a constraint on vacuum refractive index, (n − 1) < 1.4 × 10−8 was imposed using the Compton polarimeter at Hall - C of Jefferson Lab (JLab). Constancy and anisotropy of vacuum refractive index serves as a strong way to probe the predictions of theories beyond the standard model (BSM), especially those that predict breaking of local Lorentz and CPT symmetries. Absence of sidereal modulation of the vacuum refractive√ index was then used to con- strain the Minimal Standard Model Extension (MSME) parameters of κ2 + κ2 < 8.6 × 10−10 √( ) ( ) X Y − YZ 2 − ZX 2 × −10 and 2cTX (˜κ0+ + 2cTY (˜κ0+ < 8.6 10 [2]. These preliminary set of measure- ment above is being followed up by measurements using the 11.5 GeV electron beam at JLab which will improve the above constraints by two orders of magnitude. Also, the follow up measurement will allow us to probe the photon energy dependence of vacuum refractive index which provides for another means to test local Lorentz and CPT symmetries. Furthermore, quantum gravity models predict crystalline nature of space at Planck scales which may manifest as vacuum birefringence that can be probed by Compton scattering using circularly polarized light [3]. Measurements of vacuum birefringence at Planck scales may also be used to probe correlated holographic noise providing a glimpse into the quantum nature of space at its finest resolution. Efforts being made towards the realization of phase-2 of the series of Compton Experiments (CompEx) aimed towards probing the various aspects of BSM Physics models along with the results from phase-1 will be presented.
Page 3 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
QCD / 11
Mapping the QCD radiation spectrum
Author: Keith Pedersen1 Co-author: Zack Sullivan 1
1 Illinois Institute of Technology
Corresponding Author: [email protected]
Precision physics at the HL-LHC will require novel techniques to distinguish hard QCD from pileup and beam jets (e.g. the identification of hadronic W + decay for electroweak measurements or boosted top tagging). One scheme is to identify the signature of QCD radiation inside of jets. The high particle-multiplicity of LHC multijets permits fine-grained investigation of the QCD radiation spectrum via N-point correlation functions. But even with a relatively simple example – the Fox- Wolfram moments at an e+e− collider – high-frequency aliasing masks any useful information. We propose a general solution to suppress spectral leakage for any spatial correlation function.
QCD / 12
Are PDFs still consistent with Tevatron data?
Author: Zack Sullivan1
1 Illinois Institute of Technology
Corresponding Author: [email protected]
As active data taking has moved to the LHC at CERN, more and more LHC data have been included into fits of parton distribution functions. An anomaly has arisen where formerly excellent agreement between theoretical predictions and experiment in single-top-quark production at the Tevatron is no longer very good. Is this indicative of a deeper issue?
Beyond Standard Model / 13
The REDTOP experiment: Rare Eta Decays with a TPC for Optical Photons
Author: Corrado Gatto1 Co-author: Michael Syphers 2
1 INFN and NIU 2 Northern Illinois University / Fermilab
The η meson is almost unique in the particle universe since it is a Goldstone boson and the dynamics of its decay are strongly constrained. Because the eta has no charge, decays that violate conservation laws can occur without interfering with a corresponding current. The integrated eta meson samples collected in earlier experiments have been about ˜109 events, dominated by the WASA at Cosy experiment, limiting considerably the search for such rare decays. A new experiment, REDTOP, is being proposed at the proton booster of Fermilab with the intent of collecting more than 1013 triggers/year for studies of rare η decays.
Page 4 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Such statistics are sufficient for investigating several symmetry violations, and for searches for new particles beyond the Standard Model. The physics program, the accelerator systems and the detector for REDTOP will be discussed during the presentation.
Neutrino Physics / 14
Beyond Standard Model scales constrained by recent double beta decay experimental data
Author: Mihai Horoi1
1 Central Michigan University
Corresponding Author: [email protected]
Neutrinoless double-beta decay, if observed, would signal physics beyond the Standard Model (BSM). In particular, neutrinoless double-beta decay offers the possibility to test BSM theories that predict that neutrinos are Majorana fermions and that the lepton number con- servation is violated. We investigate the contribution of possible extensions to the Standard Model Lagrangian that could contribute to the neutrinoless double beta process, and we establish limits on the associated couplings. From these limits we extract limits on the energy scales for different terms contributing to the BSM effective Lagrangian, and we compare with those extracted from other data. Support from U.S. NSF grant PHY-1404442 and DOE grants DE-SC0008529 and DE-SC0015376 is acknowledged.
Quark and Lepton Flavor / 15
Lepton flavor violating meson decays
Authors: Alexey Petrov1; Derek Hazard2
1 Wayne State University / MCTP 2 Wayne State University
Corresponding Author: [email protected]
We argue that lepton flavor violating (LFV) decays M → ℓ1ℓ2 of quarkonium and heavy quark meson states M with different quantum numbers could be used to put constraints on theWilson coefficients of effective operators describing LFV interactions at low energy scales. We notethatthe restricted kinematics of the two-body decay of quarkonium or a heavy quark meson allows us to select operators with particular quantum numbers, significantly reducing the reliance on the single operator dominance assumption that is prevalent in constraining parameters of the effective LFV Lagrangian. We shall also argue that studies of radiative lepton flavor violating M → γℓ1ℓ2 decays could provide important complementary access to those effective operators.
Accelerators / 16
Measurement of Ionization Cooling With the MICE Experiment
Page 5 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Author: Yagmur Torun1
1 Illinois Institute of Technology
Corresponding Author: [email protected]
The international Muon Ionization Cooling Experiment (MICE) will demonstrate the ionization cool- ing of muons; the only known technique that can provide high brightness muon beams suitable for applications such as a Neutrino Factory or Muon Collider. MICE is underway at the Rutherford Ap- pleton Laboratory and has recently taken the data necessary to characterise the physical processes that underlie the ionization-cooling effect. Measurements of the underlying physics processes will be presented. Measurements of the change in normalised transverse emittance will be presented in a number of configurations. The measurements of the ionization-cooling effect will be discussed. The engineering demonstration of ionization cooling will be carried out by upgrading the present configuration with two 201 MHZ RF cavities and additional focusing elements. The statusofthe reconfiguration of the experiment will be presented together with a detailed evaluation oftheper- formance of the cooling demonstration itself.
Poster Session and Reception / 18
Investigation of Beam Emittance and Beam Transport Line Op- tics on Polarization
Author: Andrew Fiedler1 Co-author: Michael Syphers 2
1 Northern Illinois University 2 Northern Illinois University / Fermilab
Corresponding Author: [email protected]
Effects of beam emittance, energy spread, optical parameters and magnet misalignment onbeam polarization through particle transport systems are investigated. Particular emphasis will be placed on the beam lines being used at Fermilab for the development of the muon beam for the Muon g- 2 experiment, including comparisons with the natural polarization resulting from pion decay, and comments on the development of systematic correlations among phase space variables. This work was supported by the National Science Foundation Grant 1623691.
Poster Session and Reception / 19
Probing MeV Scale Physics in LArTPCs with Radioactive Calibra- tion Sources
Author: Jonathan Echevers1 Co-author: Bryce Littlejohn 2
1 University of Illinois at Urbana-Champaign 2 Illinois Institute of Technology
The Liquid Argon Time Projection chamber (LArTPC) is a unique technology well suited forlarge scale neutrino detectors. They allow for millimeter scale 3D precision particle tracking and calorime- dE try with good dx resolution, which provides excellent efficiency of particle identification and back- ground rejection. While studies of detector response to high energy events have begun, there has
Page 6 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
been little to no direct demonstration of LArTPCs’ capabilities in producing ground breaking physics with solar and supernovae low -energyneutrinos. We aim to facilitate the development of low -energy LArTPC capabilities by developing the first 1 -10MeV calibration subsystems for large LArTPCs. In this talk, I will introduce the properties of supernova neutrinos, discuss how they can be detected in LArTPCs, and overview the low-energy LArTPC calibration source conceptual designs we are developing.
Beyond Standard Model / 20
Search for evidence of Type-III seesaw mechanism in multilepton final states in pp collisions at 13 TeV
Author: Maximilian Heindl1
1 Rutgers University
Corresponding Author: maximilian.heindl@cern.ch
A search for a type-III seesaw signal in events with three or more electrons or muons is presented. The data sample corresponds to 35.9 fb−1 of integrated luminosity in pp collisions at 13 TeVcollected by the CMS experiment at the LHC in 2016. The signal is sought after in final states with atleast three leptons, and has diverse kinematic properties. The primary selection is based on the number of leptons and the invariant mass of opposite-sign lepton pairs, and helps discriminate the signal against the standard model background. The final optimization for the type-III seesaw signalis based on the sum of leptonic transverse momenta and missing transverse energy, as well as the transverse mass. The observations are consistent with expectations from standard model processes. The results are used to exclude heavy fermions of the type-III seesaw model with masses below850 GeV for the lepton-flavor democratic scenario.
Neutrino Physics / 21
Results from the MAJORANA DEMONSTRATOR
Author: Andrew Lopez1
1 University of Tennessee
Corresponding Author: [email protected]
Neutrino-less double beta decay searches are a promising method of determining currently unknown neutrino properties. The {\sc Majorana} Collaboration is constructing an ultra-low background mod- ular high-purity Ge detector array in order to search for neutrino-less double beta decay in 76Ge. The {\sc Demonstrator} detector assembly, located at the 4850-ft level of the Sanford Underground Research Facility, has the goal of showing that the background levels necessary for a tonne-scale experiment of similar design are achievable. The talk will include a short introduction to the ex- periment, as well as a discussion of achievements made in detector construction, data analysis, and simulations. With the completion of the shielding earlier this year, all of the detectors are in their final configuration. The current status of the {\sc Demonstrator} will be presented and futureplans will be discussed. This material is based upon work supported by the U.S. Department of Energy, Of- fice of Science, Office of Nuclear Physics, the Particle Astrophysics Program of the National Science Foundation, and the Sanford Underground Research Facility.
Higgs and EWSB / 26
Page 7 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Precision Higgs Measurements at the 250 GeV ILC
Author: Michael Peskin1
1 SLAC
Corresponding Author: [email protected]
The plan for the International Linear Collider is now being prepared as a staged design, withthe first stage at 250 GeV and later stages achieving the full project specifications with 4 ab-1 at500GeV. This talk will present the capabilities for precision Higgs boson measurements at 250 GeVandtheir relation to the full ILC program. It will show that the 250 GeV stage of ILC will already provide many compelling results in Higgs physics, with new measurements not available at LHC, model- independent determinations of key parameters, and tests for and possible discrimination of a variety of scenarios for new physics.
Dark Matter / 27
The Potential of the ILC for Discovering New Particles
Authors: Howard Baer1; Michael Peskin2
1 University of Oklahoma 2 SLAC
Corresponding Authors: [email protected], [email protected]
The LHC did not discover new particles beyond the Standard Model Higgs boson at 7 and 8TeV,orin the first data samples at 13 TeV. However, the complementary nature of physics with e+e- collisions still offers many interesting scenarios in which new particles can be discovered at the ILC.These scenarios take advantage of the capability of e+e- collisions to observe particles with missing energy and small mass differences, to observe mono-photon events with precisely controlled backgrounds, and to observe the full range of exotic decay modes of the Higgs boson. The searches that an e+e- collider makes possible are particularly important for models of dark matter involving a dark sector with particles of 10–100 GeV mass. In this talk, we will review the opportunities that the ILC offers for new particle discovery.
Top Quark Physics / 28
Toward Precision Top Quark Measurements in e+e- collisions
Author: Michael Peskin1
Co-author: Hitoshi Yamamoto 2
1 SLAC 2 Tohoku University
Corresponding Author: [email protected]
This talk will review new developments toward precision top quark measurements at e+e- colliders, including improvements in the experimental strategies for top quark pair production in the continuum, improvements in the precision theoretical understanding of this process, and sensitivity to new physics models. It will also update the study of the precision measurement of the t-tbar threshold.
Page 8 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Neutrino Physics / 29
Current Analysis Status for the Inclusive Neutral Current π0 Pro- duction Cross section Measurement with the NOvA Near Detec- tor
Author: Daisy Kalra1
Co-author: Giulia Brunetti 2
1 Student 2 Fermilab
Corresponding Author: [email protected]
NOvA (NuMI Off-axis νe Appearance) experiment is designed to study long-baseline neutrino oscilla- tions using two detectors, the Near Detector (ND) at Fermilab and the Far Detector (FD) at a distance 810 km in Northern Minnesota. NOvA looks for the νe appearance at the FD using a narrow band νμ beam peaked at 2 GeV in energy. Neutral Current (NC) interactions with a π0 in the final state represents the main background in the νe appearance measurement. The π0 decay into two photons can fake the νe appearance signal either due to merging of two photon showers or one of the two photons escaping the detection. Therefore, a complete understanding of νμ induced NC interactions with π0 in the final state is very important. It will also help in reducing the background uncertainties for current and future long-baseline neutrino oscillation experiments. We will present the current status of the analysis related to the inclusive NC π0 production cross section measurement with the NOvA ND.
Computing, Analysis Tools, and Data Handling / 30
Radiation-Hard/High-Speed VCSEL Array Driver ASIC for HL- LHC
Author: K.K. Gan1
1 The Ohio State University
Corresponding Author: [email protected]
The LHC has recently been upgraded to operate at higher energy and luminosity. In addition, there are plans for further upgrades. These upgrades require the optical links of the experiments to trans- mit data at much higher speed in a more intense radiation environment. We have designed a new optical transceiver for transmitting data at 10 Gb/s. The device consists of a 4-channel ASIC driving a VCSEL (Vertical Cavity Surface Emitting Laser) array in an optical package. The ASIC isdesigned using only core transistors in a 65 nm CMOS process to enhance the radiation-hardness. The ASIC contains an 8-bit DAC to control the bias and modulation currents of the individual channels in the VCSEL array. The DAC settings are stored in SEU (single event upset) tolerant registers. Several optical transceivers were irradiated with 24 GeV/c protons up to a dosage of 74 Mrad to study the radiation hardness of the high-speed optical links. The irradiated devices have been extensively characterized. The performance of the devices is satisfactory after the irradiation. We will presenta comparison of the performance of the devices before and after the irradiation.
Higgs and EWSB / 33
Search for production of a Higgs boson and a single top quark
Page 9 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Author: Ken Bloom1
1 University of Nebraska-Lincoln
Corresponding Author: [email protected]
We present recent results from searches for the production of a Higgs boson in association with a single top quark (tHq), using data samples collected by the CMS detector in pp collisions at center-of- mass energy of 13 TeV, using data samples with integrated luminosity of up to 35.9 fb-1. The searches exploit a variety of top quark and Higgs boson decay modes resulting in final states with photons, bottom quarks, or multileptons, and employ a variety of multivariate techniques to maximize the sensitivity to the signal. Due to interference between the two main leading-order diagrams, the tHq process is sensitive to the relative sign of the couplings of the Higgs to the top quark and the vector bosons, and thus provides unique information on Higgs boson properties.
Beyond Standard Model / 34
Search for supersymmetry in multijet events with missing trans- verse momentum in proton-proton collisions at 13 TeV
Author: Kevin Pedro1
1 Fermilab
Corresponding Author: [email protected]
A search for supersymmetry is presented based on multijet events with large missing transverse mo- mentum produced in proton-proton collisions at center-of-mass energy sqrt(s) = 13 TeV. The data, corresponding to an integrated luminosity of 35.9 fb-1, were collected with the CMS detector at the CERN LHC in 2016. The analysis utilizes four-dimensional exclusive search regions defined interms of the number of jets, the number of tagged bottom quark jets, the scalar sum of jet transverse mo- menta, and the magnitude of the vector sum of jet transverse momenta. No evidence for a significant excess of events is observed relative to the expectation from the standard model. Limits on the pair production of gluinos and squarks are derived in the context of simplified models. Assuming the lightest supersymmetric particle to be a weakly interacting neutralino, 95% confidence level lower limits on the gluino mass as large as 1800 to 1960 GeV are derived, and on the squark mass as large as 960 to 1390 GeV, depending on the production and decay scenario.
Beyond Standard Model / 35
Search for new physics with dijet angular distributions in proton- proton collisions at 13 TeV at CMS
Author: Jingyu Zhang1
1 University of Illinois Chicago
Corresponding Author: [email protected]
A search for√ new physics using measurements of dijet angular distributions in proton-proton col- lisions at s = 13˜TeV is presented. The data collected with the CMS detector at the CERNLHC correspond to an integrated luminosity of 36.5 fb−1. The distributions are unfolded for detector ef- fects and are compared with predictions from perturbative quantum chromodynamics that include electroweak corrections. Lower limits on various new physics models will also be discussed.
Page 10 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Beyond Standard Model / 36
Search for supersymmetry using boosted Higgs bosons and miss- ing transverse momentum in proton-proton collisions at 13 TeV
Author: Frank Jensen1
1 University of Colorado
CMS results at 8 and 13 TeV have placed bounds on gluino, squark, and electroweakino production in supersymmetric extensions to the Standard Model. The current sensitivity in some regions of phase space motivates more targeted searches. Depending on the mass spectra of the new particles, these models predict boosted objects, such as high pT vector bosons, in association with missing energy from sparticles escaping detection. A new analysis strategy using jet substructure techniques is ap- plied in hopes of enhancing sensitivity to models where a boosted object can be contained in a single large jet. We will describe an analysis looking for evidence of supersymmetry in events with miss- ing energy and boosted Higgs bosons (decaying to b-quarks) in the final state. We will compare our sensitivity to other analyses and describe the current limits on these production scenarios.
Beyond Standard Model / 37
Search for paired dijet resonances in the boosted and non-boosted regime with the CMS detector at 13 TeV
Author: Alejandro Gomez Espinosa1
1 Rutgers, The State University of New Jersey
Corresponding Author: [email protected]
We present a search for paired dijet resonances using data from proton-proton collisions at a center- of-mass energy of 13 TeV, recorded in 2016 by the CMS detector at the LHC. We exploit jet sub- structure techniques to reach low mass boosted paired dijet resonances, while for higher resonance masses we search for four jets in the final state. We consider the pair production of top squarks (stops) as the benchmark model, where each stop decays through the hadronic R-parity violating (RPV) coupling; in the case of the UDD312 coupling the stops decay into two light quarks and, for the UDD323 coupling the stops decay into a light quark and a b-quark.
Higgs and EWSB / 38
Inclusive search for boosted SM Higgs bosons using H to bb de- cays with the CMS detector at 13 TeV
Author: Javier Duarte1
1 Fermilab
Corresponding Author: [email protected]
We present an inclusive search for the standard model Higgs boson produced with high transverse momentum decaying to a bottom-antibottom quark pair using a data set of pp collisions at13TeV collected with the CMS experiment at the LHC in 2016. The data sample corresponds to an integrated luminosity of 35.9 inverse femotbarns. High-transverse-momentum Higgs bosons are reconstructed
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in a single jet with opening angle corresponding to R = 0.8. Jet substructure and dedicated b-tagging techniques are used to identify boosted H to bb.
Beyond Standard Model / 39
Search for Top-Anitop Quark Resonances in Boosted Semileptonic Final States in 13 TeV pp Collisions
Author: Douglas Berry1
1 University of Illinois at Chicago
Corresponding Author: [email protected]
A search for new heavy resonances decaying into top-antitop quark pairs is performed using proton- proton collisions at a center of mass energy of 13 TeV. The full dataset recorded in 2016 with theCMS detector corresponds to an integrated luminosity of 35.9 fbˆ{-1}. We consider only events containing one muon or one electron, at least two jets in the final state, and missing transverse energy. The analysis is optimized for events where the top quarks have a large Lorentz-boost resulting in highly collimated final state objects. The sensitivity of the search is improved by identifying jets originating from the top quark decay using jet substructure variables and by employing an MVA approach to reduce W+jets background.
Poster Session and Reception / 41
Testing data connections for use with the HL-LHC CMS forward pixel electronics
Authors: Alice bean1; Mario D. Balcazar2
1 Univ of Kansas 2 University of Kansas
Corresponding Author: [email protected]
For the CMS HL-LHC upgrade, a new Inner Tracker will be installed consisting of silicon pixel detector layers in the central region and disks placed in the forward region. A new readout chip will be used along with gigabit optical data links. Proposed designs for the readout chain electronics include a mix of high bandwidth electronic transmission cables and optical links. Until the new custom readout chips are available, a Xilinx Virtex-7 FPGA chip and prototype card will provide functional emulation for studies of the readout chain presented here.
Computing, Analysis Tools, and Data Handling / 42
CMS Software and Computing in LHC Run 2 (and Beyond)
Author: Kenneth Bloom1 Co-author: Matteo Cremonesi 2
1 Nebraska 2 FNAL
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Corresponding Author: [email protected]
The CMS experiment relies on the excellent performance of event reconstruction algorithms and timely processing of data and simulation samples for the prompt development of physics results. But the large trigger rates, complicated event environment and excellent performance of the LHC have posed many challenges for the CMS software and computing systems. We will describe recent developments in software and computing that have allowed physics results to be produced more efficiently, and look towards the even greater challenges that we will face in thefuture.
Beyond Standard Model / 43
SUSY searches using top quark tagging at CMS
Author: Nathaniel Pastika1
1 Baylor University
Corresponding Author: [email protected]
Results for searches for supersymmetry targeting top squarks and gluions will be presented in this talk. The analysis is optimized to specifically target top squark pair production and moregeneric supersymmetry signals with tops in the final state, including gluino pair production. These searches employ methods of tagging top quarks in the final state to reject standard model background in addition to traditional selection requirements such as missing transverse momentum. Due to the wide range of top quark transverse momentum and multiplicity produced in supersymmetric mod- els, custom algorithms which combine traditional boosted top tagging techniques with algorithms designed to reconstruct tops combining individual reconstructed jets were developed. The results, using 35.9 ifb of data collected by the CMS experiment, are interpreted using simplified modelsof supersymmetry to place limits on top squark and gluino production.
Beyond Standard Model / 44
Search for new resonances decaying into boosted W, Z and H bosons at CMS
Author: Caterina Vernieri1
1 Fermi National Accelerator Laboratory
Corresponding Authors: [email protected], [email protected]
This talk gives an overview of the searches for new heavy resonances decaying to standard model bosons at the TeV mass scale. Results are based on data corresponding to an integrated luminosity up to about 36 inverse femtobarns recorded in proton-proton collisions at s=13 TeV with the CMS detector at the CERN LHC. The bosons coming from the resonance decay can be W, Z, or the standard model Higgs. For very heavy resonances, bosons are produced with momentum considerably higher than their mass, modifying in a very appreciable way the event topology. The quarks originated from the hadronic decay of the SM bosons will be collimated into a smaller area such that they are clustered within a single large cone jet. Dedicated reconstruction techniques are used to distinguish the merged decay products of W, Z and H bosons produced with high transverse momentum, from jets that originate from single partons.
QCD / 45
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The proton radius puzzle
Author: Gil Paz1
1 Wayne State University
Corresponding Author: [email protected]
In 2010 the proton charge radius was extracted for the first time from muonic hydrogen, a bound state of a muon and a proton. The value obtained was five standard deviations away from the regular hydrogen extraction. Taken at face value, this might be an indication of a new force in nature cou- pling to muons, but not to electrons. It also forces to reexamine our understanding of the structure of the proton. In this talk I will describe an ongoing theoretical research effort that seeks to address and resolve this “proton radius puzzle”. In particular, I will present a reevaluation of the proton structure effects, correcting 40 years of such calculations, and the development of new effective field theoretical tools that would allow to directly connect muonic hydrogen and muon-proton scattering.
Particle Detectors / 46
Study of neutron-induced background hits in the CMS endcap muon system, and implications for the HL-LHC
Author: Christian Schnaible1
1 University of California, Los Angeles
Corresponding Author: [email protected]
Among the many challenges to be brought by the high luminosities of the HL-LHC is the impact of increased hit rates in the cathode strip chambers of the CMS endcap muon system. These chambers are used for all levels of trigger as well as offline reconstruction. Neutrons (both fast and ther- mal) induce background hits via nuclear interactions and capture, followed by gamma emission and (mainly) Compton scatter off electrons that subsequently ionize the chamber gas. This poster will describe recent efforts to improve the understanding of such neutron-induced background through detailed comparison of CMS pp collision data, GEANT4 simulation, and the response of CMS de- tectors placed in the CERN high-intensity gamma irradiation facility, GIF++. Projections for the effect of such neutron-induced background hits on trigger and reconstruction at the HL-LHCwill be described.
Higgs and EWSB / 47
Charged Higgs production with a W boson via b-quark annihila- tion
Author: Nikolaos Kidonakis1
1 Kennesaw State University
Corresponding Author: [email protected]
I present theoretical results for charged Higgs production in association with a W boson via bottom quark annihilation at the LHC. I calculate higher-order radiative corrections from collinear and soft gluon emission and show that they are very significant. I present results for total cross sections
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as well as transverse-momentum and rapidity distributions of the charged Higgs boson for various LHC energies.
Beyond Standard Model / 50
Search for light vector resonances decaying to a quark pair pro- duced in association with a jet with the CMS detector at 13 TeV
Author: Cristina Ana Mantilla Suarez1
1 Fermilab
Corresponding Author: [email protected]
We perform a search for light generic dijet resonances produced in association with a high trans- verse momentum jet to get above trigger thresholds. It uses novel jet substructure observables to identify the Z’ signal. The signal is then extracted on top of a falling QCD soft drop mass distribution estimated with a novel data-driven technique. Results are presented in a mass-coupling phase space and are the most sensitive to date, extending previous limits below 100 GeV.
Beyond Standard Model / 52
Nucleon Decay in Super-Kamiokande: Results and Prospects
Author: Gabriel Santucci1
1 Stony Brook University
Corresponding Author: [email protected]
The Standard Model of particle physics describes the strong and electroweak interactions among all known elementary particles. Despite its great success to explain many experimental results, it does not address the unification of these forces. Grand Unified Theories (GUTs) attempt to unifythese forces by embedding the SM group into a larger gauge group. Typical grand unification energies are far beyond the reach of accelerators. However, a common feature of GUTs is nucleon decay, generating baryon number violating processes. GUTs can be classified by the presence or absence of supersymmetry in the theory. Usually, innon- supersymmetric GUTs the gauge boson mediated mode where a proton decays into a positron and a neutral pion is preferred. However, in SUSY GUTs, another mode can become favored where the proton decays into an anti-neutrino and a charged Kaon. The Super-Kamiokande (SK) experiment is a 50-kton deep underground water Cherenkov detector located in Mt. Ikenoyama in Japan. This multi-purpose detector is able to search for many different nucleon decay modes including the two benchmark modes mentioned above and it has been doing so for more than 20 years. In this talk, I will present SK results on nucleon decay and describe a new approach to reconstruct the SUSY favored proton decay mode using a new reconstruction algorithm and how it can improve the sensitivity for this mode.
Beyond Standard Model / 54
Searches for new heavy resonances in final states with leptons, photons, and jets in CMS
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Author: Norbert Neumeister1
1 Purdue University
Corresponding Author: [email protected]
Many new physics models beyond the Standard Model predict the existence of narrow or broad resonances decaying to a pair of quarks/gluons, leptons, or photons. At the LHC, the production of heavy resonances decaying into a pair of particles can be probed at unprecedented centre-of-mass energies. This talk presents CMS searches for new resonances in the diet, dilepton, diphoton, and other final states that include leptons and photons, focusing on the recent results obtained using data collected during the 2016 run.
QCD / 55
Jet Energy Scale and Resolution Measurements at CMS
Author: Bahareh Roozbahani1 Co-authors: Charles Harrington 2; Ia Iashvili 2
1 suny Buffalo 2 SUNY Buffalo
Corresponding Author: [email protected]
We present measurements of CMS jet energy scale (JES) corrections, based on a data sample collected in proton-proton collisions at a center-of-mass energy of 13 TeV. The corrections are extracted from the data and simulated events using a combination of several physics channels and methods, and these successively account for the effects of pileup, dependencies of response of jets on transverse momenta and pseudorapidity, and differences in response measured in data and MC. The jetenergy resolution is measured in data and simulated events, and it is studied as a function of pileup. The studies exploit the events with dijet topology, photon+jets, Z+jets and multijet events.
Beyond Standard Model / 56
Searches for new resonances decaying into diboson final states with large missing transverse momentum
Author: Yanchu Wang1 Co-author: Bob Hirosky 2
1 University of Virginia 2 Virginia
Corresponding Author: [email protected]
We report on searches for new heavy resonances decaying to a pair of standard model (SM) bosons where the final states contain significant missing energy due to the presence of undetected neutri- nos. The results are based on data collected by the CMS detector at the CERN LHC corresponding to approximately 36 inverse femtobarns of proton-proton collisions at sqrt{s}=13 TeV and extend pre- vious experimental sensitivities to regimes with smaller coupling to SM particles and higher ranges in TeV mass scales. These channels can offer increased event yields compared to those willfully visible final states. However due to the presence of undetected neutrinos it is not possible tofully reconstruct the properties of such events. We discuss strategies used to improve sensitivities and background rejection and compare results with related analyses using alternative channels.
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Higgs and EWSB / 57
Search for SM Higgs Boson in the H->tautau->mumu decay mode with the CMS experiment at 13TeV
Author: Vallary Bhopatkar1
1 Florida institute of Technology
Corresponding Author: [email protected]
A search for standard model (SM) Higgs bosons decaying into pairs of tau leptons and then to two muons plus (anti)-neutrinos are presented. The analysis is performed using data collected bythe CMS detector in 2016 with 35.9 fb−1 of integrated luminosity. This channel has been studied in three event categories with different jet multiplicities focusing on Higgs boson signal events produced via gluon-gluon fusion and vector boson fusion. A multivariate analysis with boosted decision trees (BDT) is used to suppress the large Drell-Yan background. The di-tau mass is reconstructed using a secondary-vertex fit (SVFit) algorithm using a maximum likelihood approach. Experimental limits are presented in all three categories extracted from two-dimensional maximum likelihood fit in the plane of reconstructed di-tau mass and BDT response.
Top Quark Physics / 58
Measurement of the tt¯ spin correlations and top quark polariza- tion in dileptonic channel
Author: Ajeeta Khatiwada1
1 Purdue University
Corresponding Author: [email protected]
The degree of top polarization and strength of tt¯correlation are dependent on production dynamics, decay mechanism, and choice of the observables. At the LHC, measurement of the top polarization and spin correlations in tt¯production is possible through various observables related to the angular distribution of decay leptons. A measurement of differential distribution provides a precision test of the standard model of particle physics and probes for deviations, which could be a sign of new physics. In particular, the phase space for the super-symmetric partner of the top quark can be constrained. We present updates to the recent top quark polarization and spin correlation studies in dileptonic channel at the Compact Muon Solenoid experiment.
QCD / 61
PDF Flavor Determination with LHC W/Z production
Author: Fredrick Olness1
1 SMU
Corresponding Author: [email protected]
We use nCTEQ15 nPDFs with uncertainties to identify measurements which have a potential impact on nuclear corrections and flavor differentiation. In particular, recent LHC W/Z vector boson production data in proton-lead and lead-lead collisions are quite sensitive to
Page 17 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
heavier flavors (especially the strange PDF). This complements the information from neutrino-DIS data. As the proton flavor determination is dependent on nuclear corrections (from heavy target DIS, for example), this information can also help improve proton PDFs.
Particle Detectors / 62
Plans for the Upgrade of the CMS Barrel Electromagnetic Calorime- ter
Author: Brad Cox1
1 University of Virginia
Corresponding Author: [email protected]
The electromagnetic calorimeter (ECAL) of the Compact Muon Solenoid Experiment (CMS) isop- erating at the Large Hadron Collider (LHC) with proton-proton collisions at 13 TeV center-of-mass energy and at a bunch spacing of 25 ns. Challenging running conditions for CMS are expected after the high-luminosity upgrade of the LHC (HL-LHC). Particular challenges at the HL-LHC are the harsh radiation environment, an increase in data rate (by a factor of 2 to 5) and the extreme level of pile-up events, with up to 200 simultaneous proton-proton collisions. We review the options for the upgrade of the barrel ECAL, including evaluations of the predicted longevity up to an integrated luminosity of 3000/fb. We also discuss the anticipated improvements to the electronics, which must be upgraded due to the increased trigger and latency requirements at the HL-LHC.
Beyond Standard Model / 63
Search for vector-like quarks with oppositely-charged dilepton pairs, jets, and missing transverse energy in proton-proton colli- sions at centre-of-mass energy of 13 TeV
Author: Rachitha Mendis1
1 Kansas State University
Corresponding Author: [email protected]
We Present results of the search for pair produced Vector-like T quark using the proton-proton Collison data collected by the CMS experiment in 2016 with integrated luminosity of 35.9 /fb at a centre-of-mass energy of 13 TeV . Vector-like quarks appear in several extensions of the standard model, and can cancel the diverging loop corrections to the Higgs mass, and thus stabilize it at the electroweak scale.The T quark can decay in to either of three states, bW, tZ of tH. Thepair produced T final state consists of two oppositely charged electrons or muons consistent withdecay products from Z boson, jets and MET. We set limits on mass of the T quark for various branching ratios.
QCD / 64
Regge Trajectories of triply heavy baryons
Author: Zalak Shah1
Page 18 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Co-author: Ajaykumar Rai 2
1 PhD student 2 Assistant Professor
Corresponding Authors: [email protected], [email protected]
Ωccc, Ωbbb, Ωccb and Ωbbc baryons are considerable theoretical interest in a baryonic analogue of heavy quarkonium because of the color-singlet bound state of three heavy quark (c,b) combina- tion inside ({\it free from light quarks}) \cite{olive}. Regge trajectories are concerned with the mass spectrum of the particles so that the present study exhibits the regge trajectories obtained from excited states of four experimentally unknown triply heavy Ω baryons. The trajectories are plot- ted in (n, M 2) and (J, M 2) planes which is helpful to determine the unknown quantum number and J P values. The calculations have computed in Hypercentral Constituent Quark Model with hyper coulomb plus linear potential \cite{EPJC}. Many author have also study the mass spectra by different approaches\cite{brown, PAD2014, vijande2015, kwei2}. However, LHCb experiment pos- ∗ sibly detect Ωbbb, Ωbbc and Ωbbc baryons at appropriate integrated luminosity and collision energy \cite{lhcb}. \begin{thebibliography}{90} \bibitem{olive}{C. Patrignani et. al., Chin. Phys. C \textbf{40}, 100001 (2016)}. \bibitem{kwei2}K-W Wei, B. Chen and X-H Guo, Phys. Rev. D \textbf{92}, 076008 (2015). \bibitem{EPJC}Z. Shah, K. Thakkar and A. K. Rai, Eur. Phys. J. C {\bf76}, 530 (2016); Eur. Phys.J.C {\bf77}, 129 (2017);Chin. Phys. C \textbf{40}, 123102 (2016). \bibitem{brown}Z. S. Brown, W. Detmold, S. Meinel, and K. Orginos, Phys. Rev. D \textbf{90}, 094507 (2014) \bibitem{PAD2014} M. Padmanath, R. G. Edwards, N. Mathur, and M. Peardon, Phys. Rev. D \textbf{90}, 074504 (2014) \bibitem{vijande2015} J. Vijande, A. Valcarce and H. Garcilazo, Phys. Rev. D \textbf{91}, 054011 (2015). \bibitem{lhcb}S.-Z. Wu, Y.-W. Li and R. Rashidin, Phys. Rev. D {\bf 86}, 114504 (2012) \end{thebibliography}
Accelerators / 65
CEPC R&D and key technologies
Author: YUNLONG CHI1
1 Institute of High Energy Physics, Chinese Academy of Sciences
Corresponding Author: [email protected]
CEPC is a 100 km circular electron-positron collider operating at 90-240 GeV center-of-mass energy of Z-pole, WW pair production threshold, and Higgs resonance. CEPC and its successor SPPC, a 100 TeV center-of-mass super proton-proton collider, will ensure the elementary particle physics a vibrant field for decades to come. To reduce the overall cost, partial double ring scheme was proposed as the alternative, which has a significant impact on the cavity operation and beam dynamics. The conceptual design report (CDR) of CEPC will be completed by the end of 2017 as an important step to move the project forward. In this presentation, the progress of CEPC accelerator key technology R&D status will be shown, including SRF system, High efficiency klystron etc.
Beyond Standard Model / 66
One-loop effects on Z boson decays in the SMEFT
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Author: William Shepherd1
1 JGU Mainz
Corresponding Author: [email protected]
I will present partial one-loop corrections to SM EFT parameterizations of new physics effects on Z boson decays, and discuss the impact of LEP I data on SM EFT fits. The findings indicate that any measurement which reaches percent-level sensitivity to new physics effects in Z decays, like the pre- cise LEP data, cannot be consistently used at higher precision to reach fixed conclusions on Wilson coefficients, as too many operators contribute at loop level which are currently not constrained ina consistent EFT treatment. This work motivates further effort in understanding the correct treatment of high energy, non-resonant data in an EFT context.
Beyond Standard Model / 67
Searches for electroweakly produced supersymmetry with CMS
Author: Basil Schneider1
1 FNAL
Corresponding Author: [email protected]
In supersymmetry, most solutions to the hierarchy problem feature light higgsinos, since it is the most important ingredient to stabilize the Standard Model higgs mass. Light higgsinos, however, are notoriously difficult to detect. This talk will outline the challenges of finding higgsinos and present various search results and techniques, that focus on supersymmetric models where colored sparticles are out of reach at the LHC and electroweakino production is the dominant process beyond the Standard Model. The searches are performed on data corresponding to an integrated luminosity of 36 fb-1 and a center of mass energy of 13 TeV, recorded with the CMS detector at theCERNLHC in 2016.
Neutrino Physics / 68
Muon Neutrino Dissapearance in the NOvA experiment
Author: Diana Patricia Mendez1
1 University of Sussex
NOvA is a long-baseline neutrino oscillation experiment looking for muon neutrino disappearance and electron neutrino appearance. Having the longest baseline of any past or present accelerator experiment, NOvA uses the upgraded Neutrino Main Injector (NuMI) beam at Fermilab. The exper- iment measures oscillations within a muon neutrino beam using a 300 ton Near Detector and a 14 kiloton Far Detector placed 810 km away from each other, both located 14 milliradians off-axis. The energy spectra observed in this neutrino beam peaks at 2 GeV close to the oscillation maximum. NOvA being an oscillation experiment uses the Near Detector (ND) at Fermilab to measure the ini- tial beam spectra and flavour composition. Then the spectra is extrapolated to the Far Detector (FD) at Ash River to search for oscillations.
The NOvA Collaboration has updated its first analysis and has recently released anew νµ disap- pearance result using an exposure of 6 × 1020 protons-on-traget (POT). Our just-published result disfavours the symmetric mixing scenario (θ23 = π/4) at 2.6 sigma significance, well beyond that of 20 past results. By the end of February 2017, NOvA had been exposed to 9 × 10 POT for a νµ beam
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2 which will allow us to better constrain the allowed regions for the oscillation parameters ∆m32 2 and sin θ23. Furthermore, the Disappearance Analysis Group has been pushing to increase its sen- sitivity, coming from a finner energy binning and hadronic energy fractions. These improvements are underway and waiting to be tested with real data once the reconstruction is done and ready by the beginning of Summer 2017. This talk will discuss the improvements to the muon neutrino disappearance analysis and how our sensitivity to non-maximal mixing can be improved.
Beyond Standard Model / 69
Searches for Heavy Resonances Decaying to a W or Z Boson and a Higgs Boson with the ATLAS experiment
Author: Ines Ochoa1
1 Columbia University
Corresponding Author: [email protected]
The discovery of the Higgs boson by the ATLAS and CMS experiments at the LHC has ledtoanew set of questions regarding the completeness of the Standard Model (SM). Many different theoretical scenarios have been proposed to alleviate the fine-tuning of the SM required by the measured value of the Higgs boson mass by introducing new physics at the TeV scale, within reach of the LHC. Many of these scenarios incorporate new heavy vector bosons, a neutral Z′ and two charged W ′±, that can be expected to couple to the SM bosons. Final states composed of a Higgs and a vector boson are therefore potential windows to new heavy resonances with TeV masses. In such kinematic regimes, one can take advantage of the large branching ratio of the Higgs boson to b¯b, employing jet sub- structure and b-tagging techniques as discovery tools. In this presentation, the latest search results from the ATLAS experiment√ are shown, targeting WH and ZH final states. The full 2015+2016 LHC proton-proton dataset at s = 13 TeV is used.
Beyond Standard Model / 70
Search for pair production of Higgs bosons in the b¯bb¯b final state with the ATLAS experiment
Author: Tony Tong1
1 Harvard University
Corresponding Author: [email protected]
An enhanced production of double Higgs bosons would be a clear sign of beyond Standard Model physics. A search is performed for resonant and non-resonant excess production, where the two Higgs bosons both decay to a pair of bottom quarks. The analyses use up to36fb−1 of p-p collision data collected by the ATLAS detector at 13 TeV.
Accelerators / 71
Bunched beam cooling for hadron colliders
Author: Valeri Lebedev1 Co-author: Sergei Nagaitsev 2
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1 Fermilab 2 FNAL
Corresponding Authors: [email protected], [email protected]
The paper discusses cons and pros of different cooling methods for cooling of bunches at thecollision energy in a hadron collider. Possible applications and ultimate possibilities for stochastic cooling, coherent electron cooling, optical stochastic cooling and electron cooling are considered.
Top Quark Physics / 72
Top-pair and tW production at approximate Nˆ3LO
Author: Nikolaos Kidonakis1
1 Kennesaw State University
Corresponding Author: [email protected]
I present approximate Nˆ3LO theoretical results for top-antitop pair production and for single-top production in association with a W boson. The higher-order corrections are from soft-gluon radia- tion which is dominant near partonic threshold. I present results for total cross sections as well as transverse-momentum and rapidity distributions of the top quark and compare with data at LHC energies.
Beyond Standard Model / 73
Search for Dark Matter in Jets plus MET final state for Non-thermal Dark Matter, Fermion Portal and ADD models using data from Proton-Proton Collisions at √s = 13 TeV.
Author: Sonaina Undleeb1
1 Texas Tech University
Corresponding Author: [email protected]
We will present a search for dark matter in events with one or more jets and large missing transverse energy using proton-proton collisions at center-of-mass energy of 13 TeV. The data was collected in 2016 by the CMS detector at the LHC correspond to an integrated luminosity of 35.9 fb-1. The results are interpreted in terms of well known LED ADD model and new models, Fermion Portal and Non- thermal dark matter.
Beyond Standard Model / 74
Search for 3rd generation superpartners with the ATLAS experi- ment
Author: Keisuke Yoshihara1
1 University of Pennsylvania
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Corresponding Author: [email protected]
Two of the most important parameters in supersymmetry are the masses of the stop and sbottom, the supersymmetric partners of the third generation quarks. A stop mass lighter than 1 TeV is favored in theory, however experimental evidence for a light stop has not been indicated from the various searches at the LHC so far. Therefore, it is very important to extend the searches to various pMSSM models with different mass splittings between the stop, neutralino(s), and chargino(s). Recent ATLAS results from searches for direct stop (sbottom) pair production are presented in final states√ with jets, missing transverse momentum, and leptons. The analyses are based on 36fb−1 of s =13 TeV proton-proton collision data recorded with ATLAS detector at the LHC in 2015 and 2016.
Poster Session and Reception / 75
Real time trigger rate monitoring at CMS
Author: Charles Mueller1
1 University of Notre Dame
Corresponding Author: [email protected]
Throughout Run II, the trigger rate monitoring tool used by CMS has helped identify problems throughout the detector, leading to faster diagnosis and correction thanks to real time monitoring and alarms. This tool also incorporates trigger rates into CMS data certification. An overview ofthis tool is presented.
Beyond Standard Model / 76
A search for charged Higgs bosons with the ATLAS experiment
Author: Blake Burghgrave1
1 Northern Illinois University
The experimental observation of charged Higgs bosons, whose existence is predicted by several models with an extended Higgs sector, would be an unambiguous signal for physics beyond the Standard Model (SM). We present the results from a search for charged Higgs bosons in 36/fb of pp collision data at 13 TeV recorded by the ATLAS experiment at the Large Hadron Collider. The search focuses on production of a charged Higgs boson in association with a top quark, followed by decay of the charged Higgs to a tau lepton and the associated neutrino, while the top quark decays to a W boson and a b quark. We consider hadronic decays of the tau from the charged Higgs, and include both leptonic (into an e or a mu and the associated neutrino) or hadronic (quark-antiquark) decays of the W. Results from the two channels, dubbed tau+lep and tau+jets, respectively, are combined. We place upper limits on the rates of the process (i.e. on the production cross section of charged Higgs boson times its branching fraction into tau+nu) over the mass range of 90 GeV < m(H+) < 2 TeV.
Particle Detectors / 78
Microhexcavity Plasma Panel Detectors
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Authors: Alexis Mulski1; Daniel S. Levin2 Co-authors: Achintya Das 3; Claudio Ferretti 2; David Reikher 3; Erez Etzion 4; John W. Chapman 2; Meny Raviv- Moshe 3; Michael D. Ausilio 2; Nicholas Ristow 2; Peter S. Friedman 5; Ralf Bejko 2; Yan Benhamou 3
1 University of Michigan 2 University of Michigan Department of Physics 3 Tel Aviv University School of Physics and Astronomy 4 CERN 5 Integrated Sensors, LLC
Corresponding Author: [email protected]
Plasma panel detectors are a variant of micropattern detectors that are sensitive to ionizing radiation. They are motivated by the design and operation of plasma display panels. The detectors consist of arrays of electrically and optically isolated pixels defined by metallized cavities embedded in a dielectric substrate. These are hermetically sealed gaseous detectors that use exclusively non- hydrocarbon gas mixtures. The newest variant of these “closed-architecture” detectors is knownas the Microhexcavity plasma panel detector (µH-PPS), consisting of 2 mm wide, regular close-packed hexagonal pixels each with a circular thin-film anode. The fabrication, staging, and operation of these detectors is described. Initial tests with the µH-PPS detectors operated in Geiger mode yield Volt-level signals in the presence of ionizing radiation. The spontaneous discharge rate in the absence of a source is roughly 2-3 orders of magnitude lower compared to the rates measured using low energy betas.
Dark Matter / 79
ADMX - axion dark matter experiment
Author: William Wester1
1 Fermilab
Corresponding Authors: [email protected], [email protected]
The ADMX experiment is now taking data that is sensitive for the first time to a possible QCDaxion with couplings to photons that can provide a solution to the strong-CP problem and account for a sizable amount of the dark matter of the universe.
Particle Detectors / 80
The LUCID-2 detector
Author: Pinfold James1
1 University of ALberta
Corresponding Author: [email protected]
The LUCID-2 detector is the main online and offline luminosity provider of the ATLAS experiment. It provides over 100 different luminosity measurements from different algorithms for each ofthe 2808 LHC bunches. LUCID was entirely redesigned in preparation for LHC Run 2: both the detector and the electronics were upgraded in order to cope with the challenging conditions expected at the LHC center of mass energy of 13 TeV with only 25 ns bunch-spacing. While LUCID-1 used gas as a Cherenkov medium, the LUCID-2 detector is in a new unique way using the quartz windows of small photomultipliers as the Cherenkov medium. The main challenge for a luminometer is to keep the
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efficiency constant during years of data-taking. LUCID-2 is using an innovative calibration system based on radioactive 207 Bi sources deposited on the quartz window of the readout photomultipliers. This makes it possible to accurately monitor and control the gain of the photomultipliers sothatthe detector efficiency can be kept stable at a percent level. A description of the detector and itsreadout electronics will be given, as well as preliminary results on the ATLAS luminosity measurement and related systematic uncertainties.
Beyond Standard Model / 81
Search for pair production of vector-like quarks in final states with a boosted W boson and b-jet with the ATLAS experiment
Author: Joseph Haley1
1 Oklahoma State University
Corresponding Author: [email protected]
This talk will present a search for the pair production of heavy vector-like T and B quarks, primarily targeting√ T quark decays to a W boson and a b quark. The search is based on 36fb−1 of pp collisions at s = 13 TeV recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. Data are analyzed in the lepton plus jets final state, including at least one b-tagged jet and a large-radius jet identified as originating from the hadronic decay of a high-momentum W boson.
Particle Detectors / 82
Ultra long-lived particles searches with MATHUSLA
Author: Gordon Watts1
1 University of Washington
Corresponding Author: [email protected]
Many extensions of the Standard Model (SM) include particles that are neutral, weakly coupled, and long-lived that can decay to final states containing several hadronic jets. Long-lived particles (LLPs) can be detected as displaced decays from the interaction point, or missing energy if they escape. ATLAS and CMS have performed searches at the LHC and significant limits have been set in recent years. However, the current searches performed at colliders have limitations. A LLP does not interact with the detector and it is only visible once it decays. Unfortunately, no existing or proposed search strategy will be able to observe the decay of non-hadronic electrically neutral LLPs with masses above ˜ GeV and lifetimes near the limit set by Big Bang Nucleosynthesis (cτ ˜ 107-108 m). Therefore, ultra-long-lived particles (ULLPs) produced at the LHC will escape the main detector with extremely high probability. In this talk we describe the concept of the MATHUSLA surface detector (MAssive Timing Hodoscope for Ultra Stable neutraL pArticles), which can be implemented with existing technology and in time for the high luminosity LHC upgrade to find such ultra-long-lived particles, whether produced in exotic Higgs decays or more general production modes. The MATHUSLA detector will consist of resistive plate chambers (RPC) and scintillators with a total sensitive area of 200x200 m square. It will be installed on the surface, close to the ATLAS or CMS detectors. A small-scale test detector (˜ 6 m square) is going to be installed on the surface above ATLAS in June 2017. It will consist of three layers of RPCs used for tracking and two layers of scintillators for timing measurements. It will be placed above the ATLAS interaction point to estimate cosmic backgrounds and proton-proton backgrounds coming from ATLAS during nominal LHC operations.
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We will report on the status of the test detector, on the on-going background studies, and plans for the main detector.
Computing, Analysis Tools, and Data Handling / 83
Operation and Performance of the ATLAS Level-1 Calorimeter and Level-1 Topological Triggers in Run 2 at the LHC
Author: Kate Whalen1
1 University of Oregon
Corresponding Author: [email protected]
In Run 2 at CERN’s Large Hadron Collider, the ATLAS detector uses a two-level trigger system to reduce the event rate from the nominal collision rate of 40 MHz to the event storage rate of 1 kHz, while preserving interesting physics events. The first step of the trigger system, Level-1, reduces the event rate to 100 kHz with a latency of less than 2.5 μs. One component of this system is the Level-1 Calorimeter Trigger (L1Calo), which uses coarse-granularity information from the electromagnetic and hadronic calorimeters to identify regions of interest corresponding to electrons, photons, taus, jets, and large amounts of transverse energy and missing transverse energy. In this talk, we will dis- cuss the improved performance of the L1Calo system in the challenging, high-luminosity conditions provided by the LHC in Run 2. As the LHC exceeds its design luminosity, it is becoming even more critical to reduce event rates while preserving physics. A new feature of the ATLAS trigger system for Run 2 is the Level-1 Topo- logical Trigger (L1Topo), which uses four FPGAs to process information from the L1Calo and Level-1 Muon trigger systems, performing kinematic and angular selections with a latency of 200 ns. The physics motivation for L1Topo, as well as its implementation and performance in the ATLAS trigger system in Run 2, will be discussed.
Poster Session and Reception / 84
Shower reconstruction performance studies for DUNE far detec- tor
Author: Reddy Pratap Gandrajula1 Co-author: On behalf of , 2
1 Michigan State University 2 DUNE Collaboration
Corresponding Author: [email protected]
Two of the flagship analyses at the DUNE far detector are to determine the neutrino mass hierarchy and to measure the CP violating phase, using the appearance of electron-neutrino signal events in the far detector. To efficiently select signal events, we require robust shower reconstruction tools to achieve the maximal electron/photon separation. We present a summary of existing shower re- construction algorithms, and their efficiency and performance by calculating the shower purity and completeness, as well as the dE/dX distributions for electron and photon showers. We also explore possible areas of improvements for the electron shower reconstruction for better electron-neutrino signal reconstruction.
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Beyond Standard Model / 85
Search for diphoton high-mass resonances with 36.7 fb−1 of data collected at √ s=13 TeV with the ATLAS experiment
Author: Manuel Silva1
1 University of Wisconsin, Madison
Corresponding Author: [email protected]
A search for heavy resonances decaying into two photons in the ATLAS experiment is presented. The analysis uses proton-proton collision data accumulated at the Large Hadron Collider during2015 and 2016 with a corresponding luminosity of 36.7 fbˆ{-1} at 13 TeV. Two searches are shown, a search for spin-0 particles using a heavy Higgs-like particle as a benchmark model, and a search for spin-2 particles using a Randall-Sundrum graviton as a benchmark model. Limits on the production cross section times branching ratio to two photons for the two resonance types are reported.
Beyond Standard Model / 88
± − Search for high-mass Zγ and√ W γ resonances using 36 fb 1 of data from pp collisions at s = 13 TeV with the ATLAS experi- ment
Author: Wei Tang1
Co-author: Al Goshaw 1
1 Duke University
Corresponding Author: [email protected]
Results are presented from searches for massive boson resonances with decay modes X → Zγ and X± → W ±γ using 13 TeV proton-proton collision data collected by the ATLAS detector at the LHC in 2015 and 2016. For the Zγ channel, a high ET lepton trigger selects events where the Z boson is detected from decays to e+e− and µ+µ−. These data are used to search for resonances with mass between 250 GeV and 2.4 TeV. The search is extended to higher X mass inthe X → Zγ and X± → ± W γ channels using hadronic decays of the W/Z bosons. The events are selected using a high ET photon trigger with a boosted Z/W boson reconstructed from merged di-jet clusters in a large radius jet. The data are used to search for resonances X → Zγ with spins 0 and 2 and X± → W ±γ with spin 1.
Higgs and EWSB / 89
Combined measurements of the Higgs boson production and de- cay rates using pp collisions at √s = 13 TeV with the ATLAS Ex- periment
Author: Hongtao Yang1
1 University of Wisconsin-Madison
Corresponding Author: [email protected]
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After the Higgs boson was discovered at the LHC in 2012, it is of great importance tostudyhow the Higgs boson interacts with Standard Model particles. In this presentation, I will report on the combined measurements of Higgs boson production and decay rates using LHC Run 2 proton-proton collision data collected at the center-of-mass energy of 13 TeV by the ATLAS detector in 2015 and 2016. The combination is based on the analysis of five production processes, namely gluon fusion, vector boson fusion, and associated production with a W or a Z boson or a pair of top quarks, and of multiple decay modes. I will also discuss how the measurements constrain the Higgs boson’s couplings to Standard Model particles as well as the existence of new physics.
Diversity, Education, and Outreach / 90
Science writing workshops with the ATLAS experiment
Author: Tasneem Zehra Husain1 Co-author: Isabel Trigger 2
1 Author and Science Educator 2 TRIUMF
Particle physics is fascinating to an overwhelming majority of the population but is shrouded in mystery.. Our theories appear abstruse and abstract, our experiments are specialized and technical; there is a barrier - both literal and metaphorical - that keeps the uninitiated out. As practicing scientists, we are often called upon to explain our work: to spread awareness, to educate, to justify the expenditure of public funds, or to counter an increasingly troubling suspicion of science. But the dispassionate, objective, disembodied voice we have been trained to use in our professional lives, doesn’t work very well with the public. In order to communicate meaningfully with a more general audience, we must start from a point of connection and keep referring back to the things we have in common - the human experiences and emotions we all share; we must risk being subjective and personal, be willing to talk about the messy, creative aspects of science and the passion that animates our work. This talk will describe workshops organized in 2016 and 2017 by the ATLAS collaboration with author Tasneem Zehra Husain, to help scientists rediscover their unique writing voice and learn how to craft stories in a manner that will resonate with a lay audience.
Poster Session and Reception / 91
The Cosmological Principle Breaks Down as Superstructures Grow in the Universe
Author: Cameron Marshall1 Co-author: Jeremy Marshall 2
1 Manhattan High School & Kansas State University 2 Kansas State University
Corresponding Author: [email protected]
Humanity’s cosmic physics relies on the assumption that, “the Universe looks the same for all ob- servers, regardless of location.” This assumption is called the Cosmological Principle, which isde- fined by the properties of homogeneity and isotropy. Homogeneity states that, the Universe looks the same at each point, while isotropy states that the Universe looks the same in all directions. While it is known that the cosmological principle breaks down at smaller cosmic scales (e.g., clusters of galaxies and solar systems), most research suggests that it holds at larger scales where clusters of
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galaxies are simply dots on the cosmic landscape. However, we now know that galaxies are not randomly distributed throughout the Universe. Greater than 90% of galaxies are located in dense areas of dark matter, where dark matter has condensed to form a cosmic web across the Universe. This cosmic, dark matter web is not static, but is continuing to condense, with “branches” inthe web merging to become thicker “superstructures” over time. These findings suggest that the Cosmo- logical Principle will eventually break down at all scales. The questions, then, are (1) at what scale does the Cosmological Principle fail now and (2) when will the largest scales of the Universe look like this current, “failed” scale? Using a database from The Max Planck Institute for Astrophysics, the distribution of dark matter hot spots was tested for significant deviations from random atdiffer- ent scales. Then, the database was used to estimate the growth rate of dark matter superstructures. These data were then combined to find that the Cosmological Principle will fail, at all scales,inan- other 54.7 billion years (a 68.4 billion-year-old Universe). Given that life could exist in the Universe for another 120 trillion years, the Cosmological Principle appears to be a fleeting characteristic of the infant Universe.
Higgs and EWSB / 92
Physics Reach and Detector Optimization at the CEPC
Author: Manqi RUAN1
1 Institute of High Energy Physics
Corresponding Author: [email protected]
The CEPC project is the next generation of large-scale collider. With a total circumference of100km and a center of mass energy from the Z pole to 240 GeV, CEPC is expected to deliver 1 Million Higgs boson and 10 Billion Z bosons in its electron-positron collision phase, and it could be upgraded to a proton collider whose energy reaches 100 TeV regime. Such huge productivity makes strigent requirement on the detector performance. In this presen- tation, we will briefly summarize the physics reach and detector optimization studies at theCEPC.
Computing, Analysis Tools, and Data Handling / 93
Using the Jets-without-Jets Algorithm to Model MET in an AT- LAS Level-1 Trigger Algorithm
Author: Rebecca Linck1
1 Indiana University
Corresponding Author: [email protected]
The Jets-without-Jets algorithm presents a novel approach to the determination of jet observables without the need for timely jet reconstruction. Because it relies on a set of simple sums, the algorithm is well suited to the kinds of fast real-time calculation that are required for a trigger algorithm. Following the current data taking period, the global feature extractor (gFEX) will be incorporated into the AT- LAS Level-1 calorimetry trigger system. The capacity of the gFEX to process information from the whole calorimetry system on a single board makes it ideal for the determination of whole event quantities. This presentation will discuss the development of a trigger algorithm that uses theJets- without-Jets algorithm and the gFEX to model missing transverse energy (MET).
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Diversity, Education, and Outreach / 94
US-CERN Virtual Visits: Building Transcontinental Connections for High Energy Physics
Author: Julia Gonski1
1 Harvard University
Corresponding Author: [email protected]
For nearly fifteen years, Virtual Visits at CERN have been bringing high-energy physics research directly to the public, through the use of videoconferencing systems at both ATLAS and CMS experi- mental sites. Over 30,000 people from all seven continents have participated in Virtual Visits to date, engaging students, teachers, artists, and general enthusiasts alike. While these connections often take place in science festivals or classrooms, the versatility of the medium allows the visit to be cus- tomized for any audience. In particular, Virtual Visit connections to the United States can integrate a population for which distance from the experiment may hinder education and awareness. Examples of such targeted audiences include US Congressional offices and other governmental institutions, to enhance dialogue about the benefits of global basic research, and historically underrepresented or underserved minority groups. Both the foundational work and future possibilities of US Virtual Visit connections is discussed.
Dark Matter / 95
Search for new physics phenomena using events with missing transverse momentum and a Higgs boson decaying into two pho- tons at sqrt(s) = 13 TeV with the ATLAS experiment
Author: Chen Zhou1
1 University of Wisconsin-Madison
Corresponding Author: [email protected]
A search for new physics phenomena is presented using events with missing transverse momentum and a Standard Model Higgs boson decaying into two photons. This search is based on 13 TeV proton- proton collision data collected by the ATLAS detector at the LHC in 2015 and 2016, corresponding to an integrated luminosity of 36.1 fb−1. No significant excess over the Standard Model expectation is observed. Upper limits at 95% confidence level on the production cross section times the branch ratio of the Higgs boson decaying into two photons are set for two Dark Matter models and a heavy scalar boson model. Additionally, the results are interpreted in terms of 90% confidence level limits on the dark matter-nucleon scattering cross section, as well as 95% confidence level limits onvisible cross section.
Higgs and EWSB / 98
Searching for heavy ZZ resonance in four-lepton or di-lepton and di-neutrino final states with the ATLAS experiment
Author: Xiangyang Ju1
1 University of Wisconsin-Madison
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Corresponding Author: [email protected]
This talk presents a search for heavy resonances decaying into a pair of Z bosons which decaysubse- quently to \ell\ell\ell\ell and \ell\ell\nu\nu final states. The search uses proton-proton collision data at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 36 fb−1 collected with the ATLAS detector during 2015 and 2016. The maximum deviation from SM background is reported. In addition, the results are also interpreted as generic upper limits on the production cross section of a spin-0 and spin-2 resonance, and the exclusion contour in the context of two-Higgs- doublet Model.
Beyond Standard Model / 99
Little hierarchy in the minimally specified MSSM
Author: Radovan Dermisek1
1 Indiana University
Corresponding Author: [email protected]
We study constrained versions of the minimal supersymmetric model and investigate the hierarchy between the electroweak scale and the scale of superpartners that can be achieved without relying on specifying model parameters by more than one digit. This approach automatically avoids scenarios in which a large hierarchy is obtained by special choices of parameters and yet keeps scenarios that would be otherwise disfavored by various sensitivity measures. We consider models with univer- sal gaugino and scalar masses, models with non-universal Higgs masses or non-universal gaugino masses and focus on scenarios in which all the model parameters are either of the same order or zero at the grand unification scale. We find that the maximal hierarchy between the electroweak scaleand stop masses, requiring that model parameters are not specified beyond one digit, ranges from a factor of 30 for the CMSSM up to 300 for models with non-universal Higgs or gaugino masses.
Beyond Standard Model / 100
Search for low mass dijet resonances in association with ISR at the ATLAS experiment
Author: Laser Kaplan1
1 University of Wisconsin-Madison
Corresponding Author: [email protected]
A search for low mass resonances decaying to a jet pair in association with an ISR jet or photon in the context of a dark matter mediator. The ISR object acts as the event trigger, and the resonance jetpair is subsequently boosted and reconstructed as a large-radius jet. Novel jet substructure techniques allow for signal jets to be selected over the dominant QCD background. The search uses 36 fb ofpp collision data at a center-of-mass energy of 13 TeV collected in 2015 and 2016 by the ATLAS detector at the LHC. Resonances are searched for in the mass range of 100-250 GeV, using a leptophobic Z’ benchmark model.
Higgs and EWSB / 101
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Measurement of Higgs boson production in the diphoton decay channel with the ATLAS experiment
Author: Zirui Wang1
1 Shanghai Jiao Tong Univ. / U.Michigan
Corresponding Author: [email protected]
The measurement of the production cross section of the Higgs boson in the diphoton decay channel is presented, using proton-proton collision data collected at √s=13 GeV by the ATLAS experiment 2015 and 2016. Diphoton candidate events from different production modes are analyzed by a simul- taneous fit to the invariant mass spectrum.
Neutrino Physics / 102
Dimension 7 neutrino mass generation and its implications for the LHC and the dark matter
Author: Satyanarayan Nandi1 Co-authors: K.S. Babu 1; Kirtiman Ghosh 2; Sudip Jana 1; Zurab Tavartkiladze 3
1 Oklahoma State University 2 Institute of physics, Bhubaneswar, India 3 Ilia State University
Corresponding Author: [email protected]
Neutrino mass generation by the effective dimension seven operators leads to a different seesaw relation, m_nu ˜ vˆ3 / Mˆ2 compared to the usual seesaw one, m_nu ˜ vˆ2 / M. The model [1] incor- porating this has an isospin 3/2 scalar multiplet along with iso-triplet leptons, both of which can be at the TeV scale. The model can accommodate the neutrino masses and mixings, and both thedirect and indirect mass hierarchy. The isospin 3/2 scalar contains triply charged scalar particles, andcan be produced at the LHC via the Drell-Yan as well as photon fusion. Depending on the induced VEV of the isospin 3/2, the triply charged scalar can decay immediately, or produce displaced vertex. The final states give rise to same sign di-leptons, as well as tri-leptons, and can be observed attheLHC in the current or upcoming runs [2]. The model also has interesting implications for the dark matter detection experiments [3].
1. New mechanism for neutrino mass generation, and triply charged Higgs boson at the LHC, K. S. Babu, S. Nandi and Z. Tavartkiladze: Phys. Rev. D80:071702, 2009. 2. Neutrino mass and scalar singlet dark matter, S. Bhattacharya, S. Jana, S. Nandi, e-Print arXiv: 1609.03274[hep-ph], Phys. Rev. D 95(2017) no5, 055003. 3. Neutrino mass generation at the TeV scale and new physics signatures from the charged Higgs for photon initiated processes, Kirtiman Ghosh, Sudip Jana and S. Nandi, e-Print: arXiv: 1705.01121[hep- ph].
Neutrino Physics / 103
The Short Baseline Near Detector at Fermilab
Author: José Ignacio Crespo-Anadón1
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1 Columbia University Nevis Laboratories
Corresponding Author: [email protected]
SBND (Short-Baseline Near Detector) is a 112 ton liquid argon TPC neutrino detector under construction on the Fermilab Booster Neutrino Beam. Together with MicroBooNE and ICARUS-T600, SBND will search for shortbaseline neutrino oscilla- tions in the 1 eVˆ2 mass range. SBND will also perform detailed studies of the physics of neutrino-argon interactions, thanks to a data sample of millions of electron and muon neutrino interactions. Finally SBND plays an important role in the on-going R&D effort to develop the LArTPC technology, testing several technologies that can be used in a future kiloton-scale neutrino detectors for a long-baseline experiment. We will discuss the detector design, its current status, and the physics program.
Poster Session and Reception / 104
New fermionic dark matters, extended standard model and cos- mic rays
Author: Jae-Kwang Hwang1
1 JJJ Physics Laboratory
Corresponding Author: [email protected]
Three generations of leptons and quarks correspond to the lepton charges (LC) in the present work. Then, the leptons have the electric charges (EC) and lepton charges (LC). The quarks have theEC, LC and color charges (CC). Three heavy leptons and three heavy quarks are introduced tomake the missing third flavor of EC. Then the three new particles which have the electric charges(EC) are proposed as the bastons (dark matters) with the rest masses of 26.121 eV/c2, 42.7 GeV/c2 and 1.9 1015 eV/c2. The RK anomaly is discussed here. And these new particles are applied toexplain the origins of the astrophysical observations like the ultra-high energy cosmic rays and super-nova 1987A anti neutrino data. It is concluded that the 3.5 keV x ray peak observed from the cosmic x-ray background spectra is originated not from the pair annihilations of the dark matters but from the x-ray emission of the Q1 baryon atoms which are similar in the atomic structure to the hydrogen atom. New particles can be indirectly seen from the astrophysical observations like the cosmic ray and cosmic gamma ray [1,2]. [1] https://www.researchgate.net/publication/314877019 . [2] https://www.researchgate.net/publication/314246000 .
Field and String Theory / 105
Black hole unitarity via small couplings: basic postulates to soft quantum structure
Author: Steve Giddings1
1 Department of Physics, University of California, Santa Barbara
Corresponding Author: [email protected]
The problem of preserving unitary evolution in the presence of an evaporating black hole remains a key problem in quantum gravity, expected to point to new fundamental principles. It has been argued that unitary evolution implies breakdown of spacetime at the horizon (a “firewall”), or other large near-horizon effects. I explore a basic set of postulates, including a “correspondence princi- ple” for observers falling into large black holes, and find the possibility that unitarization occurs via
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weak interactions between quantum states of a black hole and degrees of freedom in its environ- ment.
QCD / 107
On HQET and NRQCD Operators of Mass Dimension 8 and Above
Author: AYESH GUNAWARDANA1
Co-author: Gil Paz 1
1 Wayne State University
Corresponding Author: [email protected]
Effective field theories such as Heavy Quark Effective Theory (HQET) and Non Relativistic Quantum Chromo-(Electro-) dynamics NRQCD (NRQED) are indispensable tools for controlling the effects of the strong interaction. The increasing experimental precision requires the knowledge of higher di- mensional operators. These operators are important to the evaluation of decay rates of the B-meson. We present a general method that allows for an easy construction of HQET (NRQED and NRQCD) operators that contain two heavy quark (non-relativistic) fields and any number of covariant deriva- tives. As an application of our method, we give for the first time all such terms in the 1/Mˆ4 NRQCD Lagrangian, where M is the mass of the spin-half field. We analyze the general dimension-nine spin-independent HQET matrix element, which was not considered so far in the literature, and cal- culate moments of the leading power shape function up to and including dimension nine HQET operators.
Poster Session and Reception / 108
CMS Pixel Detector Upgrade for HL-HLC
Author: Yangyang Cheng1
1 Cornell University
Corresponding Author: [email protected]
To meet the experimental challenges and reach the physics potential of the High Luminosity LHC (HL-LHC), the CMS experiment will be replacing its current pixel detector with new technology and designs. The upgrade plan includes extending the inner pixel detector in the forward regionfrom the current coverage of |\eta|<2.4 to 4, and adopting small-pitch pixel sensors and next-generation electronic read-out. This talk reviews the objective and status of the pixel detector upgrade. Studies in simulation, from design optimization, detector modeling, and performance estimation, will be the focus of this talk. Finally, potential physics benefits from the upgrade are discussed.
Particle Detectors / 109
Upgrade of the ATLAS Monitored Drift Tube Electronics for the HL-LHC
Author: yu liang1
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1 University of Michigan
Corresponding Author: [email protected]
To cope with large amount of data and high event rate expected from the planned High-Luminosity LHC (HL-LHC) upgrade, the ATLAS monitored drift tube (MDT) readout electronics will be replaced. In addition, the MDT detector will be used at the first-level trigger to improve the muon transverse momentum resolution and reduce the trigger rate. A new trigger and readout system has been proposed. Prototypes for two frontend ASICs and a data transmission board have been designed and tested, detailed simulation of the trigger latency has been performed, and segment-finding and track fitting algorithms have been developed. We will present the overall design of the triggerand readout system and show latest results from various prototype studies
Neutrino II / 110
PROSPECT: The Precision Reactor Oscillation and Spectrum ex- periment
Author: Pranava Teja Surukuchi1
1 Illinois Institute of Technology
Corresponding Author: [email protected]
PROSPECT is a short-baseline reactor antineutrino experiment with primary goals of performing a search for sterile neutrinos and making a precise measurement of 235U reactor antineutrino spec- trum from the High Flux Isotope Reactor at Oak Ridge National Laboratory. Using a ˜ 4-ton seg- mented PSD-capable 6Li-loaded liquid scintillator detector, the PROSPECT detector will provide excellent background rejection in a high background and limited overburden environment. By cover- ing the baselines of 7-12 m, the PROSPECT experiment will be able to probe eV-scale sterile neutrino oscillations suggested by the previous reactor experiments model-independently. With excellent en- ergy resolution, PROSPECT will also be able to address the spectral anomaly recently observed by Θ13 experiments. This presentation will give an overview of the experimental program, detector design and physics reach of the PROSPECT experiment.
Particle Detectors / 112
Performance of the ATLAS Tile Calorimeter in Run 2 and Elec- tronics Upgrade for High Luminosity LHC
Author: Joakim Olsson1
Co-author: David Miller 1
1 University of Chicago
Corresponding Author: [email protected]
The Tile Calorimeter (TileCal) is the hadronic calorimeter covering the central region oftheATLAS experiment at the Large Hadron Collider (LHC). This talk is divided into two parts. The first partwill present studies of the TileCal energy scale using in-situ E/p measurements conducted during Run 2 of the LHC. The second part will discuss the plans and current results of the program to upgrade the TileCal front-end electronics for the High Luminosity LHC (HL-LHC) Phase-II upgrade, scheduled for the mid-2020s. Specifically, the performance of prototype electronics currently being testedin an extensive program of test beam studies will be presented.
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Particle Detectors / 113
Front End Digitization of tRPCs in the ATLAS Muon Spectrome- ter Phase-1 Upgrade
Author: Xiangting Meng1 Co-authors: Daniel Levin 1; John Chapman 1
1 University of Michigan
Corresponding Author: [email protected]
The ATLAS Muon Spectrometer Phase-1 high luminosity upgrade program includes the stagingof thin Resistive Plate Chambers (tRPC) to increase trigger acceptance and reduce fake muon trigger rates in the barrel-endcap transition region, corresponding to pseudo-rapidity range 1<|η|<1.3. The tRPC signals will be processed with front-end digitization electronics that make use of the CERN based HPTDC and Gigabyte Optical Link microchips. Low level trigger candidates must be flagged within a maximum latency of 1075 ns, thus imposing stringent signal processing time performance requirements on the readout system in general, and on the digitization electronics in particular. In this talk we report on the design of the tRPC front end digitization electronics. The performance based on both Verilog simulations and measurements using a prototype board under realistic hit rate conditions indicates that the HPTDC in triggerless mode operation satisfies the timing, resolution and power requirements.
Particle Detectors / 114
Enhancing the muon physics program of the CMS experiment during the high luminosity LHC with triple-foil GEM detectors in the forward region
Author: Jared Sturdy1
1 Wayne State University
Corresponding Author: [email protected]
In order to cope with the increased background rate expected during the high luminosity running of the LHC, the muon system of the CMS experiment will install several upgrades. These upgrades will allow CMS to maintain the quality of its physics program by ensuring that the triggering perfor- mance does not degrade, and further extending the muon detector acceptance. This talk will focus on the first of these upgrades, triple-foil Gas Electron Multiplier (GEM) detectors installed inthe innermost station of the CMS endcap muon system (GE1/1) during the 2019-2020 LHC long shut- down (LS2). A demonstrator system has been installed during the extended year-end technical stop of 2016-2017, and observations and first results will be reported.
Dark Matter / 115
Dark matter collider at DUNE: relativistic scattering of boosted dark matter
Authors: Doojin Kim1; Jong-Chul Park2; Seodong Shin3
1 CERN 2 Chungnam National University
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3 Yonsei University
Corresponding Author: [email protected]
I will talk about a novel dark matter (DM) detection strategy for the models with non-minimal dark sector such as “inelastic boosted DM”, which expects a secondary cascade signature after an inelastic and relativistic scattering of a light dark matter component. I will discuss the detection prospectsat DUNE. The boosted DM can be produced both in the current universe and in the fixed target.
Dark Matter / 116
An Indirect Search for Weakly Interacting Massive Particles in the Sun Using Upward-Going Muons in NOvA
Author: Cristiana Principato1
Co-authors: Andrew Norman 2; Leonidas Aliaga Soplin 3; Robert Group 1
1 University of Virginia 2 Fermilab 3 College of William and Mary
Corresponding Author: [email protected]
We present the status of the a dark matter search using a dataset collected with an upward-going muon trigger at NOvA. Weakly Interactive Massive Particles are a theoretical potential non-baryonic form of Dark Matter. The nature of Dark Matter is one of the most interesting open questions in modern physics. Evidence for DM existence comes from cosmological observations but the discovery has not been made yet. If we assume that DM particles can produce Standard Model particles through their interactions, indirect searches can help shed light on this mystery. The NOvA collaboration has constructed a 14,000 ton, fine-grained, low-Z, total absorption tracking calorimeter. This detector, with its excellent granularity and energy resolution and relatively low-energy neutrino thresholds, is designed to observe electron neutrino appearance in a muon neutrino beam: but it also has unique capabilities suitable for more exotic measurements. In fact, with an efficient upward-going muon trigger and sufficient background suppression offline, NOvA will be capable of a competitive indirect dark matter search for low-mass WIMPs. To avoid the downward-going cosmic-ray muon background, we use only upward-going muons that point to the Sun. So, the search occurs at night when the Sun is on the other side of the Earth. This also allows us to use the time when the Sun is above the horizonasa control region to estimate the background. The goal is to select a sample of neutrino-induced upward-going muons and perform a competitive dark matter search.
Beyond Standard Model / 117
Search for electroweak production of a vectorlike quark decaying to a top quark and a Higgs or Z boson using boosted topologies in an all-hadronic final state
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Authors: Alice bean1; Devdatta Majumder2; Erich Schmitz2; Graham Wilson2; Philip Baringer2
1 Univ of Kansas 2 University of Kansas
Corresponding Author: [email protected]
We present a search for the electroweak production of a vector-like top quark partner T of charge + 2/3 in association with a standard model top or bottom quark, using proton-proton collision data at √s=13 TeV collected by the CMS Experiment at the CERN LHC. Our search targets T quarks decaying to a top quark and a Higgs or Z boson in a fully hadronic final state. For a T quark with mass above1 TeV the daughter top quark and Higgs/Z boson are highly Lorentz-boosted and can appear together as a single hadronic jet. The top quark and Higgs/Z boson are identified using b-tagging andjet substructure techniques, which also acts to suppress the standard model backgrounds.
Quark and Lepton Flavor / 118
Semileptonic B-meson decays to light pseudoscalar mesons with lattice QCD
Author: Zechariah Gelzer1
Co-authors: Andreas Kronfeld 2; Yannick Meurice 3
1 University of Iowa 2 Fermilab 3 U. of Iowa
We present the status of an ongoing lattice-QCD calculation of form factors for exclusive semilep- tonic decays of B mesons with both charged currents (B → πℓν, Bs → Kℓν) and neutral currents (B → πℓ+ℓ−, B → Kℓ+ℓ−). The results are important for constraining or revealing physics beyond the Standard Model. This work uses MILC’s (2+1+1)-flavor ensembles, with the HISQ action forthe sea and light valence quarks, and the clover action in the Fermilab interpretation for the b quark. Simulations are carried out at four lattice spacings down to 0.088 fm, with both physical and afew nonphysical sea-quark masses. We present preliminary results for correlation-function fits and the chiral-continuum extrapolation of the form factors.
Top Quark Physics / 119
Measurement of quantum interference between doubly and singly resonant top quark production with the ATLAS experiment
Author: Theodor Christian Herwig1
1 University of Pennsylvania
Corresponding Author: [email protected]
Physics processes involving top quarks compose a major background for many searches for new physics. Both doubly-resonant “ttbar” and singly-resonant “single top” processes can contribute at similar levels where sophisticated tools are used to effectively reduce ttbar backgrounds. However, because both ttbar and Wt single top with an additional b-quark in the final state can yieldaniden- tical final state (WWbb) the processes quantum-mechanically interfere. The ambiguity in howthis interference is modeled can lead to large theoretical uncertainties on the Wt prediction.
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A measurement is presented that is designed to probe the WWbb final state in a region of large interference, selecting final states with two isolated leptons and b-tagged jets. The result usesdata from pp collisions delivered by the Large Hadron Collider in 2015 and 2016 at a center-of-mass energy of 13 TeV recorded by the ATLAS detector, corresponding to an integrated luminosity of 36/fb. Differential distributions of interference-sensitive variables are measured and subsequently unfolded to truth level. The analysis is sensitive to differences in the modeling of the interference term provided by state-of-the-art WWbb generators
Higgs and EWSB / 120
Search for the Higgs boson production in association with top quarks at \sqrt{s} = 13 TeV with the ATLAS detector
Author: HAICHEN WANG1
1 Lawrence Berkeley National Laboratory
Corresponding Author: [email protected]
The observation of the Higgs boson production in association with top quarks (ttH) is ofparticular importance, as it will be a direct evidence of the top Higgs Yukawa coupling. Further measurements of this process may be sensitive to potential new physics beyond the Standard Model, due to the large value of the top Yukawa coupling. I present searches for this production mode using ATLAS data taken in 2015 and 2016 at a center-of-mass energy of 13 TeV, with a focus on the analyses of diphoton and bbbar final states.
Beyond Standard Model / 121
Searches for new physics using long-lived particles with the CMS detector
Author: Todd Adams1
1 Florida State University
Corresponding Author: [email protected]
We present results of searches for new physics using long-lived particles using data recorded by CMS during Run-II of the LHC. Searches include long-lived charged particles and highly displaced decays. These searches are sensitive to numerous beyond the standard model theories and greatly expand the discovery potential of the LHC.
Particle Detectors / 122
Modeling Radiation Damage to Pixel Sensors in the ATLAS De- tector
Author: Benjamin Nachman1
1 LBNL
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Corresponding Author: [email protected]
Silicon Pixel detectors are at the core of the current and planned upgrade of the ATLAS detector. As the detector in closest proximity to the interaction point, these detectors will be subjected to a significant amount of radiation over their lifetime: prior to the HL-LHC, the innermost layers 15 2 will receive a fluence in excess of 10 1 MeV neq/cm and the HL-LHC detector upgrades must cope with an order of magnitude higher fluence integrated over their lifetimes. This talk presents a digitization model that includes radiation damage effects to the ATLAS Pixel sensors for the first time. After a thorough description of the setup, predictions for basic Pixel cluster properties are presented alongside first validation studies with Run 2 collision data.
Computing, Analysis Tools, and Data Handling / 123
Data Acquisition with GPUs for the Muon g-2 Experiment at Fer- milab
Author: Wes Gohn1
1 University of Kentucky
Corresponding Author: [email protected]
A new measurement of the anomalous magnetic moment of the muon, aµ ≡ (g − 2)/2, will be performed at the Fermi National Accelerator Laboratory. The most recent measurement, performed at Brookhaven National Laboratory and completed in 2001, shows a 3.5 standard deviation discrep- ancy with the standard model value of aµ. The new measurement will accumulate 21 times those statistics, measuring aµ to 140 ppb and improving the uncertainty by a factor of 4 over that of the previous measurement. The data acquisition system for this experiment must have the ability to create deadtime-free records from 700 µs muon fills at a raw data rate 20 GB per second. Data will be collected using 1296 channels of µTCA-based 800 MSPS, 12 bit waveform digitizers and processed in a layered array of networked commodity processors with 26 Nvidia Tesla K40 GPUs working in parallel to perform a fast recording of the muon decays during the spill. The system will be controlled using the MIDAS data acquisition software package. The described data acquisition system is currently being commissioned, andwill be fully operational before the start of the experiment later in 2017.
Computing, Analysis Tools, and Data Handling / 124
Instantaneous luminosity calibration of the ATLAS experiment with Z → µ−µ+
Authors: Harish Potti1; Peter Onyisi1
1 University of Texas at Austin
Corresponding Author: [email protected]
In this talk, a new method of calibrating the instantaneous luminosity of the ATLAS experiment with Z → µµ process is presented. At the designed center-of-mass energy of the LHC, cross-section of Z → µµ process is known to a very high precision and has a very good production rate (˜1000 events/minute), which makes it suitable for luminosity measurement. Leading systematic uncer- tainties in this method come from the Standard Model theory, which are totally different compared to the leading systematic uncertainties on the current ATLAS luminosity measurement based on the Van der Meer method. A comparison of results with the official ATLAS luminosity measurements is presented for the entire data collected in 2015 and 2016.
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Higgs and EWSB / 125
Search for ttH production in multilepton final states using the ATLAS experiment at the LHC
Authors: Harish Potti1; Peter Onyisi1
1 University of Texas at Austin
Corresponding Author: [email protected]
The search for Higgs boson production in association with two top quarks allows the directmea- surement of Higgs boson- top quark Yukawa coupling. In this talk, results from the measurement of ttH¯ production decaying into multilepton final states are presented. This search uses 36fb−1 of proton-proton collision data collected by the ATLAS experiment at the center-of-mass energy of 13 TeV in 2015 and 2016. The analysis is most sensitive to H → WW , H → ZZ and H → ττ decay modes.
Computing, Analysis Tools, and Data Handling / 126
Deep Neural Networks for HEP Images
Authors: Benjamin Nachman1; Eric Metodiev2; Francesco Rubbo3; Lucio Dery4; Luke de Oliveira1; Matt Schwartz5; Michela Paganini6; komiske Patrick2
1 LBNL 2 MIT 3 SLAC National Accelerator Laboratory 4 Stanford 5 Harvard 6 Yale
Corresponding Author: [email protected]
Deep neural networks (DNNs) have revolutionized many areas of science and technology. In this talk, we will discuss cutting edge developments in DNNs for high energy physics, using jet physics (including calorimeter showers) as an example that has attracted significant recent attention. Do- main specific challenges require new techniques to make full use of the algorithms. A keyfocus is on understanding how and what the algorithms learn. DNN techniques are demonstrated for classification, regression, and generation. In addition to providing powerful baseline performance, we show how to train complex models directly on data and to generate sparse stacked images with non-uniform granularity.
Particle Detectors / 128
Commissioning and operation of the new CMS Phase 1 pixel de- tector
Author: Weinan Si1
1 UC Riverside
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Corresponding Author: [email protected]
The Phase I upgrade of the CMS pixel detector is built out of four barrel layers (BPIX) andthree forward disks in each endcap (FPIX). It comprises a total of 124M pixel channels, in 1,856 modules and it is designed to withstand instantaneous luminosities of up to 2 x 10ˆ34 cm-2 s-1. Different parts of the detector have been assembled over the last year and later brought to CERN for installation inside the CMS tracker. At various stages during the assembly tests have been performed to ensure that the readout and power electronics, and the cooling system meet the design specifications. After tests of the individual components, system tests have been performed before the installation inside CMS. In addition to reviewing these tests, we also present results from the final commissioning of the detector in-situ using the central CMS DAQ system. Finally we review results from the initial operation of the detector first with cosmic rays and then with pp collisions.
Neutrino II / 129
Cold electronics preparation for the protoDUNE experiment
Author: Guang Yang1
1 Stony brook university
Corresponding Author: [email protected]
The main purpose of the DUNE experiment is to measure the CP-violation phase in long-baseline neutrino oscillations with a liquid-argon detector of unprecedented size. The DUNE detector will consist of a liquid-argon Time Projection Chamber. The protoDUNE detectors at CERN are prototypes of the full-scale DUNE experiment; their operation will provide important input for the success of DUNE. Cold electronics is one of the most challenging topics for DUNE and protoDUNE. The functionality of the front-end motherboard and warm interface board needs to be understood at a detailed level. In this talk, the integration test plan, as well as results of tests of the protoDUNE cold electronics will be pre- sented.
Poster Session and Reception / 130
Reaching Out for Particle Physics
Author: Marjorie Bardeen1 Co-authors: Hans Peter Beck 2; Steve Goldfarb 3
1 FNAL 2 University of Bern 3 University of Melbourne
Corresponding Author: [email protected]
The International Particle Physics Outreach Group (IPPOG) is a global network of physicists and educators committed to promote the particle physics research in the community through informal education and outreach. Following the model of experimental particle physics collaborations, IPPOG itself has become a scientific collaboration based on a memorandum of understanding. We describe the collaboration and its work to share ideas and best practices for reaching both scientist enthusiasts and audiences new to science.
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Higgs and EWSB / 131
Search for lepton-flavour-violating decays of the Higgs boson with the ATLAS experiment
Author: Atanu Pathak1 Co-author: Swagato Banerjee 1
1 University of Louisville
Corresponding Author: [email protected]
A direct search for lepton flavour violation in decays of the Higgs boson with the ATLAS detector at the LHC is presented. The analysis is performed in the H→ℓτ channel, where the leading lepton can be either an electron or a muon and where the tau decays hadronically. The search is based on the data sample of proton–proton collisions collected by the ATLAS detector corresponding to an integrated luminosity of 36 fb−1 at a centre-of-mass energy of √s=13TeV.
Dark Matter / 132
Search for Dark Matter Produced in Association with a Higgs Bo- son Decaying to bb at sqrt(s) = 13 TeV with the ATLAS Experi- ment
Author: Efe Yigitbasi1
1 Boston University
Corresponding Author: [email protected]
Several extensions of standard model predict dark matter production in association with a Higgs boson. In this talk the results of a search for such models in final states with large missing trans- verse momentum and a Higgs boson decaying to b¯b will be presented. The search is performed with the ATLAS detector using 36 fb-1 of pp collisions at a center-of-mass energy of 13 TeV atthe LHC. The results are interpreted in the context of a Dark Matter model and without extramodel assumptions.
Poster Session and Reception / 134
A Flux Spectrometer for LBNF/DUNE
Author: Laura Fields1
1 Fermilab
Corresponding Author: [email protected]
The Long-Baseline Neutrino Facility (LBNF) will include a conventional neutrino beam madeby colliding a high energy proton beam with a fixed target, focusing the resulting hadron using aset of magnetic horns and allowing them to decay to neutrinos. As with most conventional neutrino beams, uncertainties on the number of neutrinos in the beam as a function of energy are of order 10%. The Flux Spectrometer is a proposal to measure the LBNF hadron flux after the focusing hornsand before the decay volume, substantially reducing uncertainties in the neutrino flux. Recent work on the Spectrometer, including potential locations, possible designs and preliminary simulations, will be presented.
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Diversity, Education, and Outreach / 135
Developments in International Masterclasses
Author: Kenneth Cecire1
1 University of Notre Dame
Corresponding Author: [email protected]
International Masterclasses are one-day events at universities and laboratories in which high school students can, under the tutelage of experts, be “particle physicists for a day”. International Master- classes bring students to the cutting edge of science by enabling them to analyze authentic exper- imental data. More recently, new initiatives are expanding the range of masterclasses in terms of populations of students, venues, and particle physics experiments. We will discuss these develop- ments and where they may lead.
Particle Detectors / 136
Development of Trigger and Readout Electronics for the ATLAS New Small Wheel Detector Upgrade
Author: LIANG GUAN1 Co-author: Junjie Zhu 1
1 University of Michigan
Corresponding Author: [email protected]
The present small wheel muon detector at ATLAS will be replaced with a New Small Wheel (NSW) detector to handle the increase in data rates and harsh radiation environment expected at the LHC. Resistive Micromegas and small strip Thin Gap Chambers will be used to provide both trigger and tracking primitives. Muon segments found at NSW will be combined with the segments found at the Big Wheel to determine the muon transverse momentum at the first-level trigger. A new trigger and readout system is developed for the NSW detector. The new system has about 2.4 million trigger and readout channels and about 8,000 Front-End boards. The large number of input channels, short time available to prepare and transmit data, harsh radiation environment, and low power consumption all impose great challenges on the design. We will discuss the overall electronics design and studies with various ASICs and high-speed circuit board prototypes.
QCD / 137
Quark versus Gluon Jet Tagging Using Charged-Particle Constituent Multiplicity with the ATLAS Experiment
Authors: Benjamin Nachman1; Francesco Rubbo2
1 LBNL 2 SLAC National Accelerator Laboratory
Corresponding Author: [email protected]
Distinguishing quark-initiated from gluon-initiated jets is useful for many measurements and searches at the LHC. We present a quark-initiated versus gluon-initiated jet tagger from the ATLAS experi- ment using the number of reconstructed charged particles inside the jet. The measurement of the
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charged-particle multiplicity inside jets from Run 1 is used to derive uncertainties on the tagger per- formance for Run 2. With an efficiency of 60% to select quark-initiated jets, the efficiency toselect gluon-initiated jets is between 10 and 20% across a wide range in jet pT up to 1.5 TeV with about an absolute 5% systematic uncertainty on the efficiencies.
Beyond Standard Model / 138
Search for Contact Interactions in μ + μ − and e + e − Final States in 13 TeV p-p Collisions at CMS
Author: Shawn Zaleski1
1 Wayne State University
Corresponding Author: [email protected]
We report results on the nonresonant search for contact interactions (CI) sqrt(s) using data collected during the 2016 run, in proton-proton collisions at sqrt(s) = 13 TeV by the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) at CERN. The analyzed data correspond to integrated luminosities of about 36 fb −1 . Results are interpreted in the context of left-left (LL), left-right (LR), and right-right (RR) quark and lepton compositeness models with an energy scale parameter Λ. Using information from the invariant mass and Collins-Soper angle we set 95 % confi- dence level lower limits on Λ for both destructive and constructive interference models.
Neutrino Physics / 139
Recent Developments in T2K Oscillation Analysis
Author: Xiaoyue Li1
1 Stony Brook University
Corresponding Author: [email protected]
The T2K experiment is a long base-line neutrino experiment located in Japan. Having successfully discovered νe appearance from a νµ beam, T2K is now aimed at probing CP violation in the lepton 2 sector, the mass hierarchy, and the precision measurement of sin θ23. Since data taking started in 2010, T2K has accumulated 14.7 × 1020 protons on target (POT) in neutrino beam mode, and 7.6 × 1020 POT in antineutrino beam mode. A new reconstruction algorithm for Super-Kamiokande (SK) – the far detector of T2K – is being used for event selection for the first time. The SK fiducial volume has been expanded,increasing the statistics by ∼ 20% from the previous selection with the same beam exposure. The latest develop- ments in the T2K oscillation analysis within the PMNS framework, especially the measurement of δCP , will be presented, and details of the analysis will be discussed.
Computing, Analysis Tools, and Data Handling / 140
Data unfolding with Wiener-SVD Method
Authors: Wei Tang1; Xiaoyue Li2 Co-authors: Chao Zhang 3; Hanyu Wei 4; Xin Qian 1
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1 BNL 2 Stony Brook University 3 Brookhaven National Laboratory) 4 Center for High Energy Physics, Tsinghua University
Corresponding Author: [email protected]
Data unfolding is a commonly used technique in the HEP community, particularly in cross-section measurements. Inspired by the deconvolution technique in digital signal processing, we propose a new unfolding method based on Wiener filter and the SVD technique. Unlike traditional unfolding techniques, the Wiener-SVD unfolding method achieves data unfolding by maximizing signal to noise ratios in the effective frequency domain without having to scan over regularization strength. The mathematical formulation of the method and few applications of the Wiener-SVD unfolding technique will be presented; the advantages and disadvantages, as well as the nature of the unfolded results will be discussed.
Diversity, Education, and Outreach / 141
Phantom of the Universe: A Planetarium Show about Dark Mat- ter
Authors: Kaushik De1; Michael Barnett2; Reinhard Schwienhorst3
1 Univ. of Texas at Arlington 2 LBNL 3 Michigan State University
Corresponding Author: [email protected]
A new planetarium show about Dark Matter is entitled “Phantom of the Universe”. Recently com- pleted, it features the exciting story of dark matter, from galaxies to a deep underground experiment to the Large Hadron Collider. It is being distributed for free to planetariums worldwide. The show is a finalist at the annual international Full Dome Festival. The show is aimed at a wide rangeofau- diences, from school children to curious adults - providing the general public access to a hot topic in the fundamental exploration of the universe. Fantastic new animations enhance the visual appeal of the show, while Academy Award winner Tilda Swinton provides narration, and an Academy Award winning team at Skywalker Sound provides stunning sound. Planetarium directors and audiences worldwide have given great praise to the show. The show is currently showing or scheduled at about 105 planetariums on all five continents. This talk will provide background on the development of the show, as well as provide highlights of the content.
Dark Matter / 142
Search for dark matter produced in association with a hadroni- cally decaying vector boson at the ATLAS experiment
Author: Yicheng Guo1
1 University of Michigan; University of Science and Technology of China
Corresponding Author: [email protected]
A search for dark matter particles produced in association with a hadronically decaying WorZ boson with the ATLAS experiment at the LHC is reported. The search uses data corresponding to an integrated luminosity of 36.1/fb in proton-proton collisions at a centre-of-mass energy (√s) of13
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TeV. No significant excess over the Standard Model prediction is observed. The search results are interpreted in terms of an effective field theory and a simplified vetor-mediator model describing dark matter interactions with Standard Model particles.
Beyond Standard Model / 143
Searches for Neutron-Antineutron Oscillation in DUNE
Author: Joshua Barrow1 Co-authors: Ben Rybolt 2; Yuri Kamyshkov 2
1 The University of Tennessee 2 University of Tennessee
Corresponding Author: [email protected]
Babu et al. have recently proposed a model of post-sphaleron baryogenesis following the elec- troweak phase transition. Their theory naturally gives rise to a plausible baryon abundance and a ΔB=2 six-quark operator which allows for the generation of nbar from n. Using n bound in Ar, DUNE currently plans to include n-nbar events in their nucleon decay searches. Using GENIE, modeling is underway on intranuclear interactions mimicking n-nbar annihilation in Ar nuclei. Eliminating atmospheric ν background from such events will be a challenge for liquid Ar TPCs at DUNE, so simulation work must be considered for ν interactions in Ar nuclei, which produce similar signals to n-nbar annihilation. Key to understanding possible experimental signals will be the integration of these two for a proper robust analysis, which will determine the viability of any detection of this process above background levels.
Poster Session and Reception / 144
Performance Studies of Capacitively Coupled HVCMOS Pixel Sen- sors Before and After Gamma Irradiation
Author: Dylan Frizzell1 Co-authors: Antonio Miucci 2; Ettore Zaffaroni 3; Francesco Di Bello 3; Jessica Metcalfe 4; Lailin Xu 5; Lingxin Meng 6; Mathieu Benoit 7; Matt Zhang 8; Moritz Kiehn 3
1 University of Oklahoma 2 Universitaet Bern (CH) 3 Universite de Geneve (CH) 4 Argonne National Lab 5 Brookhaven National Laboratory (US) 6 (University of Liverpool/Universite de Geneve) 7 LAL 8 University of Illinois at Urbana Champaign
Corresponding Author: [email protected]
High voltage CMOS pixel sensors are a promising technology that is being considered for particle physics detectors such as the ATLAS Inner Tracker due to their potential to realize a fully monolithic design at considerable cost savings while not compromising on high track reconstruction efficiency, charge collection, and radiation hardness. HVCMOS sensors have circuitry built into each pixel cell that amplifies the signal from the collected charge increasing it enough where it can be read-outvia capacitive coupling by a traditional front-end read-out chip. In the case of a fully monolithic sensor,
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the on-pixel circuitry includes discrimination and digitization. The H35DEMO is a prototype pixel sensor built using 350 nm technology that demonstrates multiple examples of HVCMOS technology including several amplification and digitization matrices. The radiation tolerance of the analogma- trices was assessed using test beam data to measure the impact on track reconstruction performance after gamma irradiation.
Poster Session and Reception / 145
The Low Background Laboratory at Idaho State University
Author: P James Norris1
1 Idaho State University
Corresponding Author: [email protected]
The Deep Underground Neutrino Experiment (DUNE) hopes to study in great detail atmospheric, solar and supernova neutrino events. In order to do so, the background radiation at both the near detector (at Fermilab) and the far detector (at the Sanford research facility in South Dakota) must be understood in great detail. The Low Background Laboratory (LBL) is to be built at Idaho State University (ISU) to understand this background radiation and will be used to control the radio-purity of materials used in the construction of both of the DUNE detectors. The goal of the proposed LBL is to provide a tool to identify the most practical and radiologically clean materials to be used by DUNE and to model the background radiation to be expected in the DUNE detectors over the next 20 years. The cosmic ray background at 4850 feet depth will be relatively small. The background fromnaturally occurring radioactive isotopes however, is expected to be substantial. Just one of the radioactive isotopes in the detector, i.e. 39Ar, is expected to produce a 20KHz background signal, which will severely degrade the detector performance at low energy. Other natural radioactive isotopes, e.g. 40K, 220Rn and 222Rn and the other isotopes from the Uranium and Thorium decay chains, are expected to produce comparable, or higher backgrounds. The LBL will allow us to substantially reduce those radiological backgrounds which we can control by allowing us to select construction materials not only for their performance, but also for their radiological purity. In order to measure as accurately as possible the radiological purity of construction materials, the LBL will reduce the Radon related background by an expected 90% by placing the entire detector system in a class 10000 clean room with autonomous HVAC system, HEPA filters, and the ability to maintain overpressure. The combination of passive and active shielding will substantially reduce the background. Wewill estimate the background reduction factor with Monte Carlo simulations and in situ measurements. Finally, the LBL will model the background radiation to be expected at both the near and far detectors using GEANT4 on the College of Science and Engineering’s Minerve cluster.
Beyond Standard Model / 146
Small Instantons and the Strong CP Problem
Author: Kiel Howe1
1 Fermilab
Corresponding Author: [email protected]
We describe new solutions to the strong CP problem obtained by embedding the Standard Model QCD in a strongly coupled SU(3)xSU(3) or SU(3)xSU(3)xSU(3) product gauge group at high energies, without requiring any discrete symmetries or mirror partners of the SM matter in the extra SU(3) sectors. In one family of solutions, the strong CP problem is solved by axions obtaining masses parametrically larger than the mass generated near the QCD scale, with potentially observable cos- mological, collider, and astrophysical signatures. In a second family of solutions, some of the Yukawa couplings are generated only by non-perturbative effects, solving the strong CP problem in the same
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way as the well-known (but unviable) massless up-quark solution, with no axion-like states present. In this case, a non-zero theta parameter is generated at loop level near current bounds.
Particle Detectors / 147
Track Reconstruction Efficiencies with the H35DEMO HV-CMOS Pixel Detector
Author: Matt Zhang1
Co-authors: Antonio Miucci 2; Dylan Frizzell 3; Emanuele Cavallaro 2; Ettore Zaffaroni 2; Francesco Di Bello 2; Jessica Metcalfe 4; Lailin Xu 2; Lingxin Meng 2; Mateus Pinto 2; Mathieu Benoit 5; Stefano Terzo 2; Thomas Weston 2
1 University of Illinois at Urbana Champaign 2 CERN 3 University of Oklahoma 4 Argonne National Lab 5 LAL
Corresponding Author: [email protected]
The high-luminosity upgrade of the Large Hadron Collider (LHC) scheduled for 2025 requires an upgrade to the pixel sensor technology in the inner tracker of the ATLAS detector. One candidate is based on commercial high-voltage CMOS (HVCMOS) technology. This design can remove the need for an external readout chip by placing all readout circuitry in the sensor itself, thus providing improved signal sensitivity at a lower cost and reduced material budget. In this talk, we present results using the H35DEMO module, a step towards the fully monolithic HVCMOS detector. This module was created using 350 nm technology, and includes in-chip analog amplification, with dis- crimination and readout still provided by a capacitatively-coupled external chip. We compare pixel and track reconstruction efficiencies using several variations of the H35DEMO, presenting results with different substrate resistivities, architectures, and applied voltages.
Poster Session and Reception / 148
Search for Dark Interactions with the ATLAS experiment
Author: Ketevi Adikle Assamagan1
1 Brookhaven National Laboratory
Corresponding Author: [email protected]
Hidden sector or dark sector states appear in many extensions to the Standard Model, to provide a candidate for the dark matter in the universe or to explain astrophysical observations of positron excesses. A hidden or dark sector can be introduced with an additional U(1)d dark gauge symmetry. The presence of the dark sector could be inferred either from deviations from the SM-predicted rates of Drell-Yan (DY) events or from Higgs boson decays through exotic intermediate states. The discovery of the Higgs boson during Run 1 of the Large Hadron Collider opens a new and rich experimental program that includes the search for exotic decays H —> Z Zdark —> 4l and. H —> Zdark Zdark ->4l, where Zdark is a dark vector boson. In this talk, we will review the status of current searches for dark sector states with the ATLAS detector and the prospects for LHC Run 2.
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Neutrino Physics / 149
Status of the Charged Pion Semi-Inclusive Neutrino Charged-Current Cross Section in NOvA
Author: Jyoti Tripathi1
Co-authors: Aristeidis Tsaris 2; Paul Rojas 3
1 Panjab University 2 Fermilab 3 Colorado
Corresponding Authors: [email protected], [email protected]
The NOvA experiment is a long-baseline neutrino oscillation experiment designed to measure the rates of electron neutrino appearance and muon neutrino disappearance. The NOvA near detector is located at Fermilab, 800 m from the primary target and provides an excellent platform to measure and study neutrino-nucleus interactions.We present the status of the measurement of the double dif- ferential cross section with respect to muon kinematics for interactions involving charged pions in the final state, νμ+N → N +μ±π∓X.We have derived a convolutional neural network-based approach for the identification of neutrino interactions with the specific final state topology. Wepresent event classification efficiency studies using this particle identification and classification method- ology, along with systematic uncertainties, background estimates and prospects for the measure- ment.
Top Quark Physics / 151
Direct measurement of the top quark mass in pp¯ collisions at D0
Authors: Bob Hirosky1; Boris Tuchming2; D0 Collaboration3
1 Virginia 2 Saclay 3 Fermilab
Corresponding Authors: [email protected], [email protected]
We report the most recent measurements of the mass of the the top quark, performed by the D0 experiment at the Fermilab Tevatron collider using the full Run II (2001–2011) data set correspond- ing to an integrated luminosity of 9.7 fb−1. This includes measurements in the dilepton channels using the matrix element and neutrino weighting approaches, as well as measurements in the lep- ton+jets channel using the matrix element method. We also discuss the final D0 combination and the preliminary D0+CDF combination of the top quark mass using Run I (1992–1996) and Run II measurements.
Top Quark Physics / 152
Measurement of the pole mass of the top quark using pp̄ → tt̄ production cross sections at D0
Authors: Bob Hirosky1; Boris Tuchming2; D0 Collaboration3
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1 Virginia 2 Saclay 3 Fermilab
Corresponding Authors: [email protected], [email protected]
We present an alternative approach to the direct measurements of the top quark mass using D0 data. We discuss extractions of the pole mass of the top quark based on measurements of the inclusive and unfolded differential ̄pp → tt̄ production cross section as a function of p T (t) and tt̄ mass.. Weusethe full Run II data set of pp̄ collisions collected by the D0 experiment, corresponding to an integrated luminosity of 9.7 fb −1 .
Top Quark Physics / 153
Forward-backward asymmetry in pp̄ → tt̄ events at the Tevatron
Authors: Bob Hirosky1; Boris Tuchming2; Collaboration CDF3; Collaboration D04
1 Virginia 2 Saclay 3 Fermilab 4 Fermiab
Corresponding Authors: [email protected], [email protected], [email protected], [email protected]
We discuss the complete overview of the forward-backward asymmetry measurements in the angu- lar distributions of pp̄ → tt̄ events at the Tevatron collider. These measurements use the fullRunII data set in lepton plus jets and dilepton channels, recorded in the D0 and CDF detectors, correspond- ing to an integrated luminosity of ≈ 2 × 10 fb −1 . The combinations of inclusive and differential asymmetries are presented and compared with the NNLO QCD predictions.
Quark and Lepton Flavor / 156
Measurement of charge asymmetry in B → μD0 X decays at D0
Authors: Bob Hirosky1; Boris Tuchming2; D0 Collaoration3
1 Virginia 2 Saclay 3 Fermilab
Corresponding Authors: [email protected], [email protected]
We present the first measurement of the direct CP-violating charge asymmetry in B± mesons de- caying to μ± D0 X where the D0 decays to K+ π− , using 10.4 fb−1 of proton-antiproton collisions collected by the D0 detector during Run II at the Fermilab Tevatron Collider.
Quark and Lepton Flavor / 157
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Exotic multiquark states in pp̄ collisions at D0
Authors: Bob Hirosky1; Boris Tuchming2; Collaboration D03
1 Virginia 2 Saclay 3 Fermilab
Corresponding Authors: [email protected], [email protected]
We use the full Run II dataset consisting of 10.4 fb −1 of̄ pp collisions recorded by the D0 detector at the Fermilab Tevatron collider at sqrt s = 1.96 TeV to search for new exotic multiquark states. We report the evidence of a new state X(5568) decaying to Bsπ seen in the Bs → J/ψφ decay channel and its independent confirmation in the semi-leptonic channel Bs → μ± Ds∓ X. We also reporton the search for other exotic states.
Higgs and EWSB / 158
Search for the dimuon decay of the Higgs boson with the ATLAS experiment
Author: Aaron White1
1 University of Michigan
Corresponding Author: [email protected]
The Standard Model Higgs boson Yukawa coupling to dimuons offers an opportunity tostudythe Higgs interaction with second generation fermions. The Standard Model branching fraction of the Higgs decay to µ+µ− is 2.2 × 10−4, much smaller compared to the decays to the third generation lepton/quark pairs τ +τ − and b¯b, and the second generation quark pair cc¯. Despite the low branch- ing fraction, this channel has the highest trigger and particle identification efficiencies of the other listed decays as well as a comparatively small background. This makes this channel an attractive way to study the Higgs Yukawa coupling. The background to this channel is a dominant irreducible dimuon production from the Drell-Yan process, Z/γ∗ → µ+µ−, which is ≈ 1700 times the signal rate. To increase our detection sensitivity we use three categories to tag events by the Higgs produc- tion mechanism: gluon-gluon fusion (ggF), vector boson fusion (VBF), and vector boson associated production (VH). This talk presents the strategies of the analysis and summarizes the results from Run 1 and Run 2 data (2015-2016). The new developments in event categorization and the detection sensitivity for the expected 150 fb−1 data in Run 2 are also reported.
Quark and Lepton Flavor / 159
Results on D-mixing in CP-odd mode: D->Ksomega, omega->pi+pi- pi0 at Belle
Author: Minakshi Nayak1
1 Wayne State University
Corresponding Author: [email protected]
We report for the first time search for D-mixing in CP-odd mode using D->Ksomega, omega->pi+pi- pi0 using data sample corresponding to an integrated luminosity of 966 fb-1 collected by the Belle experiment at the KEKB asymmetric-energy e+e- collider. This decay mode is important as it has higher branching fraction than other CP-odd modes except Kspi0.
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Top Quark Physics / 160
Measurement of the cross section of the production of a top quark pair in association with a photon in pp collisions at 8 TeV
Author: Daniel Noonan1
1 Florida Institute of Technology
Corresponding Author: [email protected]
A measurement of the cross section of top quark pairs produced in association with a photon is presented. The data were collected by the CMS experiment in proton-proton collisions atacenter of mass energy of 8 TeV. The measurement is performed in the electron+jets and muon+jets final state. The fiducial cross section for top quark pair plus photon production is measured inthephase space corresponding to the semileptonic decay of the top quark pair with a 25 GeV photon, and is measured relative to the cross section of inclusive top quark pair production.
Higgs and EWSB / 161
A seach for a charged Higgs decaying into a top and a bottom quark with single leptonic, an electron or a muon, final state at 13 TeV
Author: JANGBAE LEE1
1 Brown University
Corresponding Author: [email protected]
A charged Higgs boson is predicted by many beyond the Standard Model theories. Among those, the two-Higgs-doublet model (2HDM) extends the standard model with two Higgs doublets. Especially type II model of 2HDM predicts five Higgs bosons, negative/positive charged Higgs pair and three neutral bosons including light and heavy scalar Higgs bosons, and a pseudoscalar Higgs boson. In this talk we present a search for a charged Higgs boson decaying into a top and a bottom quark with single leptonic, an electron or a muon, final state. The dataset analyzed correspond to aninte- grated luminosity of 35.86 fb-1 collected by CMS experiment at 13 TeV in proton-proton collisions in 2016.
Poster Session and Reception / 162
Measurement of PTFE Reflectance for Xenon Scintillation Light
Author: Yuhan Wang1 Co-author: Wolfgang Lorenzon 1
1 University of Michigan
Corresponding Author: [email protected]
The LUX-ZEPLIN (LZ) experiment is a next-generation direct detection experiment under construc- tion to search for dark matter. The detector contains a dual-phase liquid xenon (LXe) time projection chamber with a total active mass of 7 tons and is located at the Sanford Underground Research Facil- ity (SURF) in South Dakota. LZ takes advantage of the high VUV reflectivity of PTFE to achieve high
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light collection efficiency. Previous work has shown that thinner PTFE layers may reduce radiologi- cal backgrounds, and thus these are preferred so long as no significant loss in reflectance results. In this presentation, experimental results of the reflectance near wavelengths of 178 nm of thin PTFE, Kapton, and PEEK sheets immersed in LXe, conducted with the Michigan Xenon Detector (MiX), will be discussed. It is further planned to compare those measurements with light propagation simula- tions to estimate the absolute reflectance of these materials.
Neutrino Physics / 163
Improved Search for a Light Sterile Neutrino at Daya Bay, and Combined Analysis with MINOS and Bugey-3
Author: Matt Kramer1
1 UC Berkeley
Corresponding Author: [email protected]
Reactor neutrino experiments are well-suited for probing the existence of a light sterile neutrino in the region of a sub-eV2 mass splitting (largely unexplored until recently). Using eight functionally identical antineutrino detectors (ADs), the Daya Bay experiment measures the electron antineutrinos produced by six 2.9 GW commercial nuclear reactors located near Shenzhen, China. By combining 404 days of 8-AD data with 217 days of 6-AD data (previously reported), a sample of 1.2 million antineutrino candidates was used to test for oscillations to a sterile fourth neutrino in the mass range of 2 × 10−4 lesssim Dm241 2 lesssim0.3 eV . Joint fits were performed for θ13, θ14, and Dm241, dominated either by the ratio of the two near-hall spectra (for Dm241 gtrsim0.01 eV2) or the ratio of far to near-hall spectra (for smaller splittings). Independent fits were performed using two techniques, a covariance matrix approach and one using nuisance parameters, and limits were set using the Feldman-Cousins and CLs methods, respectively. The two methods were mutually consistent within expectation, and found no evidence for a sterile neutrino in the mass range considered. For Dm241 2 2 lesssim 0.2 eV , 95\% C.L. limits of sin 2θ14 lesssim0.01 were set, forming the most stringent constraints to date in this region. Going further, sensitivity was extended for 0.2 lesssim Dm241 lesssim2 eV2 by including the results of the Bugey-3 short-baseline reactor experiment in a com- bined reanalysis. Finally, the addition of MINOS acclerator neutrino data enabled strong constraints 2 2 2 to be set on sin 2θµe = 4|Ue4| |Uµ4| , which governs the strength of the anomalous short-baseline signals claimed by the LSND and MiniBooNE experiments. This three-experiment joint analysis ex- cludes the LSND/MiniBooNE allowed regions for Dm241 lesssim1˜eV2 at 90\% C.L., significantly constraining the allowed parameter space for a four-flavor explanation of the “anomaly.”
QCD / 164
Heavy Flavor measurements and production studies at CMS
Author: Jhovanny Mejia1
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1 Cinvestav Mexico City
Corresponding Author: [email protected]
Using data collected by the CMS experiment at the LHC, we performed precise measurements of decay properties of hadrons containing a b quark. The lifetime is a fundamental property of particles and an important observable in heavy hadrons physics. We measured this quantity for various b- hadrons at the precision of the world average. These measurements will allow to test QCD inspired theoretical models. We have also measured the differential prompt production cross sections of J/ψ, ψ(2S), and Υ(nS) (n = 1, 2, 3) vector mesons in pp collisions at 13 TeV. These results will contribute to consolidate the underlying hypotheses of NRQCD and provide further input to constrain the theory parameters.
Accelerators / 165
Beam Based RF Voltage Measurements at the Fermilab Booster (RCS) for Intensity Upgrade
Author: Chandra Bhat1
1 Fermilab
Corresponding Author: [email protected]
Fermilab Booster is the second oldest rapid cycling synchrotron (RCS) in the world. In the intensity frontier (IF) program of Fermilab, the Booster plays a critical role. Currently, (PIP-era) the Booster receives proton beam from the 400 MeV normal conducting LINAC and accelerates the beam to 8 GeV using its twenty RF stations that are distributed around the ring. The main dipole magnets of the Booster cycle at 15 Hz and follow a sinusoidal magnetic ramp. During the PIP-II era, this cycle rate will be increased to 20 Hz and a higher intensity beam (>1.5 times higher than the PIP intensity) will be injected from a superconducting LINAC. The required accelerating RF voltage during PIP-II era will need to be about 30% more than during the PIP era. Therefore, it is extremely important to find out the current RF voltage by carrying out beam-based measurements to specify the needed upgrades to the Booster RF system. During the beam cycle the magnetic field is changing all the time. Due to this, 1) measuring/calibrating the RF voltage used for beam capture and acceleration, 2) longitudinal beam tomography, are not trivial tasks. Here we present a method to accomplish both tasks near injection and extraction energies of the Booster. Python/Matlab programs* have been developed which use wall current monitor data to measure synchrotron frequencies and extract the RF voltage with an accuracy of 13% at injection and 7% at extraction. We have also attempted to obtain the beam tomography in the longitudinal phase space using these data. The method developed here is applicable to any similar RCSs in the world. *The author would like to thank Shreyas Bhat from the Fermilab Computing Division for hisinvolve- ment in developing a necessary Python program for the data analyses. Work supported by Fermi Research Alliance, LLC under Contract No. De-AC02 07CH11359 with the United States Department of Energy
Quark and Lepton Flavor / 166
Measuring the b-tagging Efficiency in ATLAS
Author: Rachael Creager1
1 University of Pennsylvania
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Corresponding Author: [email protected]
The identification of jets containing b hadrons is essential for many different searches andmeasure- ments on ATLAS. A calibration of the b-jet identification efficiency is presented for several different algorithms, using data collected by the ATLAS detector in 2016 corresponding to an integrated lu- minosity of 11.6 \fb of proton-proton collisions at a center-of-mass energy of 13 TeV. The calibration technique relies on a sample of jets containing a muon with the jet cone, where the component of the muon momentum perpendicular to the jet axis provides an effective discriminant on a statisti- cal basis for distinguishing jets originating from bottom quarks from jets originating from charm quarks, light flavor quarks or gluons.
Neutrino Physics / 167
Measurement of Neutrino Flux In The DUNE Near Detector
Author: Hongyue Duyang1
1 university of south carolina
Corresponding Author: [email protected]
The Deep Underground Neutrino Experiment (DUNE) is the next generation neutrino oscillation experiment designed to measure neutrinos’ mass ordering and CP violation. The near detector (ND), located at Fermilab, will provide crucial constraints on the systematic uncertainties to the oscillation measurements. This talk focuses on the measurement of neutrino flux in the DUNE near detector, including both the absolute flux and the relative flux (energy shape). Leptonic processes withwell known cross-sections such as neutrino-electron elastic scattering and inverse-muon-decay provide precise measurement of the absolute neutrino flux. The relative flux can be measured by theLow-Nu method using neutrino and antineutrino data with small hadronic energy.
Cosmology and Astrophysics / 168
Fundamental Physics from SZ Cluster Surveys with CMB and Op- tical Lensing Mass Calibration
Author: Mathew Madhavacheril1
1 Princeton University
Corresponding Author: [email protected]
Future high resolution CMB experiments will detect tens of thousands of galaxy clusters. The abun- dance of clusters as a function of mass and redshift allows us to map the growth of structure and consequently measure the sum of neutrino masses and constrain the nature of dark energy. Such measurements are currently limited by our ability to calibrate the masses of galaxy clusters. Planned CMB experiments will be sensitive enough to offer competent mass calibration from CMB lensing that is complementary to optical weak lensing of galaxies. I will review and compare the prospects of CMB and optical mass calibration, discussing this in the context of methods applied to ongoing CMB experiments like Advanced ACT, and focusing on systematics such as contamination from astrophysical foregrounds.
Cosmology and Astrophysics / 169
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Delensing CMB B-modes: results from SPT.
Author: Kimmy Wu1
1 UC Berkeley
Corresponding Author: [email protected]
A promising signature of cosmic inflation is the presence of a “B-mode” component in the polariza- tion of the Cosmic Microwave Background (CMB) induced by primordial gravitational waves. For many inflation models, this B-mode signal is predicted to be at a level detectable in the nearfuture. However, current searches are limited by a “lensing B-mode” component that is produced by grav- itationally lensed primordial E modes. In order to potentially detect the inflationary signal from B-mode measurements, lensing B modes must be characterized and removed in a process referred to as “delensing.” This process has been studied extensively theoretically and with simulations, but has not been performed on polarization data. In this talk, we present the results of CMB B-mode delensing using polarization data from the South Pole Telescope polarimeter, SPTpol. Furthermore, using realistic simulations that include filtering and realistic CMB noise, we will show what is currently limiting the delensing efficiency and how it will rapidly improve in the near fu- ture.
Top Quark Physics / 170
A Boosted Event Shape Tagger for Heavy Object Classification
Authors: John Conway1; Justin Pilot2; Maia Paddock1; Ramya Bhaskar1; Robin Erbacher Erbacher1
1 UC Davis 2 University of California, Davis
Corresponding Author: [email protected]
We present a novel approach to the problem of discriminating jets produced from the hadronic decays of highly-boosted heavy particles (top, W, Z, H) from light jets. By hypothesizing different particle origins for the jets and boosting all jet constituents into the corresponding rest frames, angular and kinematic distributions of reconstructed particles can be used to discriminate 2- or 3-prong topolo- gies from those of light jets produced in QCD processes. Machine learning techniques are utilized to build discriminants capable of simultaneously separating and classifying the particle species. This approach adds additional information relative to existing techniques, thereby improving sensitivities of analyses dependent on such heavy-object tagging tools. We demonstrate the performance of this tagging method and provide a proof-of-principle application to a simple analysis scenario.
Neutrino Physics / 171
Perturbative charm production and the prompt atmospheric neu- trino flux in light of RHIC and LHC
Author: INA SARCEVIC1
1 UNIVERSITY OF ARIZONA
Corresponding Author: [email protected]
We evaluate the high energy prompt atmospheric neutrino flux using three different frameworks for calculating the heavy
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quark production cross section in QCD: NLO perturbative QCD, kT factorization including low-x resummation, and the dipole model including parton saturation. We determine QCD parameters, such as the charm quark mass, factorization and renormalization scales that provide the best description of the total charm cross section measured at fixed target experiments, at RHIC and at LHC as well as the best description of the differential cross sections for charm and bottom production compared with the latest data on forward charm meson production from LHCb at 7 TeV and at 13 TeV. We include nuclear effects and we find the reduction of the flux due to nuclear effects to range from 10% to 50% at the highest energies. Finally, we compare our results with the IceCube limit on the prompt neutrino flux, which is already providing valuable information about some of the QCD models.
Cosmology and Astrophysics / 172
Constraints on the astrophysical flux and the dark matter decay with IceCube HESE data
Author: INA SARCEVIC1
1 UNIVERSITY OF ARIZONA
Corresponding Author: [email protected]
The IceCube detection of High Energy Starting Events (HESE) and the upward muon track events (6 year data) are presently hard to explain with the single power-law astophysical flux for energies above 30TeV. We investigate the possibility that a significant component of the additional neutrino flux originates due to the decay of a very heavy dark matter particle via several possible channels into standard model particles. We perform a full 4 parameter fit to IceCube data in which we vary astrophysical flux normalization, power-law index, dark matter mass, dark matter lifetime and dark matter decay mode. We show that that dark matter with mass in the PeV range and the lifetime around 10ˆ27s provides much better fit to IC data than the best-fit astrophysical flux alone. We also find dark matter lifetime limits which are much stronger that those obtained from gamma-ray data for all channels except b¯b, which is also disfavored by the IceCube HESE data.
Diversity, Education, and Outreach / 173
VENu: The Virtual Environment for Neutrinos
Author: Marco Del Tutto1
1 University of Oxford
Corresponding Author: [email protected]
The Virtual Environment for Neutrinos (VENu) is a virtual reality-based visualization oftheMi- croBooNE detector. MicroBooNE is a liquid-argon-based neutrino experiment, which is currently
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operating in Fermilab’s Booster neutrino beam. The new VENu smartphone app provides informative explanations about neutrinos and usesreal MicroBooNE neutrino data that can be visualized inside a virtual representation of the MicroBooNE detector. Available for both iOS and Android, the VENu app can be downloaded for free from the Ap- ple and Google marketplaces. The app enables users to immerse themselves inside the MicroBooNE particle detector and to see particle tracks inside. This can be done in Virtual Reality mode, where the users can pair their smartphone with any consumer virtual reality headset and see the detector in 3D. To encourage learning in a fun environment, a game is also available. The game guides users to learn about neutrinos and how to detect them. They can also try to “catch” neutrinos themselves in 3D mode. The app is currently being pursued for a QuarkNet neutrino master class and outreach events at several universities and labs worldwide.
Precision Electroweak Physics / 174
Measurement of same-sign WW diboson production with the AT- LAS experiment
Author: Will DiClemente1
1 University of Pennsylvania
Corresponding Author: [email protected]
We present a study of same-sign W±W± boson pairs produced in association with two or more jets in pp collisions at √s = 13 TeV. Same-sign W±W± production is sensitive to the mechanism of elec- troweak symmetry breaking and physics beyond the standard model, particularly through vector boson scattering (VBS) production. Unlike opposite-sign WW production, in same-sign W±W± pro- duction the electroweak mediated diagrams are comparable in size to the QCD mediated diagrams, making it well suited for VBS studies. An inclusive cross section measurement of both the elec- troweak and QCD same sign W±W± processes is performed using leptonically decaying W± bosons with electrons and/or muons in the final state. The first evidence of of same sign W±W± production was seen by the ATLAS collaboration in 20.3 fbˆ-1 of 8 TeV data, seeing an excess in data of 3.6σ over backgrounds. We expect greater sensitivity with the 36 fbˆ-1 of 13 TeV data collected by ATLAS in 2015 and 2016.
Poster Session and Reception / 175
Muon Intensity Increase by Wedge Absorbers
Author: David Neuffer1
Co-author: Diktys Stratakis 2
1 Fermilab 2 Fermi National Accelerator Laboratory
Corresponding Author: [email protected]
Low energy muon experiments such as mu2e and g-2 have a limited energy spread acceptance. Fol- lowing techniques developed in muon cooling studies and the MICE experiment, the number of muons within the desired energy spread can be increased by the matched use of wedge absorbers. More generally, the phase space of muon beams can be manipulated by absorbers in beam transport lines. Applications with simulation results are presented.
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Neutrino Physics / 177
Design of the LBNF Beamline
Author: Jim Hylen1
1 Fermi National Accelerator Laboratory
Corresponding Author: [email protected]
The Long Baseline Neutrino Facility (LBNF) will utilize a beamline located at Fermilab to provideand aim a neutrino beam of sufficient intensity and appropriate energy range toward DUNE detectors, placed deep underground at the Sanford Underground Research Facility (SURF) in South Dakota. The primary proton beam (60-120 GeV) will be extracted from the MI-10 section of Fermilab’s Main Injector. Neutrinos are produced after the protons hit a solid target and produce mesons whichare subsequently focused by magnetic horns into a 194m long decay pipe where they decay into muons and neutrinos. The parameters of the facility were determined taking into account the physics goals, spacial and radiological constraints and the experience gained by operating the NuMI facility at Fermilab. The Beamline facility is designed for initial operation at a proton-beam power of1.2MW, with the capability to support an upgrade to about 2.4 MW. LBNF/DUNE obtained CD-1 approval in November 2015. We discuss here the design status and the associated challenges as well as the R&D and plans for improvements before baselining the facility.
Neutrino II / 178
Selection of charged-current muon-neutrino and electron-neutrino interactions in the DUNE far detector
Authors: Dominic Brailsford1; Michael Wallbank2; Tingjun Yang3; Tyler Alion4
1 Lancaster University 2 University of Sheffield 3 FNAL 4 Fermilab
Corresponding Author: [email protected]
The Deep Underground Neutrino Experiment (DUNE) is a next generation long-baseline neutrino experiment whose primary physics goals include measurement of the charge-parity violating phase delta(CP) and determination of the neutrino mass ordering. The DUNE experiment’s far site will house four 10 kt liquid argon time projection chambers which will measure the event rates of intrin- sic muon-neutrino and oscillated electron-neutrino charged-current interactions from Fermilab’s long-baseline neutrino facility beam to achieve these goals. This talk describes developments and characterisation of reconstruction-based multi-variate analyses to select such events.
Particle Detectors / 179
Near-Infrared Scintillation of Liquid Argon
Author: Carlos Escobar1 Co-author: Paul Rubinov 2
1 Fermilab and UNICAMP 2 Fermilab
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Corresponding Author: [email protected]
After briefly reviewing past attempts to observe and measure the scintillation of condensed noble gases in the near-infrared (NIR), we outline the prospects and advantages of using the NIR scintil- lation as the light signal in liquid argon time projection chambers. We conclude with preliminary results obtained at Fermilab’s Proton Assembly Building cryogenic facilities.
Dark Matter / 180
Search for invisible decay of a dark photon produced in e+e− col- lisions at BaBar
Author: Frank Porter1
Co-author: - BaBar Collaboration 2
1 Caltech 2 -
Corresponding Authors: [email protected], [email protected]
We report on a search for single-photon events in 53 fb−1ofeˆ+eˆ- collisiondatacollectedwiththeBaBardetectorattheP EP − IIB−factory.W elookforeventswithasinglehigh−energyphotonandalargemissingmomentumandenergy, consistentwithproductionofaspin− 1particleA’throughtheprocesseˆ+eˆ- \to \gamma A’,A’ \to invisible.Suchparticles, referredtoas“darkphotons”, aremotivatedbytheoriesapplyingaU(1)gaugesymmetrytodarkmatter.W efindnoevidenceforsuchprocessesandset90%confidencelevelupperlimitsonthecouplingstrengthofA’ \to eˆ+eˆ-foradarkphotonwithamasslowerthan8GeV.Inparticular, ourlimitsexcludethevaluesoftheA’$ coupling suggested by the dark-photon interpretation of the muon (g-2) anomaly, as well as a broad range of parameters.
Dark Matter / 181
Search for muonic dark force at BABAR
Author: Frank Porter1
Co-author: - BaBar Collaboration 2
1 Caltech 2 -
Corresponding Authors: [email protected], [email protected]
Many models of New Physics postulate the existence new gauge bosons mediating interactions be- tween “dark sectors” and the Standard Model. We present a search for a dark boson Z’ coupling only to the second and third generation of leptons in the reaction e+e- -> mu+mu-Z’, Z’ -> mu+mu- with the full BABAR dataset. No significant signal is observed and limits improving upon bounds derived from neutrino experiments are set.
QCD / 182
Recent measurements of exclusive hadronic cross sections at BABAR and the implication for the muon g-2 calculation
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Author: Frank Porter1
Co-author: - BaBar Collaboration 2
1 Caltech 2 -
Corresponding Authors: [email protected], [email protected]
The BABAR Collaboration has an intensive program studying hadronic cross sections in low-energy e+e− annihilations, which are accessible with data taken near the Upsilon(4S) via initial- state radiation. Our measurements allow significant improvements in the precision of the predicted value of the muon anomalous magnetic moment. These improvements are necessary for shedding light on the current ˜3sigma difference between the predicted and the experimental values. We have previously published results on a number of processes with two to six hadrons in the final state. We report here on several recent measurements of hadronic cross sections in e+e− annihilations.
QCD / 183
Precise measurements of the mass differences between the D∗(2010)+, and the D+ and D0 mesons with the BaBar detector
Author: Frank Porter1
Co-author: - BaBar Collaboration 2
1 Caltech 2 -
Corresponding Authors: [email protected], [email protected]
We present a high precision measurement of the mass difference between the D∗(2010)+ and D+ mesons using the decay chain D∗(2010)+ → D+π0, with D+ → K−π+π+ . The analysis has been performed on a data sample corresponding to an integrated luminosity − of about 477 fb 1, collected with the BaBar detector at the PEP-II e+e- collider. We additionally combine this result with a previous BaBar measurement of m(D∗(2010)+) − m(D0) to extract the mass difference between the charged and neutral D mesons. We obtain results that are approximately seven times more precise than the present world aver- ages.
Beyond Standard Model / 184
Search for the Lepton Flavor Violating Decay Υ(3S) → e±µ∓
Author: Frank Porter1
Co-author: - BaBar Collaboration 2
1 Caltech 2 -
Page 62 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Corresponding Authors: [email protected], [email protected]
Charged lepton flavor violating processes are unobservable in the standard model, but they are predicted to be enhanced in several new physics extensions. Data collected with the BaBar detector at the SLAC PEP-II e+e− collider at a center-of-mass energy of 10.36˜GeV were used to search for electron-muon flavor violation in Υ(3S) → e±µ∓ decays. The search was conducted using a data sample in which 118 million Υ(3S) mesons − were produced, corresponding to an integrated luminosity of 27˜[fb 1.
Dark Matter / 186
Flavored Dark Matter and a Secret Asymmetry
Author: Can Kilic1
1 University of Texas at Austin
Corresponding Author: [email protected]
I will present a mechanism where the dark matter abundance arises from asymmetries generated in the early universe, even though the distribution of dark matter may appear symmetric today. This mechanism can be realized in the framework of of flavored dark matter, among others.Iwill discuss the experimental signatures of this setup, as well as generic phenomenological features of the flavored dark matter scenario that set it apart from single-flavor darkmatter.
Particle Detectors / 187
Gain stabilization of Silicon Photomultipliers and Afterpulsing
Author: Gerald Eigen1
1 University of Bergen
Corresponding Author: [email protected]
The gain of silicon photomultipliers (SiPMs) increases with bias voltage and decreases with temper- ature. To operate SiPMs at stable gain, the bias voltage can be adjusted to compensate temperature changes. We have tested this concept with 30 SiPMs from three manufacturers (Hamamatsu, KETEK, CPTA) in a climate chamber at CERN varying the temperature from 1℃ to 50℃. We built an adaptive power supply that used a linear temperature dependence of the bias voltage readjustment. With one selected bias voltage readjustment, we stabilized four SiPMs simultaneously. We fulfilled our goal of limiting the deviation from gain stability in the 20℃-30℃ temperature range to less than ±0.5% for most of the tested SiPMs. We have studied afterpulsing of SiPMs for different temperatures and bias voltages.
Quark and Lepton Flavor / 188
Pure and semi-leptonic decays of D(s) at BESIII
Author: Huijing Li1
Page 63 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
1 IHEP
Corresponding Author: [email protected]
The world’s largest e+e- collision samples at Ecm = 3.773, 4.009, 4.178,and 4.6 GeV have been accumulated at BESIII. By analyzing the decays of D(s)+ -> l+v (l=mu, tau) and D(s) -> (P/V) l+ v (l=e, mu), we report the determinations of CKM matrix elements |Vcs(d)|, the D(s)+ decay constants fD(s)+, the form factors fˆK/pi_+(0) of D semi-leptonic decays. These are important to calibrate the LQCD calculations of fD(s)+ and fˆK/pi_+(0) and to test the CKM unitarity, and determine the eta-eta’ mixing angle. In the partial wave analysis of the decay D+ -> K- pi- e + v, we find that the dominant bar{K}*(892)0 component is accompanied by an S-wave contribution. This analysis also allows us to extract the helicity basis form factor of the resonance in a model-independent way. Also, for the first time, we search for D+ -> gamma e+ v and D+ ->D0e+v as well as for D -> a0(980) e+ v.
Quark and Lepton Flavor / 189
Hadronic decays of D(s) at BESIII
Author: Bai-Cian Ke1
1 BESIII (Carnegie Mellon University)
Corresponding Author: [email protected]
With 2.93/fb and 3.19/fb e+e- annihilation samples taken at Ecm = 3.773 and 4.178 GeV, respectively, we perform amplitude analyses of D0 -> 4-body. We also measure the CP asymmetries of D+ -> K_(S/L) K+ (pi0) and y_CP based on D0 -> K_(S/L) pi0 (pi0). Additionally, we report measurements of branching fractions for D(s)(0+) -> hh(+), h0h0h0, and final states that contain two K_Ss.
Quark and Lepton Flavor / 190
Study of Lambda_c decays at BESIII
Author: Hajime Muramatsu1
1 University of Minnesota
Corresponding Author: [email protected]
BESIII collected about 567 pb-1 of e+e- annihilation data at Ecm = 4.6 GeV which is close to the mass threshold of Lambda_c pair. By employing this unique data set, we determine the absolute branching fractions for 18 decays of charmed baryon Lambda_c for the first time with much improved precision, which are important for both charmed baryons and B physics. We also report observations of other hadronic and semi-leptonic decays, such as Lambda_c+ -> n K_S pi+ and Lambda_c -> p pi+ pi-. The former provides the first complementary data to the previously measured decays involvinga proton. Additionally, we look for some inclusive hadronic and semi-leptonic final states in Lambda_c decays.
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Beyond Standard Model / 191
Search for production of supersymmetric particles in final states with missing transverse momentum and multiple b-jets at s√=13˜TeV proton-proton collisions with the ATLAS experiment
Authors: David Miller1; Giordon Stark1; Maximilian Swiatlowski1
1 University of Chicago
Corresponding Author: [email protected]
A search for supersymmetry involving the pair production of gluinos decaying via third-generation squarks to the lightest neutralino (χ̃ 10) is reported. It uses LHC proton-proton collision data at a center-of-mass energy s√=13 TeV, corresponding to an integrated luminosity of 36 ifb collected with the ATLAS detector in 2015 and 2016. The search is performed in events containing large missing transverse momentum and several energetic jets, at least three of which must be identified as originating from b-quarks, and are also used to form large-R jets using jet reclustering. To increase sensitivity, the sample is further divided depending on the presence or absence of electrons or muons. No excess is found above the predicted background. For χ̃10 masses below approximately 200 GeV, gluino masses of less than 2.0 (1.9) TeV are excluded at the 95% CL in simplified models of the pair-production of gluinos decaying via top (bottom) squarks. An interpretation of the limits in terms of the branching ratios of the gluinos in third generation squarks is also provided. These results significantly extend the exclusion limits obtained with the 3.2 fb−1 of data collected in2015, with the exclusion limit on the gluino mass extended by up to 250 GeV for the case of massless neutralinos.
Computing, Analysis Tools, and Data Handling / 192
The Calorimeter Global Feature Extractor (gFEX) for the Phase-I Upgrade of the ATLAS experiment
Authors: David Miller1; Giordon Stark1; Reina Camacho1
1 University of Chicago
Corresponding Author: [email protected]
The ATLAS Level-1 calorimeter trigger is planning a series of upgrades in order to face thechallenges posed by the upcoming increase of the LHC luminosity. The upgrade will benefit from the new front end electronics for parts of the calorimeter which provide the trigger system with digital data with a tenfold increase in granularity. The Global Feature Extractor (gFEX) module is one of the updatesof the Level-1 calorimeter trigger project. This unique single ATCA board will use 3 processor Xilinx Ultra-scale FPGAs for data processing and one Xilinx Ultra-scale+, multi-processor system-on-chip, ZYNQ, for configuring all of the processor FPGAs and monitoring the board status and environment. It will allow the identification in real time of large radius jets for capturing Lorentz-boosted objects such as top quarks, Higgs, Z and W bosons, as well as the calculation of global event variables such as missing transverse energy, centrality for heavy ion collisions and event-by-event pile-up subtraction which are fundamental for the LHC physics studies. Extensive simulation studies are carried out to understand and optimise the characteristics of gFEX. Prototypes have been built and extensively tested to prepare for the final steps and the production of the modules. The design of the finalgFEX module as well as the performance of the prototypes will be presented.
Poster Session and Reception / 193
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Testing, Installation, Integration and Performance Studies of a Cosmic Ray Tagging System for the Short Baseline Neutrino Pro- gram Far Detector (ICARUS)
Author: Christopher Hilgenberg1 Co-authors: Anne Schukraft 2; David Warner 1; Robert Wilson 1
1 Colorado State University 2 Fermilab
Corresponding Author: [email protected]
The ICARUS T600 liquid argon time-projection chamber will be the far detector for the ShortBase- line Neutrino Program. The detector will operate at shallow depth and therefore be exposed tothe full surface flux of cosmic rays. Application of overburden attenuates most of this background ex- pected for muons. However, the remaining background is problematic since a photon produced by a muon passing in close proximity to the T600 active volume can be mistaken for a neutrino event. In principle, a large fraction of these events can be removed from the data through application of selection cuts as suggested by Monte Carlo studies. However, this method of background rejection reduces fiducial target mass and renders analysis of the systematics difficult. A straightforward way to remove the cosmic muon background more thoroughly is to utilize a detector external to the liquid argon active volume capable of tagging thoroughgoing cosmic muons with high efficiency (e.g. > 95\%). Ideally, this external cosmic ray tagger (CRT) would provide full geometric coverage of the T600. During the past 18 months at Colorado State University (CSU), we performed Monte Carlo studies of the tagging efficiencies of the system and conducted an extensive research and development program of such a system based on extruded organic scintillator, wavelength- shifting fibers, and silicon photomultipliers. Subsequently, it was decided that our European col- leagues would design and construct the top portion of the CRT while the US groups would provide the side (˜400 mˆ2) and bottom (˜215 mˆ2) portions using salvaged MINOS veto shield modules onthe sides and Double Chooz veto modules on the bottom. These two systems will need to be tested for basic functionality and to have their detailed response characterized in order to optimize the system configuration as well as prepare for future analysis tasks and integration with the other detector sub-systems.
Neutrino Physics / 194
Measurement of Neutral Current Coherent Pi0 Production In The NOvA Near Detector
Author: Hongyue Duyang1
1 university of south carolina
Corresponding Author: [email protected]
The NOvA experiment is a long-baseline neutrino oscillation experiment designed to measure elec- tron neutrino appearance in a muon neutrino beam. It consists of two finely segmented, liquid scintillator detectors at 14 mrad off-axis in the NuMI beam.The NOvA Near Detector, located atFer- milab, provides an excellent opportunity to study neutrino-nucleus interactions which are important for the neutrino oscillation measurements. This talk will present one of the first such measurements from the NOvA Near Detector: neutral current coherent-Pi0 production. Neutrinos can coherently interact with the target nucleus via neutral current exchange and produce a single, forward Pi0, which is a background to the NuE appearance measurement. This analysis measures the coherent- Pi0 kinematics and cross-section and compares it to the model predictions. A data-driven method is developed to constrain the neutral current resonance and deep-inelastic pi0 productions which are background to this analysis.
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Poster Session and Reception / 195
LBNF Optimized Horn Design & Target Integration
Author: Cory Crowley1
Co-authors: Ang Lee 2; Chris Densham 3; Joe Odell 4; Patrick Hurh 5; Zhijing Tang 2; tristan davenne 6
1 Fermi National Accelerator Lab 2 Fermilab 3 STFC Rutherford Appleton Laboratory 4 STFC 5 FNAL 6 stfc
Corresponding Author: [email protected]
Optimization efforts for the Long Baseline Neutrino Facility (LBNF) have been pursued as anoppor- tunity to further expand the reach of the experiment in the energy spectrum, and to significantly increase neutrino flux to the detectors. Major improvements and subsequent reconfigurations have been completed to the horn focusing system, in addition to the target, achieving the goals set forth. The optimized design is proposed as a three-horn system, with the graphite target now integrally supported within the primary horn, Horn A. Secondary and tertiary horns have been enlarged to increase pion gathering and maximize the potential of the near site facilities. Preliminary thermal and structural analysis for critical components will be presented, in conjunction with conceptual target layout and overall system operation.
Neutrino II / 196
Design and Fabrication of the ProtoDUNE Dual Phase LArTPC
Author: ANIMESH CHATTERJEE1
1 The University of Texas at Arlington
The WA105 protoDUNE Dual Phase Liquid-argon Time Projection Chamber (LArTPC) isalarge demonstrator based on the GLACIER design, with a 6x6x6 m3 (a Dual-phase LArTPCs are one of the far detector technology options foreseen for the Deep Underground Neutrino Experiment (DUNE) at Fermilab. Dual Phase (DP) refers to the extraction of ionization electrons at the interface between liquid and gaseous argon and their amplification and collection in the gas phase. ProtoDUNE will be operating at the CERN neutrino platform test beam facility. It not only serves as the engineering prototype of the FD, but will also demonstrate the concept of a very large dual-phase LAr TPC and calibrate it with charged particle test beam. We will briefly discuss the actual dimension of the design, fabrication, testing, installation and commissioning of the detector components at CERN.
Poster Session and Reception / 197
A Minimal non-universal EW extension of the Standard Model: A chiral family of models
Author: Richard Benavides1
Co-authors: Eduardo Rojas 2; Luis Muñoz 1; Oscar Rodriguez 2; William Ponce 2
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1 Instituto Tecnológico Metropolitano 2 Universidad de Antioquia
Corresponding Author: [email protected]
We report the most general expression for the chiral charges of a non-universal U(1)’ with identical charges for the first two families but different charges for the third one. The model is minimal inthe sense that only standard model fermions plus right-handed neutrinos are required. By imposing anomaly cancellation and constraints coming from Yukawa couplings we obtain two different solutions. In one of these solutions, the anomalies cancel between fermions in different families. These solutions depend on four independent parameters which result very useful for model building. We build different bench- mark models in order to show the flexibility of the parameterization. We also report LHC and low energy constraints for these benchmark models.
Diversity, Education, and Outreach / 198
Exploring Cosmic Rays with a High School Student Global Detec- tor
Author: Mark Adams1
1 Fermilab
The QuarkNet program has distributed over five hundred cosmic ray detectors for use inhighschools and research facilities throughout the world over the last decade. Students collect data, share it with all QuarkNet users, and perform analyses using web-based tools. Since muons fall on everyone in the world, all students can experience this high energy particle environment. Taking steps toward a world-wide collaboration, QuarkNet sponsors International Muon Week and participates in Interna- tional Cosmic Day, where users collect similar data together. This summer, many North American groups plan to construct telescopes to measure cosmic ray activity during the solar eclipse. Along with IPPOG cosmic ray outreach efforts, we are building a global collaboration.
Poster Session and Reception / 199
The Mu2e Solenoid Cold Mass Position Monitor System
Author: Thomas Strauss1 Co-authors: Horst Friedsam 1; Michael Lamm 2; Sandor Feher 2; Tom Nicol 2; Tom Page 2
1 FNAL 2 Fermilab
Corresponding Author: [email protected]
The Mu2e experiment at Fermilab is designed to search for charged-lepton flavor violation bylook- ing for muon to electron conversions in the field of the nucleus. The concept of the experiment isto generate a low momentum muon beam, stopping the muons in a target and measuring the momen- tum of the conversion electrons. The implementation of this approach utilizes a complex magnetic field composed of graded solenoidal and toroidal fields. The location of the solenoid cold massrela- tive to external fiducials are needed for alignment as well as monitoring coil movements during cool down and magnet excitation. This paper describes a novel design of a Cold Mass Position Monitor System that will be implemented for the Mu2e experiment.
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Poster Session and Reception / 200
A Study of Mass Matrices with Permutational Symmetry for Quark Families
Author: Richard Holmes1
1 Boeing Company
Corresponding Author: [email protected]
A set of 3x3 mass matrices are identified that have eigenstates that are mathematically equivalent to conventional QCD color states, and which have mass eigenvalues equal to the three quark flavor masses, for each of the two quark families. When integrated into the Dirac equations for each family, one obtains a theory that satisfies, TCP, Lorentz, U(1), and SU(2)L transformations, as well as parity and charge conjugation. With this approach, one obtains 3 degenerate mass eigenstates per color and flavor, which permits a unique and accurate fit of the CKM matrix, and a physical rationaleis provided. SU(3) is not automatically satisfied for the mass terms in this theory. This is addressed by using an SU(3) Higgs mechanism, which is complementary with SU(2)L in creating mass in this theory for quarks.
Higgs and EWSB / 201
Radiative Decays of the Higgs Boson to a Pair of Fermions
Authors: Tao Han1; Xing Wang2
1 Univ. of Pittsburgh 2 University of Pittsburgh
Corresponding Author: [email protected]
We revisit the radiative decays of the Higgs boson to a fermion pair h → ffγ¯ where f denotes a fermion in the Standard Model (SM). We include the chirality-flipping diagrams via the Yukawa O 2 couplings at the order (yf α), the chirality-conserving contributions via the top-quark loops of O 2 3 O 4 the order (yt α ), and the electroweak loops at the order (α ). The QED correction is about 2 × Qf calO(1%) and contributes to the running of fermion masses at a similar level, which should be taken into account for future precision Higgs physics. The chirality-conserving electroweak-loop processes are interesting from the observational point of view. First, the branching fraction of the radiative decay h → µ+µ−γ is about a half of that of h → µ+µ−, and that of h → e+e−γ is more than four orders of magnitude larger than that of h → e+e−, both of which reach about 10−4. The branching fraction of h → τ +τ −γ is of the order 10−3. All the leptonic radiative decays are potentially observable at the LHC Run 2 or the HL-LHC. The kinematic distributions for the photon energy or the fermion pair invariant mass provide non-ambiguous discrimination for the underlying mechanisms of the Higgs radiative decay. We also study the process h → ccγ¯ and evaluate the observability at the LHC. We find it potentially comparable to the other related studies and better than the h → J/ψ γ channel in constraining the charm-Yukawa coupling.
Poster Session and Reception / 202
Search for vector-like quarks in fully hadronic final states with the ATLAS detector
Author: Madhuranga Thilakasiri Madugoda Ralalage Don1
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1 Oklahoma State University
Corresponding Author: [email protected]
This poster is presenting a search for pair produced vector-like quarks decaying in to a fully hadronic final state using 36.1 fb−1 of pp collisions with a center of mass energy of 13 TeV collectedbythe ATLAS experiment. We consider the decays of pair produced T and B vector-like quarks in to third generation standard model quarks with Higgs boson and gauge bosons W and Z. The analysis uses the variable radius re-clustering algorithm to reconstruct the large-radius jets and a multi-class deep neural network is used to tag the jets as hadronically-decaying top quarks, Higgs bosons, W bosons or Z bosons.
Beyond Standard Model / 203
A search for B-L R-parity-violating scalar top decays in √s=13 TeV pp collisions with the ATLAS experiment
Authors: Brett Jackson1; Evelyn Thomson1; Giuseppe Lerner2; Iacopo Vivarelli2; Ian Dyckes1; Jeff Dandoy1; Kerim Suruliz2; Leigh Schaefer1
1 University of Pennsylvania 2 University of Sussex
Corresponding Author: [email protected]
A search is presented for the direct pair production of scalar tops, which decay through an R-parity- violating coupling to a final state with two leptons and two jets, at least one of which is identified as a b-jet. The dataset consists of an integrated luminosity of 36 fb−1 of proton-proton collisions at a center-of-mass energy of √s=13 TeV, collected over 2015 and 2016 by the ATLAS detector at the LHC. No significant excess over the Standard Model expectation is observed and 95% confidence- level limits are set for various branching fractions of the scalar top decay to an electron, muon, or tau with a b-quark.
Neutrino II / 204
JSNS2: A sterile neutrino search in Japan
Author: Joshua Spitz1
1 University of Michigan
Corresponding Author: [email protected]
A set of possible observations of neutrino oscillations at short distances may be indicative of a new neutrino. The resolution of these anomalies with explanation has been identified by the neutrino community as one of its most important near/mid-term goals. The J-PARC Sterile Neutrino Search at the J-PARC Spallation Neutron Source (JSNS2) experiment will directly address these anomalies and will also be able to make precision measurements of monoenergetic muon neutrinos from charged kaon decay-at-rest for the first time. The experiment, which will employ 50 tons of liquid scintillator, will also provide much needed research and development relevant for a number of next generation projects. This talk will introduce JSNS2 and present the status of the experiment on the waytofirst data in late-2018.
Neutrino Physics / 205
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Measurement of Neutrino-Electron Elastic Scattering at NOvA Near Detector
Author: Jianming Bian1
1 University of California, Irvine
Corresponding Author: [email protected]
NOvA is a long-baseline accelerator-based neutrino oscillation experiment that is optimized for electron-neutrino appearance measurements. It uses the upgraded NuMI beam from Fermilab and consists of a Far Detector in Ash River, Minnesota and a Near Detector at Fermilab. An accurate pre- diction of the neutrino flux is key to both oscillation and cross-section measurements. The precisely known neutrino-electron elastic scattering cross section provides an in situ constraint on the abso- lute flux. This talk discusses the status of the measurement of the rate of neutrino-electron elastic scattering in the NOvA Near Detector.
Quark and Lepton Flavor / 206
Lepton-flavour violation in a Pati-Salam model with gauged flavour symmetry
Authors: Christof Luhn1; Paul Moch1; Thorsten Feldmann1
1 Theoretische Physik 1, University of Siegen
Corresponding Author: [email protected]
Combining Pati-Salam (PS) and flavour symmetries in a renormalisable setup, we devise a scenario which produces realistic masses for the charged leptons. Flavour-symmetry breaking scalar fields in the adjoint representations of the PS gauge group are responsible for generating different flavour structures for up- and down-type quarks as well as for leptons. The model is characterised by new heavy fermions which mix with the Standard Model quarks and leptons. In particular, the partners for the third fermion generation induce sizeable sources of flavour violation. Focusing on the charged-lepton sector, we scrutinise the model with respect to its implications for lepton-flavour violating processes such as µ → eγ, µ → 3e and muon conversion in nuclei.
Poster Session and Reception / 207
CosmicWatch: the Desktop Muon Detector
Author: Spencer Axani1
Co-author: Janet Conrad 1
1 MIT
Corresponding Author: [email protected]
The CosmicWatch Desktop Muon Detectors were designed as an outreach tool to promote particle physics to undergraduates and high-school students. The detectors are pocket-sized, self-contained, light-weight (˜100g), and require a very small amount of power (sub-Watt). The data can be read-out through a USB serial connection or saved locally to an SD-card. We’ve been working with students
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at various universities and high-schools through-out the world and have found that a single detector can be built by a new student in under a few hours for approximately $100.
Higgs and EWSB / 208
Search for production of a Higgs boson and a top quark pair at CMS
Author: Evan Wolfe1
1 University of Virginia
Corresponding Author: [email protected]
The discovery of a Higgs particle made by the CMS and ATLAS experiments at the LargeHadron Collider in 2012 was heralded as a significant advancement in our understanding of the fundamental world. In the post-discovery era, the task turned to characterizing this Higgs boson: to determine whether it is the particle predicted within the context of the standard model (SM) of particle physics – or is something altogether different. Essentially all measurements have thus far indicated that this Higgs boson is consistent with the predictions of the SM. However, one of the crucial characteristics that remains to be measured is the coupling strength between the Higgs boson and the top quark. The best opportunity for this measurement comes through the observation of production ofaHiggs boson in association with a top quark pair (ttH production). In this talk, the status of the ttHcam- paign at CMS will be summarized covering results in all of the accessible decay channels.
Beyond Standard Model / 209
Search for Vector-like Top Quarks in di-Leptons
Author: Anthony Barker1
Co-authors: Gabriele Benelli 2; Julie Hogan 3; Rizki Syarif 3
1 Purdue University 2 University of Kansas 3 Brown University
Corresponding Author: [email protected]
We present a search for the pair-production of a vector-like top quark partner T of charge + 2/3, using proton-proton collision data at √s=13 TeV collected by the CMS Experiment in 2016 at the CERN LHC. Our search targets T quarks decays to final states with two light charged leptons, b-jets, and multiple light flavored jets. Both same-sign and opposite sign di-lepton channels are considered.
Neutrino II / 210
Recent progress on wire-cell tomographic reconstruction for LArTPC
Author: Hanyu Wei1
1 brookhaven national laboratory
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Corresponding Author: [email protected]
The Deep Underground Neutrino Experiment (DUNE) will use the state-of-the-art massive Liquid Argon Time Projection Chambers (LArTPCs) to search for CP violation in the neutrino sector, pro- ton decay, and supernova neutrinos. The 3D reconstruction of the particle trajectories in LArTPCs relies on multiple wire planes, which can be challenging due to the intrinsic ambiguity of identify- ing where along the wire the charge is deposited. In this talk, we present a novel 3D reconstruction method “Wire-Cell” inspired by the concept of tomography. Based on the independent measure- ments of the same charge from the three planes of wires, the 3D images of ionization charge can be efficiently reconstructed following the principle of compressed sensing utilizing mathematical techniques such as the L1 regularization. Current status and future prospects of the development will be reported.
Higgs and EWSB / 211
Search√ for Higgs boson pair production in the bbW W final state at s = 13 TeV with the ATLAS detector
Author: Benjamin Tannenwald1
1 Ohio State University
Corresponding Author: [email protected]
This talk presents a search for Higgs boson pair production where one Higgs boson decaysvia h → bb and the other Higgs boson via h → WW ∗ → ℓνqq (where ℓ is either an electron or a muon). The bbW W ∗ final state is the second largest di-Higgs branching fraction after hh → bbbb. This is the first search using the bbℓνqq final state to search for double Higgs√ production. Data from pp collisions recorded by the ATLAS detector at the LHC were collected at s = 13 TeV and correspond to an integrated luminosity of 36 fb−1. The search is performed looking for non-resonant and resonant di-Higgs production with resonant masses ranging from 500 to 3000 GeV.
Beyond Standard Model / 212
Inclusive search for vector-like T quark pairs in leptonic final states in proton-proton collisions at √s = 13 TeV
Authors: Anthony Barker1; Julie Hogan2; Rizki Syarif2
1 Purdue University 2 Brown University
Corresponding Author: [email protected]
A search is presented for pair production of heavy vector-like T quarks using proton- proton colli- sions were collected by the CMS experiment at the CERN LHC in 2016 with an integrated luminosity of 35.9 fb−1. A vector-like T quark of charge 2e/3 is predicted to decay to bW, tZ, and tH,sopair production of T quarks yields a wide array of final states. This inclusive search is performed in three channels: a single lepton channel that identifies boosted hadronic W and Higgs boson decays, same-sign dilepton channel and a trilepton channel that is enriched in Z boson decays. Production of vector-like B quarks that decay to tW, bZ, and bH are also considered. Results remain blinded at this time, but if no excess of data is observed this search will exclude T quark masses in the range of 1090 – 1210 GeV for many branching ratio combinations.
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Quark and Lepton Flavor / 213
New Physics in b -> s mu+ mu- after the Measurement of R_K*
Author: David London1
Co-authors: Alakabha Datta 2; Ashutosh Kumar Alok 3; Bhubanjyoti Bhattacharya 4; Dinesh Kumar 5; Jacky Kumar 6
1 Universite de Montreal 2 University of Mississippi 3 Indian Institute of Technology Jodhpur 4 Wayne State University 5 University of Rajasthan 6 Tata Institute of Fundamental Research
Corresponding Author: [email protected]
The recent measurement of R_K* is yet another hint of new physics (NP), and supports the idea that it is present in b -> s mu+ mu- decays. Others have performed model- independent analyses, finding that the NP must obey one of two scenarios: (I) C_9(NP) <0or(II) C_9(NP) = -C_10(NP) < 0. We confirm this, and show that more information about the NP canbe obtained by combining this result with a model-dependent analysis. The simplest NP models involve the tree-level exchange of a leptoquark (LQ) or a Z’ boson. We show that scenario (II) can arise in LQ or Z’ models, but scenario (I) is only possible with a Z’. Fits to Z’ models must take into account the additional constraints from Bs-Bsbar mixing and neutrino trident production.
Beyond Standard Model / 214
Generalized CP: Yukawa Interactions
Author: Alfredo Aranda1
1 Universidad de Colima (Mexico)
Corresponding Author: [email protected]
An introduction to the concept of generalized CP symmetry will be reviewed within the context of a three Higgs doublet model that exhibits interesting CP properties, such as the presence of so- called “half-CP-odd” scalars. Including fermions in the setup yields interesting phenomenological consequences. Progress in this direction will be presented.
Beyond Standard Model / 215
Search for vector-like B quarks with oppositely-charged dilepton pairs in proton-proton collisions at 13 TeV
Author: Tyler Mitchell1
1 Kansas State University
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Corresponding Author: [email protected]
We present the results of searches for pair-produced vector-like B quarks using proton-proton col- lision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 13 TeV. The searches are performed using opposite sign dileptons from a Z boson decay. Vector-like quarks, having symmetric interactions in the weak sector of the Standard Model (SM), are postulated as an alternate mechanism to solve the Hierarchy problem of the SM, compared to SUSY models. The search focuses on a vector-like quark doublet, meaning the vector-like B quark can decay to two po- tential channels: bZ or bH. Using a chi-squared minimization technique, we are able to reconstruct the potential vector-like B invariant mass. This mass is used to distinguish signal from background. This search allows us to probe for B quark masses up to 1.1 GeV assuming a 100% branching ratioof the B quark decay.
Neutrino Physics / 217
Status of an Alternative Measurement of the Inclusive Muon Neu- trino Charged-current Cross Section in the NOvA Near Detector
Author: Biswaranjan Behera1
1 IIT Hyderabad/Fermilab
Corresponding Author: [email protected]
NOvA is a long-baseline neutrino oscillation experiment. It uses the NuMI beam from Fermilab and two sampling calorimeter detectors off-axis from the beam. The 293 ton Near Detector measures the unoscillated neutrino energy spectrum, which can be used to predict the neutrino energy spectrum at the 14 kton Far Detector at Ash River, MN. The Near Detector also provides an excellent oppor- tunity to measure cross sections with high statistics, which benefit current and future long-baseline neutrino oscillation experiments. This analysis implements new algorithms to identify νµ charge- current events by using visual deep learning tools such as convolutional neural networks. In this talk we present the status of a measurement of the inclusive νµ CC cross section in the NOvA Near Detector.
Poster Session and Reception / 218
The formalization of the relation between wave and particle and the unifying of three kinds of wave-particle duality
Author: Yongchao Gan1
1 Faculty of Physics & Electronic Science, Hubei University
Corresponding Author: [email protected]
After Jihua Gan’s solution for contradiction of separation and continence between classical physics and quantum theory, the contradiction of particle and wave consequentially has new solution. Based on the advance of Dirac’s work in 1927, from “mode decomposition of classical electromagnetic field” to “photon decomposition of classical electromagnetic field”, a corresponding relation of basic units between classical electromagnetic field and quantum electromagnetic field is established, andanew wave-particle duality which is the third kind of wave-particle duality is revealed. It indicates that classical electromagnetic field has particle features in structure, which can be formed by superpo- sition of a series of electromagnetic element-waves. Further more, energy and momentum of each electromagnetic element-wave can be equal to the energy and momentum of a photon in the same frequency. Later, three kinds of wave-particle duality, Einstein’s Wave-particle duality of light in 1905, de Broglie’s Wave-particle duality of particle in 1923, and Gan’s Wave-particle duality of wave
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in 1994, are compared. A relation of π-type structure among them is presented, and the π-type triple wave-particle duality of micro-object is revealed. Finally, after mathematical abstraction and phys- ical generalization of π-type triple wave-particle duality, not only formulation of relation between wave and particle is accomplished but also the deep arcanum behind electromagnetic waves and photons is betrayed. It is just Tai Chi photon-wave and electromagnetic wave and photon are but two different showing forms of Tai Chi photon-wave under proper condition.
Higgs and EWSB / 219
Soft Gluon Resummation at NNLL Accuracy for Associated ttH¯ Production at the LHC
Authors: Anna Kulesza1; Leszek Motyka2; Tomasz Stebel2; Vincent Theeuwes3
1 University of Muenster 2 Jagiellonian University 3 SUNY, Buffalo
The ttH¯ production process probes the top-Higgs Yukawa coupling directly which is especially sen- sitive to the underlying physics. The measurement of the pp → ttH¯ cross section is among the highest priorities of the current LHC physics program and improvement of the theoretical accuracy is of the central importance. In this talk the latest results for soft gluon resummation at fixed invari- ant mass for pp → ttH¯ will be presented. The resummation is extended to next-to-next-to-leading logarithmic accuracy. The invariant mass resummation results will be presented in the formofthe inclusive cross section and the invariant mass distribution, including scale uncertainty.
Neutrino Physics / 221
Physics reach of electron neutrino appearance measurements in NOvA
Author: Erika Catano Mur1
1 Iowa State University
Corresponding Author: [email protected]
NOvA is a long-baseline neutrino oscillation experiment, which consists of two finely-segmented liquid-scintillator detectors operating 14 mrad off-axis from the NuMI muon neutrino beam. With an 810 km baseline, the study of muon to electron neutrino oscillations is sensitive to the still unknown charge-parity phase angle and the neutrino mass ordering. I will describe the electron neutrino appearance analysis and NOvA’s latest results, and discuss the experiment’s projected sensitivity to determine the mass hierarchy and discover CP violation in future analyses with increased exposure and the addition of antineutrino datasets.
Computing, Analysis Tools, and Data Handling / 222
Data analysis at CMS Level-1 Trigger
Author: Zhenbin Wu1
1 University of Illinois at Chicago
Page 76 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Corresponding Author: [email protected]
With the increasing luminosity and large number of simultaneous inelastic collisions per crossing (pile-up) at the LHC, it is challenging for online data selection. This talk will present the new ap- proaches developed in the Level-1 Trigger of the CMS experiment to cope with the increasing LHC luminosity and pileup.
Poster Session and Reception / 223
Background estimation for the electron neutrino appearance anal- ysis in NOvA
Author: Erika Catano Mur1
1 Iowa State University
Corresponding Author: [email protected]
The NOvA experiment is an off-axis, two-detector experiment designed to study electron neutrino (νe) appearance in the NuMI beam from Fermilab. The 300-ton Near Detector is 1 km from the target, and allows the study of the neutrino beam spectrum and composition before oscillations, while the larger (14,000 ton) Far Detector, situated on the surface 810 km away, observes the oscillated beam. The main backgrounds to νe appearance in the Far Detector arise from the intrinsic beam-νe contamination, and mis-classified neutral current and muon neutrino charged current interactions. This poster describes the techniques we use to predict such beam-induced backgrounds intheNOvA Far Detector based on the observed Near Detector data.
Neutrino Physics / 224
Searching for Neutrino-Induced Neutron Production at the Spal- lation Neutron Source (SNS) on Lead Target
Author: Brandon Becker1
1 University of Tennessee Knoxville
Corresponding Author: [email protected]
The COHERENT Collaboration is an experimental effort to measure coherent elastic neutrino-nucleus scattering (CEνNS). The Spallation Neutron Source provides an intense source of neutrinos from decay-at-rest pions, which makes the measurement of this standard model predicted process possi- ble. COHERENT seeks to make an unambiguous measurement by using a variety of low-threshold detectors capable of measuring the low energy nuclear recoils resulting from CEνNS interactions. Neutrinos are weakly interacting. Consequently we must seek to reduce and understand our back- grounds as well as possible to make this measurement, for which the collaboration has auxiliary detectors for the purpose of measuring these backgrounds. An irreducible background we face is the inelastic neutrino-induced production of neutrons within our detectors, which will share the time-structure of CEνNS signal. The cross-section for these neutrino-induced neutrons (NINs) can be quite significant for large nuclei such as Lead, an element commonly used in shielding. However, the value of this cross-section as calculated by theoretical models differs by as much as 30 %.We currently have a 980 kg deployment of lead in the SNS basement equipped with liquid scintillator cells for the detection of NINs 20 meters from the SNS target. We use a Geant4 model of the detector assembly to simulate expected signals of this interaction and the energetic (˜400 MeV) “fast” back- ground neutrons produced during the spallation of the SNS target which appear in our detectors in small numbers in time with the beam spill.
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Poster Session and Reception / 226
Design of a Nitrogen Cooled Target Shield Pile for the LBNF Beam- line
Author: Joseph Angelo1 Co-authors: Alberto Marchionni 2; Ang Lee 2; Dave Pushka 2; Jim Hylen 1; Karl Williams 2; Larry Hammond 2; Mathew Sawtell 2; Salman Tariq 2; Thomas Hamernik 2; andy stefanik 3
1 Fermi National Accelerator Laboratory 2 Fermilab 3 fermilab
Corresponding Author: [email protected]
The Long Baseline Neutrino Facility (LBNF) will utilize a beamline at Fermilab to produce aneutrino beam aimed at the Sanford Underground Research Facility in South Dakota. A primary proton beam will interact with a target to produce mesons, which will be focused by magnetic horns before decay- ing into neutrinos. The target and horns are contained in a chamber, which is surrounded byashield pile made of steel, concrete, marble, and borated high-density polyethylene to protect workers and surrounding groundwater from irradiation. The shielding is cooled by nitrogen gas which is pumped through the entirety of the chamber. The nitrogen also prevents corrosion and the production ofun- wanted radioactive isotopes. The chamber is kept at a positive pressure to prevent the infiltration of air into the chamber. The sealing system of the chamber is composed of a leak-tight stainless steel barrier around the target chamber, a modular hatch cover system to allow access to the chamber for maintenance, sealed feedthroughs which allow cooling water, power, and instrumentation to reach the target and horns inside, and a fill/purge system. The shielding closest to the beamline compo- nents is also cooled using water-cooled panels. We discuss here the current design of the shield pile, and the cooling and sealing systems which support it, as well as the expected challenges and plans for improvement.
Neutrino Physics / 227
COHERENT at the Spallation Neutron Source
Author: Kate Scholberg1
1 Duke University
Corresponding Author: [email protected]
The COHERENT collaboration’s primary objective is to measure coherent elastic neutrino-nucleus scattering (CEvNS) using the unique, high-quality source of tens-of-MeV neutrinos provided by the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL). COHERENT will deploy multiple detector technologies in a phased approach and will test the N 2 dependence of the cross section. This talk will describe COHERENT results, status and plans.
Beyond Standard Model / 228
Critical behavior of SU(3) lattice gauge theory with 12 light fla- vors
Authors: Floor Diego1; Yannick Meurice2; Zechariah Gelzer1
Page 78 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
1 University of Iowa 2 U. of Iowa
Corresponding Author: [email protected]
It is expected that when the number of light flavors of QCD-like theories is increased beyond some critical value, a transition having some Kosterlitz-Thouless features occurs. We report numerical results for a four-dimensional SU(3) lattice gauge theory with 12 flavors of unimproved staggered fermions. We show thatthe scaling of the imaginary part of the zeros of the partition function in the complex coupling plane is consistent with a first order phase transition for small values of the mass. We report searches for the endpoint of the line of first order phase transition in the mass-coupling plane. A light and weakly interacting scalar is expected near this endpoint. We present recent calculations of the second-order Renyi entanglement entropy for the two-dimensional O(2) model and show that it allows to delimit the Kosterlitz-Thouless phase in the chemical potential-coupling plane. We discuss the possibility of calculating this quantity for gauge theories with fermions.
Poster Session and Reception / 229
Looking at BNB Neutrinos in the NOvA Near Detector
Author: Ryan Murphy1
1 Indiana University
Corresponding Author: [email protected]
The NOvA Near Detector (ND) is a 300-ton, fine-grained, nearly fully active low-Z tracking calorime- ter located at Fermilab, located 1 km from the NuMI beam target. The unique positioning of the ND also results in an exposure to Booster Neutrino Beam (BNB) neutrinos at 162 mrad off-axis, 780 m away from the target with a kaon-induced neutrino energy peak around 1.4 GeV and a pion-induced energy peak around 400 MeV. With an estimated 2500 νμ true charged-current interactions from the BNB per year, there are enough data to perform a pion/kaon production ratio measurement, with an opportunity to augment the NOvA ND energy scale and add to the understanding of neutrino cross- sections in the 1-2 GeV region in the future. This analysis implements new algorithms to identify and reconstruct low energy events by using visual deep learning tools such as convolutional neural networks. This poster discusses the current status of the analysis.
Higgs and EWSB / 230
Search for the Higgs Boson Decays into Dimuons at CMS
Author: Sergei Gleyzer1
1 University of Florida
Corresponding Author: [email protected]
A search for the standard model Higgs boson decaying into a muon pair is presented. The analysis is conducted with pp collisions data collected at 13 TeV with CMS at the LHC. Observed and expected limits of are placed on the standard model Higgs cross section times branching ratio at the 95% confidence level.
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Computing, Analysis Tools, and Data Handling / 231
HEPCloud: Provisioning 160,000 Compute Cores for Science
Author: Burt Holzman1 Co-authors: Anthony Tiradani 2; Dave Dykstra 2; David Mason 1; Dirk Hufnagel 2; Eric Vaandering 2; Gabriele Garzoglio 2; Hyunwoo Kim 2; Kevin Retzke 1; Krista Majewski 2; Lothar Bauerdick 2; Neha Sharma 2; Nicolo Magini 2; Oliver Gutsche 3; Panagiotis Spentzouris 2; Parag Mhashilkar 3; Robert Kennedy 4; Steven Timm 2; Stuart Fuess 2
1 FNAL 2 Fermilab 3 Fermi National Accelerator Laboratory 4 FNAL-CD
Corresponding Author: [email protected]
The High Energy Physics (HEP) community is facing a daunting computing challenge intheup- coming years, as upgrades to the Large Hadron Collider and new technologies such as liquid argon detectors will require vast amounts of simulation and processing. Additionally, the stochastic na- ture of research suggests that leveraging elastically available resources would increase efficiency and cost-effectiveness. At the same time, the decreasing cost of renting commercial cloud resources and the increasing scale of High Performance Computing (HPC) facilities make them attractive targets for HEP workflows. The HEPCloud program aims to seamlessly integrate grid, cloud, and allocation- based facilities into a single virtual facility, as transparently to the user as possible. In the last year, we have integrated Amazon Web Services, Google Cloud Platform, and the Cori supercomputer at the National Energy Research Scientific Computing Center (NERSC). Results from these studies will be discussed.
Computing, Analysis Tools, and Data Handling / 232
Track extrapolation and muon identification in Belle II event re- construction
Author: Leo Piilonen1
1 Virginia Tech
Corresponding Author: [email protected]
I describe the charged-track extrapolation and muon-identification modules in the Belle II data- analysis code framework (basf2). These modules use GEANT4E to extrapolate reconstructed charged tracks outward from the Belle II Central Drift Chamber into the outer particle-identification detec- tors, the electromagnetic calorimeter, and the K-long and muon detector (KLM). These modules propagate the position, momentum, 6-dimensional covariance matrix, and time of flight through the detailed Belle II detector geometry to permit comparison of the extrapolated track with the hits detected in the outer detectors. In the KLM, a Kalman filter is employed to adjust the extrapola- tion based on the matching measurements. Downward-moving cosmic rays in the upper half of the detector are back-propagated upward. Several modifications were made to permit GEANT4E to in- teroperate with GEANT4 within a single basf2 event-generation/simulation/reconstruction job and to expand the number of particle species that are extrapolated.
Neutrino II / 233
Status of Sterile Neutrino fits with Global Data
Page 80 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Author: Alejandro Diaz1
1 Graduate Student at MIT
Corresponding Author: [email protected]
A number of short baseline neutrino oscillation experiments have observed an anomalous excess of neutrinos in the low energy range. This may hint towards the existence of additional neutrino mass splittings. Therefore, additional sterile (non-interacting) neutrino states above the current3 neutrino model would be required. On the other hand, many parameters of the allowed space are limited by experiments that have seen no anomaly. We will introduce models which accommodate these additional neutrinos, and then discuss our work towards fitting these models to the available global high delta-m2 oscillation data. We will then present the latest results of these fits.
Quark and Lepton Flavor / 234
Thomas-Fermi quark model for mesons
Authors: Suman Baral1; Walter Wilcox1
1 Baylor University
Corresponding Author: [email protected]
The first results of a new application of the Thomas-Fermi statistical quark model to mesonicstates will be presented. Interesting aspects of the theory will be discussed, distinguishing such states from baryonic matter. A major motivation of this study is the tetraquark states discovered atthe LHC and the possibility that stable multi-quark families of such states exist. Similar to the previous baryonic study, we use a two-inequivalent wavefunction approach to investigate aspects of many- meson matter. We think of our model as a tool for quickly assessing the characteristics ofnew, possibly bound, particle states of higher quark number content, which cannot yet be examined by lattice methods.
Beyond Standard Model / 235
Spectroscopy of lattice SU4 gauge theory with fermions in multi- ple representations
Author: Venkitesh Ayyar1 Co-authors: Benjamin Svetitsky 2; Daniel Hackett 1; Ethan Neil 1; Thomas Degrand 1; William Jay 1; Yigal Shamir 2
1 University of Colorado, Boulder 2 Tel Aviv University
Corresponding Author: [email protected]
We study the spectroscopy of an SU(4) gauge theory with dynamical fermions in both the fundamen- tal and the two-index antisymmetric representations. Such theories are of interest in the study of Physics Beyond the Standard Model, specifically in the context of partial compositeness. We discuss the spectrum of this theory and its implications.
Quark and Lepton Flavor / 236
Page 81 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Exclusion of multifold solutions of the CKM Unitarity Triangle by a time-dependent Dalitz plot analysis of B0->D(*) h0 with D- >K_S0 pi+ pi- decays combining BaBar and Belle data
Author: Frank Porter1
1 Caltech
Corresponding Authors: [email protected], [email protected]
We present results of a new analysis campaign, which combines the final data samples collected by the B factory experiments BaBar and Belle in single physics analyses to achieve a unique sensitivity in time-dependent CP violation measurements. The data samples contain (471 +- 3) x 10ˆ6 BB pairs recorded by the BaBar detector and (772 +- 11) x 10ˆ6 BB pairs recorded by the Belle detector in e+e- collisions at the center-of-mass energies corresponding to the mass of the Y(4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. We present a measurement of sin(2beta) and cos(2beta) by a time-dependent Dalitz plot analysis of B0->D(*) h0 with D->K_S0 pi+ pi- decays. A first evidence for cos(2beta)>0, the exclusion of trigonometric multifold solutions of the Unitarity Triangle and an observation of CP violation are reported.
Computing, Analysis Tools, and Data Handling / 237
The FabrIc for Frontier Experiments Project at Fermilab: Com- puting for Experiments
Author: Kenneth Herner1
1 Fermilab
Corresponding Author: [email protected]
The FabrIc for Frontier Experiments (FIFE) project isa major initiative within the Fermilab Scientific Computing Division designed to lead the computing model for non-LHC experiments at Fermilab. The FIFE project fosters close collaboration between experimenters and computing professionals to serve high-energy physics experiments of differing scope and physics area. The project also tracks and provides feedback on the development of common toolsforjob submission, identity management, software and data distribution, job monitoring, and databases for project tracking. Since the project’s inception, the computing needs of the experiments under the FIFE umbrella have significantly increased, and present a complex list of requirements to their service providers. To meet these requirements, recent advances in the FIFE toolset include a new identity management infrastructure, significantly upgraded job monitoring, and a workflow management system. We have also upgraded existing tools to access remote computing resources such as GPU clusters and sites outside the United States. We will present these recent advances, highlight the nature of collaboration between the diverse set of experimenters and service providers, and discuss the project’s future directions.
Neutrino II / 238
Event Reconstruction in the NOvA Experiment
Author: Biswaranjan Behera1
Co-authors: Fernanda Psihas 2; Gavin Davies 2
Page 82 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
1 IIT Hyderabad/Fermilab 2 Indiana University
Corresponding Author: [email protected]
The NOvA experiment observes oscillations in two channels ( electron-neutrino appearance and muon-neutrino disappearance) using a predominantly muon-neutrino NuMI beam. The Near De- tector records multiple overlapping neutrino interactions in each event and the Far Detector has a large background of cosmic rays due to being located on the surface. The oscillation analyses rely on the accurate reconstruction of neutrino interactions in order to precisely measure the neutrino energy and identify the neutrino flavor and interaction mode. Similarly, measurements of neutrino cross sections using the Near Detector require accurate identification of the particle content of each interaction. A series of pattern recognition techniques have been developed to split event records into individual spatially and temporally separated interactions, to estimate the interaction vertex, and to isolate and classify individual particles within the event. This combination of methods to achieve full event reconstruction in the NOvA detectors will be discussed.
Beyond Standard Model / 239
What does a non-vanishing neutrino mass have to say about the strong CP problem?
Author: P.Q. Hung1
1 University of Virginia
Corresponding Author: [email protected]
A new solution to the strong CP problem with distinct experimental signatures at the LHC is pro- posed. It is based on the Yukawa interactions between mirror quarks, Standard Model (SM) quarks and Higgs singlets. (Mirror quarks and leptons which include non-sterile right-handed neutrinos whose Majorana masses are proportional to the electroweak scale, form the basis of the EW-νR model.) The aforementioned Yukawa couplings can in general be complex and can contribute to ¯ Arg DetM (θ = θQCD + Arg DetM) at tree-level. The crux of matter in this manuscript isthe fact that {\em no matter how large} the CP-violating phases in the Yukawa couplings might be, Arg DetM can remain small i.e. θ¯ < 10−10 for reasonable values of the Yukawa couplings and, in fact, vanishes when the VEV of the Higgs singlet (responsible for the Dirac part of the neutrino mass in the seesaw mechanism) vanishes. The smallness of the contribution to θ¯ is {\em principally due} to the smallness of the ratio of the two mass scales in the seesaw mechanism: the Dirac and Majorana mass scales.
Poster Session and Reception / 240
Tracking Detector Performance and Data Quality in the NOvA Experiment
Author: Biswaranjan Behera1
1 IIT Hyderabad/Fermilab
Corresponding Author: [email protected]
NOvA is a long-baseline neutrino oscillation experiment. It uses the NuMI beam from Fermilab and two sampling calorimeter detectors located off-axis from the beam. The NOvA experiment measures the rate of electron-neutrino appearance in the almost pure muon-neutrino NuMI beam, with the data measured at the Near Detector being used to accurately determine the expected rate at the Far
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Detector. It is very important to have automated and accurate monitoring of the data recorded by the detectors so any hardware, DAQ or beam issues arising in the 344k (20k) channels of the Far (Near) detector which could effect quality of the data taking are determined. This poster willcover the techniques and detector monitoring systems in various stages of data taking.
QCD / 241
Alternative Formulation of the z-Expansion in Semileptonic De- cays
Authors: Erik Gustafson1; Yannick Meurice2; Zechariah Gelzer1
1 University of Iowa 2 U. of Iowa
Corresponding Author: [email protected]
We propose an alternative method to perform the z expansion in the B→π l ν decay by using a rational expression that automatically satisfies the constraint imposed by the conservation of angular momentum. This avoids having to impose a constraint on the truncated series. The accuracyof the formulation was checked by fitting the lattice data in conjunction with the experimental data from Belle and BaBar. We discuss the accuracy of extrapolations based on fits of subregions of the kinematic range.
Poster Session and Reception / 242
Prospects for Neutron-Antineutron Oscillation Searches with Con- volutional Neural Networks in Liquid Argon Time Projection Cham- bers
Authors: Georgia Karagiorgi1; Jeremy Hewes2; Kazuhiro Terao3
1 Columbia University 2 The University of Manchester 3 Nevis Laboratories, Columbia University
Corresponding Author: [email protected]
Future, large-scale liquid argon time projection chamber (LArTPC) detectors provide a unique op- portunity to search for neutron-antineutron oscillation. This is a rare, baryon-number-violating signature predicted only by theories beyond the Standard Model. This talk will present a convolu- tional neural network approach that can be used to search for neutron-antineutron oscillation events in the future Deep Underground Neutrino Experiment (DUNE). The network performance will be presented, along with preliminary sensitivity results.
Particle Detectors / 243
ATLAS LAr Calorimeter Electronics Upgrade for the HL-LHC
Author: Tim Andeen1
1 U Texas, Austin
Page 84 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Corresponding Author: [email protected]
After the the LHC high-luminosity upgrade in 2024-2026 the detectors will need to operate atlu- minosities about 5-7 times larger than assumed in their original design. The current readout of the ATLAS Liquid Argon (LAr) Calorimeters was not designed for this environment and the expected total radiation doses are beyond the anticipated lifetime of the current front-end electronics. As a result, a replacement of the front and back-end electronics for all 182k channels is planned. The new low-power electronics will capture the ˜400 ns detector pulses with a dynamic range of 16-bits. Among the technologies under evaluation for this upgrade are a pre-amplifier, shaper and an ADC all developed in 65 nm CMOS technology. The design of a radiation-hard, 14-bit ADC operating at 40 MHz will be presented. Results from performance and simulation of the calorimeter readout system and results from design studies and first tests of the components will be shown. T
Neutrino II / 244
Fertile neutrinos
Author: Alfredo Aranda1
1 Universidad de Colima (Mexico)
Corresponding Author: [email protected]
Electroweak scale right-handed neutrinos have become a commodity in recent years. Most scenarios involve the so-called sterile neutrino paradigm, where right-handed neutrinos are assumed to be completely neutral under the Standard Model gauge group. A more interesting possibility is - of course - one in which they do interact. Such a fertile (non-sterile) possibility is certainly important phenomenologically and in this talk I will briefly review what has been explored so far for fertile right-handed neutrinos. I will show that they are not only phenomenologically viable but that their general setup provides very appealing theoretical and model building possibilities that I believe have been overlooked.
Precision Electroweak Physics / 246
Addressing the Proton Radius Puzzle Using QED-NRQED Effec- tive Field Theory
Author: Steven Dye1
Co-authors: Gil Paz 1; Matthew Gonderinger 1
1 Wayne State University
Corresponding Author: [email protected]
The proton radius puzzle, i.e. the large discrepancy in the extraction of the proton charge radius between regular and muonic hydrogen, challenges our understanding of the structure of the pro- ton. It can also be an indication of a new force that couples to muons, but not to electrons. An effective field theory analysis using Non Relativistic Quantum Electrodynamics (NRQED) indicates that the muonic hydrogen result can be interpreted as a large, compared to some model estimates, muon-proton spin-independent contact interaction. The muonic hydrogen result can be tested bya muon-proton scattering experiment, MUSE, that is planned at the Paul Scherrer Institute in Switzer- land. The typical momenta of the muons in this experiment are of the order of the muonmass.In
Page 85 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
this energy regime the muons are relativistic but the protons are still non-relativistic. The inter- action between the muons and protons can be described by a hybrid QED-NRQED effective field theory.
Poster Session and Reception / 247
Particle Identification and Kaon Physics in LArIAT
Author: Daniel Smith1
1 Boston University
Kaon physics in liquid argon time projection chambers (LArTPCs) is important for future proton decay searches in large-scale LArTPCs, such as DUNE. Using LArIAT, a LArTPC test beam experi- ment at Fermilab, we have selected—with traditional beam line instrumentation—around 3E3 kaon candidate events, creating the first kaon data sample in a LArTPC. This sample allows us toperform the first studies of kaons in this detector, including the kaon total cross section on argon, automatic reconstruction performance of kaon topologies, and LArTPC-based kaon identification efficiencies. Further, we explore ways to improve this LArTPC-based particle identification through the use of data-driven machine learning techniques, work beneficial to all future automatic LArTPC recon- struction.
Dark Matter / 248
Searches for dark matter with the Super-Kamiokande detector
Author: Katarzyna Frankiewicz1
1 National Centre for Nuclear Research
Corresponding Author: [email protected]
Indirect searches for dark matter using data collected with the Super-Kamiokande detector inyears 1996-2016 were performed. The excess of neutrinos from possible dark matter sources such asSun, Earth and Galactic Center, compared to the expected atmospheric neutrino background was searched. Event samples including both electron and muon neutrinos covering a wide range of energies were used, with sensitivity to dark matter masses down to tens of GeV. Allowed number of dark matter induced neutrinos which can be contained in SK data so far was estimated. Obtained limits on DM induced neutrino flux were related to limit on spin-dependent (for the Sun) and spin-independent (for the Sun and the Earth’s core) WIMP-nucleon cross section. In case of Galactic Center analysis, the upper limit on the self-annihilation cross-section was derived.
Particle Detectors / 249
Characterizing New Detectors for SuperCDMS SNOLAB
Author: Matthew Fritts1
1 University of Minnesota
Corresponding Author: [email protected]
Page 86 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
The Super Cryogenic Dark Matter Search (SuperCDMS) uses sub-Kelvin semiconductor detectors to search for dark matter WIMPs (Weakly Interacting Massive Particles), with excellent sensitivity to low mass WIMPs. The collaboration is currently building the next phase, SuperCDMS SNOLAB, with larger and more sensitive detectors. Two different detector designs have been developed: the iZIP design, which can discriminate between electron- and nuclear-recoil events, and the CDMS-HV design, which has extremely low energy thresholds allowing sensitivity to WIMPs with masses well below 1 GeV. Detectors of these designs are being fabricated with two different target materials, germanium and silicon, and all four detector types will be deployed at SNOLAB providing comple- mentary sensitivities. I will report on early tests of prototypes of these new detectors and their performance parameters.
Poster Session and Reception / 250
Measuring the tt¯Forward-Backward Asymmetry using semi-leptonic final states at 8 TeV with the CMS detector
Author: lei feng1 Co-authors: Morris Swartz 1; Nick Eminizer 1
1 Johns Hopkins University
Corresponding Author: [email protected]
We presents a measurement of Forward-Backward Asymmetry(AFB) in tt¯ production. The data − √ sample corresponds to 19.7 fb 1 of integrated luminosity in proton-proton collisions at s = 8 TeV collected by the CMS experiment at the LHC. Events selected contain a single isolated muon or electron, with four or five jets of which two are b-tagged. A template technique is used to extract the asymmetry from the top quark kinematic distributions. This technique is based upon an extension of the tree-level cross section for qq¯initial states that sensitively isolates qq¯from gg/qg initial states. The measured AFB and relative aboundance of qq¯initiated tt¯will be reported and compared to both theoretical calculation and results from D0 and CDF experiments of Tevatron.
Neutrino Physics / 253
Summary of the Second Numu Disappearance Results from the NOvA Experiment
Author: Michael Baird1
1 University of Virginia
Corresponding Author: [email protected]
In light of the Nobel Prize awarded for neutrino oscillations in 2015, it is an exciting time to be a part of a long-baseline neutrino oscillation experiment. NOvA is one such experiment based out of Fermilab National Accelerator Laboratory, which uses two liquid scintillator detectors, one at Fermilab (the near” detector) and a second 14 kton detector in northern Minnesota (thefar” detector.) 2 The numu disappearance analysis is sensitive to the mixing parameters θ23 and ∆m32 and is capable of shedding light on the open question of whether or not θ23 is maximal. This talk will present the 20 results from the second νµ disappearance analysis using a full detector equivalent of 6.05 × 10 POT, which rejects the maximal mixing solution at 2.6σ.
Diversity, Education, and Outreach / 254
Page 87 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
UIUC diversity and inclusion efforts in STEM education
Author: Kevin Pitts1
1 University of Illinois
Corresponding Author: [email protected]
It is well known that the number of jobs in science and engineering is expected to grow in the next few years. However, the nation’s current student body is not prepared nor sufficiently interested to pursue careers in the science, technology, engineering and mathematics (STEM) fields. More alarming is the fact that the demographics of students that are attracted to STEM fields demonstrate a significant gender and race/ethnicity gap, with women, Hispanics, and African-Americans being vastly underrepresented in the STEM fields. These gaps in STEM participation rates has led theUni- versity of Illinois at Urbana-Champaign (UIUC) to develop multiple outreach programs that can help increase the participation of minority students in college-level STEM disciplines. A partnership between both the Colleges of Engineering and Education at UIUC, and the Chicago Pre-College Science & Engineering Program (ChiS&E), a non-profit organization that aims to prepare inner-city students for college STEM-related disciplines, developed the Illinois-ChiS&E Alliance for Nurturing Excellence in STEM Education and Leadership (ICANEXSEL) Program, an out-of-school Saturday program for Chicago Public School (CPS) middle school students. The ICANEXSEL Pro- gram seeks to improve opportunities in STEM for students from traditionally underrepresented groups by: 1) collaborating with experts to develop engaging, hands-on, math-based curricula, 2) recruiting and training CPS teachers on best practices in project-based and collaborative learning in order to facilitate the Saturday sessions, 3) recruiting and training current UIUC students to serve as mentors to the participating students via the development of a new service-learning course, the Engineering for Social Justice Scholars Program, and 4) working with the parents of participating students to help them understand the curricular needs of their children along with the steps and actions necessary to help them become college ready. While the ICANEXSEL was launched as a 6th- 8th grade program, it seeks to add an additional grade level every year to develop a comprehensive K-12 pathway program. To further promote the participation of women in the STEM fields, the College of Engineering at UIUC will build from its existing programming in order to include more opportunities for women to engage with STEM. As a successful summer program for high school women since 1998, the Girls’ Adventures in Math, Engineering, and Science (GAMES) Summer Camp will launch its first no-cost, middle school program in the summer of 2017. Through a partnership with the Materials Science & Engineering Department, the College of Engineering will offer a one-week day camp for middle school girls in which students will investigate how to develop new materials, understand their func- tion, and predict ways in which they will evolve in the future. This addition to the existing GAMES Camp program will promote participation of women in STEM by engaging them at an early age, which has been shown to be crucial in the recruitment of women to the STEM fields.
Beyond Standard Model / 255
Thermodynamics of SU(4) gauge theory with fermions in multi- ple representations
Author: Daniel Hackett1 Co-authors: Benjamin Svetitsky 2; Ethan Neil 1; Thomas DeGrand 1; Venkitesh Ayyar 1; William Jay 1; Yigal Shamir 2
1 University of Colorado, Boulder 2 Tel Aviv University
Corresponding Author: [email protected]
We study the phase structure of SU(4) gauge theory with dynamical quarks in both the fundamen- tal and two-index antisymmetric representations. Such “multi-representation” theories have been speculated to exhibit separated phase transitions, but our lattice calculations suggest the existence of only a single thermal phase transition: both species of fermion appear to confine and break chiral
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symmetry simultaneously. We investigate the order of the combined phase transition in various limits of the theory, and compare to theoretical expectations based on chiral symmetry.
Particle Detectors / 256
Construction of the Phase 1 upgrade of the CMS pixel detector
Author: Maral Alyari1
1 Fermilab
Corresponding Author: [email protected]
The innermost layers of the CMS tracker are built out of pixel detectors arranged inthreebarrel layers (BPIX) and two forward disks in each endcap (FPIX). The original CMS detector was designed for the nominal instantaneous LHC luminosity of 1 x 10ˆ34 cmˆ-2 sˆ-1. Under the conditions expected in the coming years, which will see an increase of a factor two of the instantaneous luminosity, the CMS pixel detector will see a dynamic inefficiency caused by data losses due to buffer overflows. For this reason the CMS Collaboration has installed during the recent extended end of year shutdown a replacement pixel detector. The Phase I upgrade of the CMS pixel detector will operate at full efficiency at an instantaneous luminosity of 2 x 10ˆ34 cmˆ-2 sˆ-1 with increased detector acceptance and additional redundancy for the tracking, while at the same time reducing the material budget. These goals are achieved using a new readout chip and modified powering and readout schemes, one additional tracking layer both in the barrel and in the disks, and new detector supports including a CO2 based evaporative cooling system, that contribute to the reduction of the material in the tracking volume. This contribution will review the design and technological choices of the Phase I detector, witha focus on the challenges and difficulties encountered, as well as the lessons learned for future up- grades.
Computing, Analysis Tools, and Data Handling / 257
GPUs in LHCb for Analysis
Authors: Henry Schreiner1; Marco Gersabeck2; Michael Sokoloff3
1 LHCb 2 The University of Manchester 3 University of Cincinnati
Corresponding Author: [email protected]
Datasets with millions of events in charm decays at LHCb have prompted the development of pow- erful fitting and analysis tools capable of handling unbinned datasets using GPUs and multithreaded architectures. GooFit, the original GPU fitting program with a familiar syntax resembling classic RooFit, has under- gone significant redesign and has expanded physics and computing capabilities. The performance has been improved and tested on a variety of systems. GooFit 2.0 is easier than ever to install, de- velop, and use on any system. A new templated header-only library, Hydra, provides highly optimized general framework for fits, Monte Carlo generation, integration, and more. The design and benefits of this system along with initial tests will be shown.
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Finally, a model-independent search for direct CP violation using an unbinned approach called an energy test was performed directly using the Thrust library (which both of the previous packages are based on). Public results from this analysis and performance comparisons will be presented.
Diversity, Education, and Outreach / 258
Survey of the physics landscape and attempts to improve diver- sity.
Author: Brian Beckford1
1 University of Michigan
Corresponding Author: [email protected]
Students from statistically underrepresented minority (URM) groups and women earn a smaller frac- tion of undergraduate and graduate degrees in most physical sciences, particularly in physics. This underrepresentation is also prevalent at the faculty level and in higher administration roles at most physics departments, universities, and national laboratories. This talk will present statistics on participation in physical sciences, and discuss the outcomesof initiatives such as Bridge Programs which aim to improve diversity in physics graduate programs.
Quark and Lepton Flavor / 260
Present status of the search for the K—>π0νν decay with the KOTO detector at J-PARC
Author: Brian Beckford1
1 University of Michigan
Corresponding Author: [email protected]
We have performed a search for the K—>π0νν decay with the KOTO detector at J-PARC. The KOTO detector was designed to observe the decay and measure its branching ratio (BR). Focusing on this rare “golden” decay in quark flavor physics provides an ideal candidate to probe for physics beyond the standard model (BSM). The established experimental upper limit of the branching ratio wasset by the KEK E391a collaboration at 2.6 x 10−8. This is still well above the SM value of the branching ratio, which is predicted to be 3.0 x 10−11 with minor uncertainties. The signal of importance is the pair of photons from the π0 decay and no coincident signals from veto counters. This along with a large discernible transverse momentum provides us with unique signature. KOTO utilizes a Cesium Iodide (CsI) electromagnetic calorimeter as the main photon detector in combination with hermetic veto counters to ensure that there are no other detected particles. This talk will cover a description of the improvements to the detector, current status of analysison data collected in 2015-2016, and future prospects.
Quark and Lepton Flavor / 261
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Kaon-Scatter Introduced Backgrounds in the KOTO Experiment
Author: Stephanie Su1
1 University of Michigan
Corresponding Author: [email protected]
The KOTO experiment is a particle physics experiment located in J-PARC, Japan, aiming toex- plore physics beyond the Standard Model by measuring the branching ratio of the KL →πˆ0 νν ̅ decay. This decay has not yet been observed. The branching ratio predicted by the Standard Model of (3.0±0.3)×10-11 and the current experimental upper limit established by KEK E391a is 2.6×10- 8. The signal of KL →πˆ0 νν ̅ decay has the signature of two photons on the calorimeter with nosignal on the veto detectors. It also has a large transverse momentum due to missing neutrinos. Kaons that decay outside the beam line with final product of two photons, such as KL →γγ and KL →πˆ+πˆ- πˆ0, can appear to have large transverse momentum due to kaon scattering and beam interaction with the detectors. These off-axis kaon decay events can impact the upper limit of KL→πˆ0νν̅ branching ratio. Aluminum targets located at the upstream of the KOTO detector and inside the decay-volume were used to study kaon beam profile, which provided off-axis kaon decay vertex information. The beam profile provided insights on background contributions to the signal. Studies on the kaon beam profile and background identification from kaon scattering will be presented in this talk.
Neutrino Physics / 262
Using the PPFX package for the DUNE Experiment
Author: Amit Bashyal1
1 Oregon State University
Corresponding Author: [email protected]
PPFX for the Deep Underground Neutrino Experiment (DUNE) is a project that aims to improve the prediction of DUNE’s flux and the estimation of hadron production uncertainties using hadron production data. Currently, the DUNE flux relies on GEANT4 based physics model which large uncertainties from hadronic interactions in the beamline. We used PPFX, a package developed by the MINERvA experiment at Fermilab to add improved hadronic interaction data to the GEANT4 based flux prediction. We use PPFX to study the predicted flux uncertainties for several candidate beamline designs. In this talk, I will discuss the process of applying the PPFX package to DUNE’s flux and the resulting flux uncertainties.
Beyond Standard Model / 263
Search for compressed supersymmetry using low pT leptons and missing transverse energy with the ATLAS detector
Author: Joseph Reichert1
1 University of Pennsylvania
Corresponding Author: [email protected]
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A search is presented for the electroweak production of gauginos, the supersymmetric partners of the Standard Model gauge bosons, in a scenario where the mass difference between the lightest supersymmetric particle (LSP) and other light gauginos is small, resulting in decays to virtual W/Z bosons and the LSP. The search is based on 36 fbˆ-1 of sqrt(s) = 13 TeV data collected by the ATLAS detector at the LHC in 2015 and 2016. The signature is two or three low transverse momentum (pT) charged leptons (e, mu) and large missing transverse energy, which is enhanced by requiring a high pT initial state radiation jet. The use of very low pT leptons poses challenges for triggering, particle identification, and background estimation.
264 New Physics Implication of Higgs Precision Measurements
Author: Wei Su1 Co-authors: Honglei Li 2; Jiayin Gu 3; Shufang Su 4; Zhen Liu 5
1 University of Arizona & ITP, CAS 2 JiNan University 3 Desy 4 University of Arizona 5 Fermilab
Corresponding Author: [email protected]
In this talk, we discuss the new physics implication of Higgs Precision Measurements at the future electron-positron Higgs factories, including the Chinese proposal CEPC, the European proposal FCC- ee, as well as the Japanese proposal of ILC. We explored two typical types of new physics models: Two Higgs Double Model (2HDM) as an example of weakly coupled BSM scenarios, and composite Higgs Model as an example of strongly coupled BSM scenarios. For 2HDM, we studied both the tree level effects, mainly, the effect caused by the mixture of SM-like Higgs and Non-SM like Higgsinthe 125 GeV light Higgs, as well as the loop effects, introduced by the extra Higgses running in the loop. − We found that even comparing to HL-LHC with 3000 fb 1 luminosity, future Higgs factories could narrow the region of cos(β −α) at least a factor of 2 smaller when considering tree level effects only. Considering the loop effects in the alignment limit, the heavy Higgs masses could be constrained to be larger than 500 GeV or better. For composite Higgs Model, we performed a 10-parameter fitto the coefficients of the effective operators. The scale Lambda for the non-renormalizable operators could be constrained to be around 5 TeV or higher.
QCD / 265
Jet Calibration in the ATLAS Experiment
Author: Jeff Dandoy1
1 University of Pennsylvania
Corresponding Author: [email protected]
The proper reconstruction and calibration of jets in ATLAS is crucial for many analyses performing precise measurements or searches for new physics. This talk reviews the derivation of the jet energy
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scale using 36.1 fb−1 of data collected at a center-of-mass energy of 13 TeV over 2015 and2016,as well as recent developments in jet reconstruction and calibration.
Cosmology and Astrophysics / 266
The Simons Observatory: Cosmology and Fundamental Physics from the Cosmic Microwave Background
Author: Adrian Lee1
1 University of California, Berkeley
Corresponding Author: [email protected]
The Simons Observatory (SO) is a next generation observatory optimized to make precise measure- ments of the comic microwave background (CMB) over frequencies spanning 30-300 GHz. The obser- vatory will be built with a combination of 6 meter class and 1 meter class telescopes and up to 40,000 detector focal-plane arrays to make high fidelity maps over degree to arc-minute angular scales. These data will be used to detect or place stringent limits on primordial gravitational waves,new light relativistic species, neutrino properties, and to make many other astrophysical and cosmologi- cal measurements. The SO instrument will be a stepping stone to CMB-S4 which will field hundreds of thousands of CMB detectors across multiple telescope platforms. We will present the status of the design development for the large- and small-aperture SO telescopes, the cryogenic receivers, cold optical elements, and our plan for fielding and reading out tens of thousands of multichroic, superconducting detectors.
Computing, Analysis Tools, and Data Handling / 267
Mu2e Trigger & DAQ Design and Challenges
Author: Tomonari Miyashita1
1 California Institute of Technology
Corresponding Author: [email protected]
The Mu2e experiment at Fermilab aims to measure the charged-lepton flavor violating neutrinoless conversion of a negative muon into an electron, producing a monochromatic electron with an energy slightly below the rest mass of the muon (104.97 MeV). We expect to set a limit on the ratio between the muon conversion and capture rate of 6.7 × 10ˆ−17 at 90% CL in three years of running using a pulsed μ- beam that should provide ˜10ˆ18 stopped muons on an aluminum target. A critical component of the experiment is the Trigger and Data Acquisition (TDAQ) subsystem. The TDAQ is responsible for collecting data from the detector subsystems, as well as generating and distributing timing information to synchronize the subsystems. The TDAQ also controls the op- erating modes for each event window, and provides monitoring and operator interfaces. Before delivering data to be processed offline, the TDAQ system must also provide online processing and filtering to achieve a rejection factor of 100 or more, resulting in approximately 7 Petabytes ofdata per year. We present an overview of the TDAQ design and the progress of our development work as we seek to facilitate the accomplishment our physics goals.
Poster Session and Reception / 268
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Search for a large muon neutrino magnetic moment in the NOvA Near Detector
Author: Biao Wang1
Co-author: Thomas Coan 1
1 Southern Methodist University
Corresponding Author: [email protected]
Various scenarios of beyond the Standard Model physics predict Majorana neutrinos with large mag- netic moments. NOvA is well suited for such searches since its detectors are optimized for efficient electron detection and its Near Detector (ND) is exposed to an intense neutrino flux from the NuMI neutrino beam at Fermilab. This facilitates the accumulation of significant statistics for studying muon-neutrino-electron elastic scattering in the ND. A deep learning neural network for particle identification training is used to distinguish scattered electrons from neutral pion induced electro- magnetic showers and the charged current background. We present an overview of this technique and the sensitivity on the search for a muon neutrino magnetic moment.
Poster Session and Reception / 269
Probing new physics scale through dimension-6 operator and en- hanced tth¯ and hh production at the LHC
Author: SUDIP JANA1
Co-author: Satyanarayan Nandi 2
1 OKLAHOMA STATE UNIVERSITY 2 Oklahoma State University
Corresponding Author: [email protected]
No matter what the scale new physics is, deviations from the Standard Model for the Higgsobserv- ables will indicate the existence of such a scale. We consider effective six dimensional operators, and their effects on the Higgs productions and decays to estimate this new scale. Large uncertain- ties with the SM predictions still remains in some of the observables of these measurements. This encourages us to venture if there is a new physics scale that might be estimated from the uncertainty in these measurements, as well as if we can make make predictions which can be tested in the LHC. With this aim in mind, we consider the effect of a selected set of dimension six operators alongwith the SM. The dimension six operators related to Higgs physics can be introduced both in thestrong sector, as well as in the electroweak sector. Such operators will make extra contributions for the Higgs productions, as well as for its various decay modes. In the most general case, for the effec- tive dimension six operators, there are many operators, and involve large number of parameters. In order to reduce the number of parameters, we only consider a selected set of such operators in the gauge sector (both strong and electroweak (EW), as well as the Yukawa sector, which are responsible for larger effects, and do not affect the constraints from the EW precision tests in a significant way. Given the large uncertainties in the Higgs Productions and decays, we find that this scale can beas low as 500 GeV. We then calculate the tth¯ ̄productions , as well as double Higgs using the effective couplings at the Large Hadron Collider, and show these can be much different than those predicted by the Standard Model, for an wide region of these parameters space. These predictions can be tested in the current or the future runs of the LHC.
270 Neutrino physics with dark matter detectors
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Author: Louis Strigari1
1 Texas A&M University
Corresponding Author: [email protected]
I will discuss the prospects for separating dark matter and neutrino interactions in direct dark matter searches, and for using these searches to study the properties of neutrinos and their astrophysical sources.
Precision Electroweak Physics / 271
Electroweak precision measurements with the CMS detector
Author: Rafael Lopes de Sa1
1 Fermilab
Corresponding Author: [email protected]
Measurements of electroweak parameters with the CMS detector are reported. The effective elec- troweak mixing angle sinˆ{2}_{\theta} is extracted by measuring the forward-backward asymmetry in dilepton events near the Z boson mass region. Experimental and theoretical challenges needed for a high-precision W boson mass measurement are reported using a sample of Z->mumu events.
Beyond Standard Model / 272
Search for electroweak production of supersymmetric√ particles in the two and three lepton final state at s = 13 TeV with the ATLAS detector
Author: Elodie Resseguie1
1 University of Pennsylvania
Corresponding Author: [email protected]
Supersymmetry gives a solution to naturalness as well as a candidate for dark matter by predicting a new bosonic (fermionic) partner for each Standard Model fermion (boson). Searches for electroweak production of supersymmetric particles decaying via sleptons and gauge bosons, W and Z, to final states with two or three leptons and missing transverse√ momentum were performed with the ATLAS detector. The search uses proton-proton collisions at s = 13 TeV recorded with the ATLAS detector at the LHC during 2015 and 2016 corresponding to 36fb−1. No significant excesses over the Standard Model were observed so exclusion limits are set on masses of the gauginos, the supersymmetric partners of W ±, Z0, and h, in simplified models.
Neutrino II / 275
Neutrino energy reconstruction in the DUNE far detector
Author: Nick Grant1 Co-author: Tingjun Yang 2
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1 University of Warwick 2 FNAL
Corresponding Author: [email protected]
A study is made of neutrino energy reconstruction in the DUNE far detector. This detector will consist of four modules of liquid argon time projection chambers (LArTPCs), each with a fiducial mass of 10kt; the study uses simulations of one of these modules. We have developed a method to reconstruct the neutrino energy taking advantage of the excellent spatial and energy resolutions of LArTPCs. For events selected as numu CC interactions, the reconstructed energy is estimated as the sum of the momentum of the longest reconstructed track and the reconstructed hadronic energy. If the longest track is contained in the detector, its momentum is estimated from its range, while its momentum is estimated using multi-Coulomb scattering if it exits the detector. The hadronic energy is estimated using the charges of the reconstructed hits not in the track. For events selected as nue CC interactions, the reconstructed energy is estimated as the sum of the energy of the reconstructed shower with the highest total hit charge and the reconstructed hadronic energy. The hadronic energy is estimated from the charges of the reconstructed hits not in the shower. This method can be applied to other neutrino experiments that use the LArTPC technology.
Neutrino Physics / 276
A study of charged kaon-nucleon total interaction cross section in liquid argon.
Author: Elena Gramellini1
1 Yale University
Corresponding Author: [email protected]
We present a study of the charged kaon-nucleus total interaction cross section in liquid argon per- formed at the LArIAT experiment. The kaon-nucleus total interaction cross section has never been measured before in argon and it is fundamental to shed light on light meson interactions in nuclei. Additionally, this measurement provides a key input to proton decay studies in future Liquid Argon Time Projection Chamber (LArTPC) experiments such as DUNE. LArIAT is a small LArTPC deployed in a calibration test beam line at Fermilab. The LArIAT beam line detectors allow identification of kaons in the beam and measure their momentum before enter- ing the TPC. The precise calorimetric energy reconstruction and excellent tracking resolution ofthe LArTPC technology enables the measurement of the total differential cross section for the tagged kaons.
Neutrino Physics / 277
Antiproton Annihilation on Argon Nuclei in LArIAT
Author: William Foreman1
1 University of Chicago
Final state topologies of antiproton-nuclei annihilation at rest are similar to theorized bound neutron- antineutron oscillation signatures, which the DUNE liquid argon time projection chamber (LArTPC) will search for among other rare phenomena like proton decay. LArIAT, a LArTPC in a test beam at Fermilab, has observed antiproton annihilation on argon for the first time. This sample provides a unique opportunity to explore the ability of LArTPCs to identify and reconstruct this class of event. Further, studying the multiplicity and energy of particles emerging from annihilation at rest on
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argon could help validate intranuclear cascade and fragmentation models implemented in simulation toolkits like Geant4.
Particle Detectors / 278
The Construction and Commissioning of the Belle II iTOP Counter
Author: Boqun Wang1
1 University of Cincinnati
Corresponding Author: [email protected]
The barrel-region particle identification detector is crucial for extending the physics reachofthe Belle II experiment operating at the SuperKEKB accelerator. For this purpose, an imaging-Time-of- Propagation (iTOP) counter was developed, which is a new type of ring-imaging Cherenkov detector. The iTOP consists of 16 separate modules arranged azimuthally around the beam line. Eachmodule consists of optical components fabricated from quartz (one mirror, one prism, and two bars), an array of micro-channel-plate photo-multiplier tubes (MCP-PMTs), and front-end electronics. The waveforms read out are processed by firmware, and the resulting pulse-heights and hit times aresent to the Belle II data acquisition system. The detector construction was completed and the detector installed by the summer of 2016, and since then the detector has undergone commissioning. This talk describes the construction and commissioning of the Belle II iTOP counter.
Poster Session and Reception / 279
An overview of the ANNIE experiment at Fermilab
Author: Emrah Tiras1
1 Iowa State University
Corresponding Author: [email protected]
The Accelerator Neutrino Neutron Interaction Experiment (ANNIE) is located at SciBooNE Hall along the Booster Neutrino Beam at Fermilab. It consists of a 23-ton water Cherenkov detector loaded with gadolinium, muon range detector and a veto wall. The main goal of the experiment is to measure the final state neutron multiplicity from charged current neutrino-nucleus interactions within the gadolinium-loaded water. Currently, ANNIE is running in Phase-I and it will be upgraded to Phase-II in the summer, by installing Large Area Picosecond Photodetectors (LAPPDs) in the de- tector. LAPPDs are a novel photodetector technology with single photoelectron time resolutions less than 100 picoseconds, and spatial imaging capabilities to within a single centimeter. They will play a crucial role to separate events of charged-current quasi-elastic (CCQE) interactions and inelastic multi-track charged current interactions. In this talk, we discuss the current status and future plans of the experiment.
Neutrino Physics / 280
Analytic Neutrino Oscillation Probabilities in Matter Revisited.
Author: Stephen Parke1
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1 Fermilab
Corresponding Author: [email protected]
As we enter the precision measurement era for neutrino oscillation physics, it is imperative that our understanding of three flavor neutrino oscillations is also at comparable precision. Even in vacuum, three flavor oscillations is highly none trivial at a precision of 5% or better. Matter effects further complicate three flavor oscillation physics. Here, I will revisit the analytic description of three flavor neutrino oscillation physics as given in recent papers, and discuss their implications for the current generation of neutrino oscillation experiments, in particular T2K and NOvA, and follow up with the next generation of experiments DUNE, T2HKK, and JUNO.
Quark and Lepton Flavor / 281
Recent results of charmed baryon decays at Belle
Author: Bilas Pal1
1 University of Cincinnati
Corresponding Author: [email protected]
We report the recent results of charmed baryon decays, based on the data collected by the Belle experiment at the KEKB collider. This includes the studies of Lambda_c+->phi p pi0, Lambda_c+- >pi+ K- p pi0 and Lambda_c+->pi- K+ p decays.
Poster Session and Reception / 282
The NOvA Data Driven Trigger
Author: Matthew Judah1
1 Colorado State University
Corresponding Author: [email protected]
The NOvA experiment is a long-baseline neutrino experiment utilizing an intense off-axis neutrino beam and two segmented liquid-scintillator-based detectors, a 300t near detector and a 14kt far detector located 810 km from the beam source. The NOvA experiment employs a data-driven trigger system to fully exploit the detectors during non-beam operation. We will present an overview of the NOvA trigger design and implementation, as well as data-driven trigger algorithms currently being used for calibration and a non-beam physics program.
Neutrino Physics / 283
Optimization of the LBNF Neutrino Beam
Author: Rowan Zaki1
1 Radboud University Nijmegen
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Corresponding Author: [email protected]
The Long Baseline Neutrino Facility (LBNF) will use high energy protons impinging on agraphite target to produce kaons and pions, which will be focused by a set of magnetized focusing horns and directed into a decay pipe where they will decay, producing an intense neutrino beam. The neutrino energy spectrum can be tuned by changing a variety of parameters in the beamline such as horn and target shapes. Recent advances in computing power coupled with the development of complex optimization algo- rithms enable identification of parameters that are precisely tuned to optimize physics parameter sensitivity. An optimization of the LBNF beam parameters for sensitivity to CP violation has been performed. The resulting beam design and its physics performance will be discussed, as well engineering modifications to that design and re-optimization incorporating these engineering con- straints. For instance, the horn positions have been revisited and fine tuned, and the amount of material in the downstream target support has been carefully reviewed.
Poster Session and Reception / 284
A Panel Prototype for the Mu2e Straw Tube Tracker at Fermi- lab
Author: Alessandra Lucà1
1 FERMILAB
Corresponding Author: [email protected]
The Mu2e experiment will search for coherent, neutrino-less conversion of muons into electrons in the Coulomb field of an aluminum nucleus with a sensitivity of four orders of magnitude better than previous experiments. The signature of this process is an electron with energy nearly equal tothe muon mass. Mu2e relies on a precision (˜0.1%) measurement of the outgoing electron momentum to separate signal from background. In order to achieve this goal, Mu2e has chosen a very low-mass straw tracker, made of about 20,000 5 mm diameter thin-walled (15 μm) Mylar® straws, held under tension to avoid the need for supports within the active volume, and arranged in an approximately 3 m long by 0.7 m radius cylinder, operated in vacuum and a 1 T magnetic field. Groups of 96 straws are assembled into modules, called panels. We present the prototype and the assembly procedure for a Mu2e tracker panel built at Fermilab.
Higgs and EWSB / 285
Double Gauge Boson Production in the Standard Model EFT
Authors: Ian Lewis1; Julien Baglio2; Sally Dawson3
1 University of Kansas 2 Tubingen U. 3 BNL
Corresponding Author: [email protected]
Precision measurements of the Standard Model are becoming increasingly important at the LHC. Of particular interest is double gauge boson production which are sensitive to the gauge structure of the Standard Model. We investigate W+W- production at the LHC considering all relevant dimension-6 operators and higher order Standard Model corrections. We determine the importance of the higher order corrections and various operators for the interpretation of precision LHC measurements of W+W- production.
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Neutrino Physics / 286
Status of the Electron-Neutrino Charged-Current Inclusive Cross- Section Measurement in NOvA
Authors: Andrew Norman1; Jianming Bian2; Leonidas Aliaga Soplin3; Matthew Judah4; Nitish Nayak5; Norm Buchanan4
1 Fermilab 2 University of California, Irvine 3 College of William and Mary 4 Colorado State University 5 University of California-Irvine
Corresponding Author: [email protected]
The electron-neutrino charged-current inclusive cross section on nuclei is an important inputpa- rameter for electron-neutrino appearance oscillation experiments. There are a small number of mea- surements, with limited statistics, in the few GeV region where current and future long base-line neutrinos experiments operate. The NOvA near detector is located at Fermilab, approximately 800 m from the NuMI beam production target and thus provides an excellent platform to measure and study neutrino interactions and cross sections with high statistics. We present our progress, includ- ing the use of a convolutional visual network (CVN) technique as event classifier, on this neutrino scattering measurement in the energy range of 1-3 GeV with data collected from November 2014to February 2017 in the NOvA near detector.
Dark Matter / 287
LUX, and the Combating of the Lamppost Effect
Author: Matthew Szydagis1
1 University at Albany, SUNY
Corresponding Author: [email protected]
New results from the Large Underground Xenon (LUX) detector, a 100-kg-scale, 2-phase xenon direct dark matter search experiment, will be shared. Dark matter, the missing ˜25% of the mass-energy content of the universe, is sought in new ways, using effective field theory operators to extend the search to higher-mass Weakly Interacting Massive Particles (WIMPs), spin-dependent interaction operators, and electron instead of nuclear recoil, to seek axions. In addition, 2-neutrino double electron capture of 124Xe will be explored. Lastly, both old and new calibrations and position and energy reconstruction techniques will be reviewed, in the context of the new background and signal models being developed by LUX.
Particle Detectors / 288
Front-End Electronics Scheme for the Mu2e Straw Tracker
Author: Manolis Kargiantoulakis1 Co-author: Vadim Rusu 2
1 Fermilab 2 FNAL
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Corresponding Author: [email protected]
The Mu2e tracking chamber consists of ˜21,000 thin straw drift tubes to precisely measure the˜105 MeV/c electron, the distinct experimental signature of coherent muon to electron conversion in the field of a nucleus. The tracker is designed to reconstruct the momentum of conversion electrons with a resolution of <180 keV/c. To achieve this requirement the distance of an electron track from the straw sense wire must be measured with a precision of ˜200 um. The timing of the straw signals is recorded using a TDC implemented in FPGA. Both ends of the straw are read out for a time division measurement which yields the hit position along the straw within 3 cm. The straws are also instrumented with an ADC for charge deposition measurements, which allow the separation of electrons from highly ionizing proton hits. The Mu2e tracker is highly modular with the basic unit being a panel of 96 straws. After amplification and shaping of the straw signals, all the digitization and readout for a panel occur on a high-density integrated board, the DRAC – Digitizer Recorder Assembler and Controller. Interface for data and slow controls communication with the DAQ is provided by a pair of duplex optical fibers, minimizing penetrations through the vacuum where the Mu2e tracker is operated. We will present the scheme for the front-end electronics mounted directly on each basic tracker module, along with performance results from existing prototypes.
Poster Session and Reception / 289
LAr Scintillation Light Detection, Simulation and Analysis in LAr- IAT
Author: Pawel Kryczynski1
1 IFJ PAN, Krakow
Corresponding Author: [email protected]
LArIAT is a Liquid Argon Time Projection Chamber (LArTPC) installed in a charged particle beam at the Fermilab Test Beam Facility. This experiment, currently in its third run of data taking, isex- ploring the response of LAr at particle energies relevant for neutrino experiments. It also serves as a platform to prepare and benchmark the simulation, analysis and reconstruction software, used in LAr neutrino experiments. One of LArIAT’s R&D goals is to develop readout methods for scin- tillation light in LArTPCs. The scintillation light detection system consists of Photomultipliers and Silicon Photomultipliers combined with wavelength-shifter covered reflector foils to enhance the detection efficiency and increase uniformity. This poster will present the methods of using scintil- lation light in LArTPCs to evaluate detector performance, PID and calorimetry and their results in LArIAT.
Precision Electroweak Physics / 290
Monte Carlo Simulations of the PEN experiment: A Precision Measurement of π →eν(γ) Branching Ratio
Author: Charles Glaser1
1 University of Virginia
Corresponding Author: [email protected]
+ + The PEN collaboration performed a precision measurement ofthe π → e νe(γ) branching ratio with the goal of obtaining a relative uncertainty of 5 × 10−4 or better at the Paul Scherrer Institute. A precision measurement of the branching ratio Γ(π → eν¯(γ))/Γ(π → µν¯(γ)) can be used to give mass bounds on “new”, or non V−A, particles and interactions. This ratio also proves to be one of the most sensitive tests for lepton universality. The PEN detector consists of beam counters,
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an active target, a mini-time projection chamber, cylindrical multi-wire proportional chambers, a plastic scintillating hodoscope, and a spherical 240-module pure CsI electromagnetic calorimeter. The Geant4 Monte Carlo simulation is used to construct ultra-realistic events by digitizing energies and times, creating synthetic target waveforms, and fully accounting for photo-electron statistics. We focus on the detailed detector response to signal and background processes in order to sharpen the discrimination between them in the data analysis.
Poster Session and Reception / 291
NNLO QCD Predictions of W and Z Bosons in proton-proton col- lisions at 7, 8, 13, 14 and 100 TeV Center of Mass Energies
Author: Hasan Ogul1
Co-authors: Emrah Tiras 2; Kamuran Dilsiz 3
1 Sinop University, Turkey 2 Iowa State University 3 Bingol University, Turkey
Corresponding Author: [email protected]
Large Hadron Collider has run at 7, 8, 13 TeV but it is expected and planned to collect data at 14 TeV center of mass energy in 2019. Meanwhile, a 100 TeV hadron collider, called Future Circular Collider (FCC), is proposed to be built as a post-LHC particle accelerator. Therefore, we estimated W and Z boson cross sections and their uncertainties at LO, NLO and NNLO QCD using different most modern PDF models to understand the effect of the energy increase from 7 to 100 TeV. The predictions are computed using publicly available parton level Monte Carlo program DYnnlo1.5 and FEWZ 3.1. PDF, strong coupling constant, scale, model and parameterization uncertainties are considered and their size changes by energy increase are investigated.
Neutrino Physics / 293
Project 8: A New Generation of Neutrino Mass Experiment
Author: Ali Ashtari Esfahani1
1 University of Washington
Corresponding Author: [email protected]
A direct measurement of neutrino mass still remains a challenge for today’s particle and nuclear physics. The current state of the art experiment has a projected neutrino mass sensitivity downto 0.2 eV. However the lower limit suggested by the neutrino oscillation measurements is two orders of magnitude smaller. Project 8 is a new generation of direct neutrino mass measurement experiments aiming for sensitivity to the whole neutrino mass ranges allowed by the inverted mass hierarchy. The proof of concept for Cyclotron Radiation Emission Spectroscopy (CRES) as the novel technique for measuring electron energies has been illustrated through spectroscopy of 83mKr lines. We present the phased program to achieve the desired sensitivity with emphasis on the recent advances toward the first measurement of the continuous tritium spectrum.
Neutrino Physics / 294
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Neutrino-Nucleus Deep Inelastic Scattering (DIS) results from MIN- ERvA
Author: Rimal Dipak1
1 University of Florida
Corresponding Author: [email protected]
Neutrino-Nucleus Deep Inelastic Scattering (DIS) events provide a probe into the structure of nucle- ons within a nucleus that cannot be accessed via charged lepton-nucleus interactions. The MINERvA experiment is stationed in the Neutrinos from the Main Injector (NuMI) beam line at Fermi Na- tional Accelerator Laboratory. With the recent increase in average neutrino energy and the greatly increased intensity of the NuMI beam line, projected sensitivities for DIS cross section ratio anal- yses using MINERvA’s suite of nuclear targets (C, CH, Fe and Pb) will be greatly increased. The current state of the field and the projected reach and impacts of these measurements will bedis- cussed.
Neutrino Physics / 296
Recent MINERvA Double Differential CCQE Cross Section Re- sults Using Lepton Kinematics
Author: Vittorio Paolone1
1 University of Pittsburgh
MINERvA’s first CCQE results preferred models with 2p2h-like enhancements. Since thenwork using an inclusive sample measuring reconstructed available energy and three momentum transfer has demonstrated the effect of adding in RPA and 2p2h components to our base GENIE simulation. Further modification via a fit to the inclusive data results in an empirical model which well describes the full two dimensional cross sections in lepton variables, transverse and longitudinal momentum, for both the neutrino and anti-neutrino cases. These cross section results will be compared tothis new model as well as other models.
Neutrino Physics / 297
Nuclear Dependence of Quasi-Elastic Scattering at MINERvA
Author: Vittorio Paolone1
1 University of Pittsburgh
A precise understanding of quasi-elastic interactions is crucial to measure neutrino oscillations. Cur- rent neutrino oscillation experiments use different targets that range from carbon to argon. A sample of neutrino interactions on Fe, Pb, C and CH with one muon and at least one proton candidate is used to study quasielastic-like interactions and the role that the nuclear environment plays in modifying those interactions. Measurements of differential cross sections and ratios of Fe, Pb and C toscin- tillator are presented as a function of four-momentum transferred to the target nucleus, where the momentum transferred is reconstructed using proton kinematics. Comparisons of these measure- ments with the predictions from the GENIE and NuWro event generators will be shown.
Neutrino Physics / 298
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Antineutrino to neutrino charged-current interaction cross sec- tion ratio in MINERvA
Author: Vittorio Paolone1
1 University of Pittsburgh
Corresponding Authors: [email protected], [email protected]
The neutrino and anti-neutrino charged-current inclusive cross sections are important ingredients for current and future neutrino oscillation experiments. MINERvA recently measured these cross sections on carbon, and their ratio, using data from the forward and reversed horn focusing modes of the Fermilab low-energy NuMI beamline. The flux prediction was obtained from a sample of charged-current events at low nuclear recoilen- ergy (ν) along with precise higher energy external neutrino cross section data overlapping our energy regime. Common systematic uncertainties cancel in the extracted antineutrino-neutrino cross sec- tion ratio and reaches a precision of 5% at low energy since we benefit from the fact that the cross-sections are obtained within the same experiment using the same technique. This talk will discuss these results.
Poster Session and Reception / 299
NOvA Short-Baseline Tau Neutrino Appearance Search
Author: Rijeesh Keloth1
Co-authors: Adam Aurisano 2; Alexandre Sousa 2; Gavin S. Davies 3; Louise Suter 4; Robert PLUNKETT 5
1 Cochin University of Science and Technology 2 University of Cincinnati 3 Indiana University 4 FNAL 5 Fermilab
Corresponding Author: [email protected]
Standard three-flavor neutrino oscillations have well explained by a wide range of neutrino exper- iments. However the anomalous results, such as electron-antineutrino excess seen by LSND and MiniBooNE do not fit the three-flavor paradigm. This can be explained by an additional fourthfla- vor sterile neutrino at a larger scale than the existing three flavor neutrinos. The NOvA experiment consists of two finely segmented, liquid scintillator detectors operating 14 .6 mrad off-axis fromthe NuMI muon-neutrino beam. The Near Detector is located on the Fermilab campus, 1 km fromthe NuMI target, while the Far Detector is located at Ash River, MN, 810 km from the NuMI target. The NOvA experiment is primarily designed to measure electron-neutrino appearance attheFar Detector using the Near Detector to control systematic uncertainties; however, the Near Detector is well suited for searching for anomalous short-baseline oscillations. This poster will present a novel method for selecting tau neutrino interactions with high purity at the Near Detector using a convolu- tional neural network. Using this method, the sensitivity to anomalous short-baseline tau-neutrino appearance due to sterile neutrino oscillations will be presented.
Neutrino II / 300
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Measurement of Electron Attenuation using Cosmic Ray Muons in the MicroBooNE Detector
Author: Varuna Meddage1
1 Kansas State University
Corresponding Author: [email protected]
The MicroBooNE experiment at Fermilab uses liquid argon time projection chamber (LArTPC) tech- nology to study neutrino interactions in argon. A fundamental requirement for LArTPCs is to achieve and maintain a low level of electronegative contaminants in the liquid to minimize the cap- ture of drifting ionization electrons. The attenuation time for the drifting electrons shouldbelong compared to the maximum drift time, so that the signals from particle tracks that generate ioniza- tion electrons with long drift paths can be detected efficiently. In this talk, we present MicroBooNE’s measurement of electron attenuation using cosmic ray muons. The result yields a minimum electron 1/e lifetime of 18 ms under typical operating conditions, which is long compared to the maximum drift time of 2.3 ms.
Particle Detectors / 301
Overview of the Fourth Flight of the ANITA Experiment
Author: Andrew Ludwig1
1 University of Chicago
Corresponding Author: [email protected]
ANITA is a NASA balloon-borne radio (200-1200 MHz) telescope with a primary goal of detecting coherent radio emission from ultra-high-energy (UHE) neutrinos. The fourth flight of ANITA re- cently flew over Antarctica from Dec 2, 2016 through Dec 29, 2016. The best limit to date ontheflux of the highest energy (10ˆ19.5 eV and above) neutrinos comes from previous flights of the ANITA experiment. I will be summarizing some of the upgrades of the instrument for the fourth flight, in- cluding tunable, switchable notch filters and an improved trigger. I will also discuss the ongoing data analysis.
Particle Detectors / 302
Studies of GaInP based Geiger-mode APD arrays
Author: Bob Hirosky1 Co-authors: Brad Cox 2; Grace Cummings 3; Shannon Zelitch 4; Thomas Anderson 4
1 Virginia 2 University of Virginia 3 Virginia Commonwealth University 4 U. Virginia
Corresponding Authors: [email protected], [email protected]
Devices composed of wide band gap semiconductors such as GaInP have the theoretical potential to withstand many orders of magnitude larger radiation exposures compared to silicon. LightSpin Technologies has developed high density, large area SPAD arrays in GaInP with resolution for single photon peaks over the past several years. We
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report on measurements using a sample of the latest generation of prototype devices, demonstrating performance properties of new large GAPD arrays based on this compound semiconductor.
Neutrino Physics / 303
The LArIAT Experiment
Author: Gregory Pulliam1
1 Syracuse University
Corresponding Author: [email protected]
The Liquid Argon Time Projection Chamber in a Test Beam (LArIAT) experiment at the Fermilab’s Test Beam Facility exposes a liquid argon time projection chamber (LArTPC) to a test beam to study LArTPC responses to a variety of charged particles. Event identification and reconstruction tech- niques as well as cross section measurements from LArIAT will provide critical input to existing liquid argon neutrino experiments such as MicroBooNE, SBND, and ICARUS as well as help to improve future precision neutrino measurements in the Deep Underground Neutrino Experiment (DUNE). The work presented here includes an overview of the physics program of the LArIAT ex- periment as well as a new result on the inclusive pion-argon cross-section measurement recently completed.
Poster Session and Reception / 304
Calibration of gBlocks using Offline Jets for the gFEX Subsystem of the ATLAS Level 1 Calorimeter Trigger
Author: Ian Snyder1
1 University of Oregon
Corresponding Author: [email protected]
The Global Feature Extractor (gFEX) subsystem of the ATLAS Level 1 calorimeter trigger will identify large-radius jets, which are typical of Lorentz-boosted objects. Here I present results from calibrating gBlocks, groups of towers, using offline R=0.4 jets. Dijet Monte Carlo simulation samples at acenter of mass energy of 13 TeV are used to find calibration factors. Effects on energy resolution are studied as well.
Dark Matter / 305
Background Simulations for the LUX-ZEPLIN Experiment
Author: Amy Cottle1
1 Fermi National Accelerator Laboratory
Corresponding Author: [email protected]
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The LUX-ZEPLIN experiment will use a seven tonne dual-phase xenon TPC for the direct detection of dark matter. Understanding and mitigating background signals are crucial in its aim topush an unprecedented sensitivity for WIMPs. I will describe the methods used to assess these, including simulations that characterise the electron and nuclear recoil responses in the detector from both internal and external background sources. Combined with the results of ongoing radioactive as- says, these give an estimate of the expected background rates. Suppression of these backgrounds is achieved through fiducialisation and a veto strategy involving anti-coincidence between themain TPC and outer detectors (an instrumented xenon ‘skin’ and liquid scintillator detector). Under the present background model, LZ is projected to have a baseline sensitivity, with 1000 live days, of 2.3 x 10-48 cm2 for a 40 GeV/c2 WIMP mass.
Neutrino Physics / 306
Recent results of EXO-200 and R&D progress of nEXO
Author: Matthew Coon1
1 University of Illinois at Urbana-Champaign
Corresponding Author: [email protected]
The Enriched Xenon Observatory (EXO) looks for the neutrinoless double-beta decay of Xe136with a very low-background time projection chamber filled with approximately 170 kg Xe enriched to approximately 80%. Observation of this rare decay mode would signify the Majorana nature of neutrinos and new physics beyond the Standard Model. EXO-200 has already set one of the most stringent limit for the half-life of this lepton-violating process. The detector was upgraded with new front-end electronics and a radon suppression system in 2016. New Results from EXO-200 will be presented together with R&D progress of nEXO, a proposed 5 tonne scale experiment.
Beyond Standard Model / 308
New Search for Mirror Neutrons at HFIR
Author: Leah Broussard1
1 Oak Ridge National Laboratory
Corresponding Author: [email protected]
The theory of “mirror matter” predicts a hidden sector made up of a copy of the StandardModel particles and interactions but with opposite Parity. If mirror matter interacts with ordinary matter, there would be experimentally accessible implications in the form of neutral particle oscillations. Direct searches for neutron oscillations into mirror neutrons in a controlled magnetic field have previously been performed using ultracold neutrons in storage/disappearance measurements, with some inconclusive results for oscillation times of T ˜ 10 s. We will describe a proposed disappearance and regeneration experiment in which the neutron oscillates to and from a mirror neutron state. This experiment will be performed using the existing GP-SANS instrument at the High Flux Isotope Reactor at Oak Ridge National Laboratory with modest modifications, and could have the sensitivity to exclude up to T < 15 s.
Cosmology and Astrophysics / 309
TeV Particle Astrophysics with the High Altitude Water Cherenkov (HAWC) Detector
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Author: Kirsten Tollefson1
1 Michigan State University
Corresponding Author: [email protected]
The High Altitude Water Cherenkov (HAWC) Gamma-ray Observatory was completed inMarch 2015 and is now giving us a new view of the sky. HAWC is a continuously operating, wide field-of- view observatory situated near Puebla, Mexico that observes 0.5–100 TeV gamma rays. It is 15 times more sensitive than previous generation Extensive Air Shower gamma-ray instruments and is able to detect the Crab nebula at >5σ a day. HAWC operates 24 hrs/day with >95% on-time and observes the entire overhead sky (˜2 sr) serving as a TeV “finder” telescope for Imaging Atmospheric Cherenkov Telescopes (IACTs). It monitors the same sky as gamma-ray satellites (Fermi), gravity-wave (LIGO) detectors and neutrino observatories (IceCube) allowing for multi-wavelength and multi-messenger observations. I will present highlights from HAWC’s first year and half of operations.
Poster Session and Reception / 310
Cross Section Predictions of W/Z + Jets at LHC
Author: Kamuran Dilsiz1
Co-authors: Emrah Tiras 2; Hasan Ogul 3
1 Bingol University, Turkey 2 Iowa State University 3 Sinop University, Turkey
Corresponding Author: [email protected]
Cross section predictions of W and Z bosons in association with jets (up to 6 jets) are presented using Alpgen MC generator with CTEQ6L1, a leading order parton distribution function (PDF). This study has been performed at center of mass energies of √s= 7, 8, 13, 14 TeV. To validate the results, a detailed comparison of cross section predictions is performed with the measured results by CMS and ATLAS collaborations. In addition, NLO QCD predictions are performed up to 2 jets using MCFM-8.0 MC generator.
Particle Detectors / 311
Normalizing to the Number of Stopped Muons in the Mu2e Ex- periment
Author: Nam Tran1
Co-author: Fermilab for the Mu2e Collaboration 2
1 Boston University, Depatrment of Physics 2 Fermilab
Corresponding Authors: [email protected], [email protected]
The Mu2e experiment aims to search for coherent, neutrino-less muon-to-electron conversion in aluminum at a single event sensitivity of 3E-17, a factor of 10,000 improvement from the current experimental limit. In order to achieve this goal, the denominator of the branching ratio, i.e. the number of muons captured in the aluminum stopping target,
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must be measured to a precision of 10%. A sub-system of the Mu2e experiment, called the Stopping Target Monitor (STM), will measure the X-rays and gamma rays emitted as muons are captured in the stopping target. The proposed method, simulation results of detector performance, and baseline design will be described.
Particle Detectors / 312
Preliminary Results from the AlCap Experiment
Author: John Quirk1 Co-author: Paul Scherrer Institut AlCap Collaboration 2
1 Boston University 2 PSI
Corresponding Author: [email protected]
Observation of neutrinoless muon-to-electron conversion in the presence of a nucleus would be un- ambiguous evidence of physics Beyond the Standard Model. Two experiments, COMET at J-PARC and Mu2e at Fermilab, will search for this process in the coming decade. Barring discovery, these ex- periments will provide upper-limits on this branching ratio up to 10,000 times better than previously published. COMET/Mu2e developed a joint venture, the AlCap Experiment, to measure particle emission spec- tra from muonic interactions in a number of materials. As a significant background process in COMET/Mu2e, AlCap sought to measure the charged particle and neutron spectra following nuclear capture on the candidate target materials aluminum and titanium. Additionally, COMET/Mu2e are exploring normalization schemes via AlCap’s measurement of the photon spectra following both atomic and nuclear capture. Over the course of 2013 and 2015, AlCap performed three runs at the Paul Scherrer Institut in Switzer- land. Preliminary results are presented and compared across all runs.
Particle Detectors / 313
Mu2e Solenoid Field Mapping System
Author: Brian Pollack1 Co-authors: Charles Orozco 2; Horst Friedsam 3; Huyue Zhao 4; James Grudzinski 4; Jefferey White 4; Jerzy Nogiec 3; Luciano Elementi 5; Michael Lamm 5; Michael Schmitt 1; Richard Talaga 4; Robert Wagner 5; Sandor Feher 5; Thomas Strauss 3
1 Northwestern University 2 University of Illinois at Urbana-Champaign 3 FNAL 4 Argonne National Laboratory 5 Fermilab
Corresponding Author: [email protected]
The Mu2e experiment at Fermilab aims to search for charged-lepton flavor violation by lookingfor muon to electron conversion in the field of the nucleus. The concept of the experiment is togenerate a low momentum muon beam, stopping the muons in a target and measuring the momentum of the conversion electrons. The implementation of this approach uses a non-trivial magnetic field inorder
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to steer charged particles and measure the electron momenta. Precise knowledge of the magnetic field is crucial for the experiment. This presentation will describe the Field Mapping System atMu2e, which will survey the magnetic field and then use that data to produce a semi-analytical continuous field map. The strict goals and requirements on the accuracy of the resultant field map leadtoanovel combination of fundamental physics and state-of-the-art data analysis and computation.
Poster Session and Reception / 314
Skimming tau neutrinos and tau showers in the atmosphere
Author: Mary Hall Reno1
Co-authors: INA SARCEVIC 2; Minh Vu Luu 1; Yu Seon Jeong 3
1 University of Iowa 2 UNIVERSITY OF ARIZONA 3 University of Arizona
Corresponding Author: [email protected]
A technique to detect an astrophysical or cosmic high energy tau neutrino flux involves using the Earth as a neutrino converter. Taus produced near enough to the surface of the Earth can emerge and decay to produce atmospheric showers. The neutrino cross section, energy transfer to the tau, and tau energy loss via electromagnetic interactions will be discussed with applications to surface- and satellite-based detectors. The sensitivity of event rates to calculational approaches to the elec- tromagnetic structure functions will be emphasized.
Computing, Analysis Tools, and Data Handling / 315
Exploration of Deep Convolutional and Domain Adversarial Neu- ral Networks in MINERvA.
Author: Jonathan Miller1
Co-authors: Anushree Ghosh 1; Gabriel Perdue 2
1 Universidad Técnica Federico Santa María 2 Fermilab
Corresponding Author: [email protected]
While Machine Learning algorithms have been used for decades, recent advances in Deep Convo- lutional Neural Networks have revolutionised the fields of computer vision and image recognition and Artificial Intelligence. Modern particle physics experiments and detectors produce data which is analogous to modern high resolution images, and we anticipate a similar revolution in particle physics. Three central challenges have been faced in using these ML algorithms: feature extrac- tion, (hyper-)parameter tuning and the validity of applying an algorithm on data which was trained and tested on simulation. We present our exploration of using DCNNs and Domain Adversarial Neural Networks to address, respectively, the first and last of these challenges in the task of vertex reconstruction in the passive targets of the MINERvA detector in the medium energy NuMI neutrino beam.
Neutrino II / 316
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MicroBooNE Investigation of Low-Energy Excess Using Deep Learn- ing Algorithms
Author: Lauren Yates1
1 Massachusetts Institute of Technology (MIT)
Corresponding Author: [email protected]
MicroBooNE is a neutrino experiment based at Fermilab which consists of a liquid argon time- projection chamber in the Booster Neutrino Beam (BNB). The experiment aims to investigate the excess of electron neutrino-like events seen by the MiniBooNE experiment, also located in the BNB, which is potential evidence for new non-Standard Model physics such as sterile neutrinos. In this talk, I will discuss the status of our search for low-energy electron neutrino interactions within the MicroBooNE detector. This analysis features a hybrid approach of traditional reconstruction meth- ods along with the use of convolutional neural networks (CNNs), a type of deep learning algorithm highly adept at pattern recognition. This talk will describe the selection of events and thewaysin which the CNNs are used. It will also outline the ways we are addressing issues related to applying CNNs, which are trained on simulated data, to data from the detector.
Particle Detectors / 317
Studies with the LArIAT Light Collection System
Author: Monica Nunes1
1 UNICAMP
The detection of scintillation from particles in liquid argon time projection chambers (LArTPCs) serves a crucial role in triggering and interaction timing for liquid argon neutrino experiments, with potential to enhance calorimetry and particle identification efficiency as well. The LArIAT experi- ment provides an opportunity to explore new ideas for light collection in LArTPCs in a controlled test beam environment. Two cryogenic photomultiplier tubes (PMTs) and several varieties of silicon photomultipliers (SiPMs) mounted to custom preamplifier boards are suspended behind the LArIAT TPC’s wireplanes. Reflective foils coated in tetraphenyl butadiene (TPB) line the field cagewalls to down-shift scintillation vacuum-ultraviolet (VUV) photons into detectable visible light. Inthe most recent run, this configuration was changed to having a transparent cathode with TPB coated reflector foils mounted behind to more closely mimic proposed upcoming neutrino experiments. Ad- ditionally, a new light detection device (the ARAPUCA) was deployed for R&D studies. Analyses are underway which use this light to identify and study Michel electrons, improve particle identifi- cation, and enhance calorimetry of beam particles by combining light with total charge collected on the wireplanes.
Dark Matter / 318
The LUX-Zeplin Dark Matter Search: detector design and sensi- tivity
Author: Maria Elena Monzani1
1 SLAC National Accelerator Laboratory
Corresponding Author: [email protected]
The nature and origin of Dark Matter are among the most compelling mysteries of contemporary science. For over three decades, physicists have been trying to detect Dark Matter particles via collisions on target nuclei, with little success.
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The LZ collaboration is designing a massive Dark Matter detector, to be installed at the 4850levelof the Sanford Underground Research Facility in Lead, South Dakota. This detector will feature 7 active tons of target nuclei and use the established liquid xenon TPC technology to achieve unprecedented sensitivity to a wide range of Dark Matter candidates. In this talk, I will discuss the design and sensitivity of the experiment, together with its status.
Neutrino Physics / 319
Extracting neutrino oscillation parameters using a simultaneous fit of the nue appearance and numu disappearance data inthe NOvA experiment
Author: Prabhjot Singh Singh1
1 Department of Physics and Astrophysics, University of Delhi, India
Corresponding Author: [email protected]
NOvA is a two detector, long baseline neutrino oscillation experiment designed to study nue (anti nue) appearance and numu (anti numu) disappearance in a numu (anti numu) beam produced at Fermilab. The near detector (ND) is located 100 meters underground at a distance of 1kmfromthe target whereas the far detector (FD) is located on the surface, 810 km away from the beam source in Ash River, MN. The ND is used to measure the beam before oscillations and the FD measuresthe oscillated spectrum. The ND and the FD are functionally identical detectors and the ND spectra are extrapolated to the FD to predict the signal and background spectra expected in the FD. I will present the extrapolation and data fitting techniques developed for these analyses within NOvA.
QCD / 320
Quarkonium Production in Jets
Author: Thomas Mehen1 Co-authors: Adam Leibovich 2; Lin Dai 2; Reggie Bain 1; Yiannis Makris 1
1 Duke University 2 Pitt. U.
Corresponding Author: [email protected]
This talk will describe new tests of quarkonium production using quarkonia that are produced within jets. We study the distribution in the fraction z of a jet’s longitudinal momentum carried by the quarkonium. The z distribution is sensitive to the underlying NRQCD production mecha- nism. Analytic calculations the z distributions in SCET that incorporate Next-to-Leading-Log (NLL) resummation disagree with default PYTHIA predictions. We describe a modified simulation method which agrees well with NLL analytic calculations. This method is then successfully applied tore- cent LHCb measurements of J/ψ within jets. We discuss the implications of this measurement for extractions of NRQCD long-distance matrix elements. Finally, we discuss other observables involv- ing quarkonium within jets which may be useful for discriminating between NRQCD production mechanisms.
Particle Detectors / 321
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Detecting Axions with Superconducting Qubits
Author: Akash Dixit1
Co-authors: Aaron Chou 2; David Schuster 3
1 University of Chicago 2 Fermilab 3 U.Chicago
Corresponding Author: [email protected]
The Axion Dark Matter eXperiment (ADMX) aims to detect dark matter axions converting tosingle photons in a resonant cavity bathed in a uniform magnetic field. A qubit (two level system) op- erating as a single microwave photon detector is a viable readout system for ADMX and may offer advantages over the quantum limited amplifiers currently used ADMX. When weakly coupled tothe detection cavity, the qubit transition frequency is shifted by an amount proportional to the cavity photon number. Through spectroscopy of the qubit, the frequency shift is measured and thecavity occupation number is extracted. At low enough temperatures, this system would allow sensitivities exceeding that of the standard quantum limit.
Dark Matter / 322
Dark Matter Searches with HAWC
Author: J. Patrick Harding1
1 Los Alamos National Laboratory
Corresponding Author: [email protected]
The High Altitude Water Cherenkov (HAWC) gamma-ray observatory is a wide field-of-view ob- servatory sensitive to 0.5 TeV - 100 TeV gamma-rays and cosmic-rays. The HAWC observatory performed an indirect search for dark matter via GeV-TeV photons resulting from dark matter an- nihilation and decay considering various sources, including dwarf spheroidal galaxies (dSphs), the M31 galaxy, and the Virgo cluster. HAWC has not seen statistically significant excess from these sources. We searched for dark matter annihilation and decay at dark matter masses above 1TeV, including masses higher than 70 TeV that are currently unconstrained. We will present the annihi- lation cross-section and decay lifetime limits.
QCD / 323
Refinement of the Pion PDF implementing Drell-Yan Experimen- tal Data
Author: Patrick Barry1
Co-authors: Chueng-Ryong Ji 1; Nobuo Sato 2; Wally Melnitchouk 3
1 North Carolina State University 2 University of Connecticut 3 Jefferson Lab
Corresponding Author: [email protected]
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The proton is more complex than a collection of three valence quarks. We realize that an abundance of “sea” quarks and gluons is crucial to understanding the mass and internal structure of the proton. The pion is intimately related with the proton as analyses indicate an effective pion cloudexists around the core valence structure. In the Drell-Yan (DY) process, two hadrons (such as protons or pions) collide, one donating a quark and the other donating an antiquark. The quark-antiquark pair annihilate, forming a virtual photon, which creates a lepton-antilepton pair. By measuring the cross-section of the dilepton pair, we obtain rich information about the parton distribution function (PDF) of the hadrons. The PDF is the probability of finding a parton (quark, antiquark, or gluon) ata momentum fraction of the hadron, x, between 0 and 1. Experiments performed at Fermilab such as E866 and SeaQuest collect data in the DY process. Determining the pion PDFs from the DY process stems from understanding the abundance of sea quarks. Complementary to the DY process is deep inelastic scattering (DIS). Here, a target nucleon is probed by a lepton, and we investigate thepion cloud of the nucleon. The experiments H1 and ZEUS done at HERA at DESY collect DIS data. Both DY and DIS processes can measure small and large x depending on kinematics. Numerically, we have implemented the DY cross-section and have obtained the result consistent with (Becher, et al. 2008). Now, we perform a double-Mellin transform on the hard-scattering kernel to easily evolve the PDFs over energy scales as in (Stratmann and Vogelsang, 2001). We present some preliminary fits of pion PDFs to DY datasets from Fermilab-E615 and CERN-NA10. We aim to perform a full NLO QCD global analysis and a state-of-the-art fitting technique to all available data for DY and DISas in (McKenney, et al. 2016) to determine pion PDFs more accurately in all x regions.
Particle Detectors / 324
Optical Ring Resonators for HEP and Cosmology Applications
Author: Stephen Kuhlmann1
1 Argonne National Laboratory
Corresponding Author: [email protected]
Optical ring resonators have been used in telecommunications and other fields, but so far not in HEP. Used as wavelength notch filters, they could have a major impact in reducing infrared sky background for future cosmology surveys. Ring resonators also are a potential low mass, low power, fast, and compact technology for readout of pixel tracking detectors and/or implementing pattern triggering. We describe a current R&D effort in fabrication and testing prototype optical ring resonators for multiple HEP applica- tions.
Poster Session and Reception / 325
Design, construction and characterization of a three channel of cosmic ray detector
Author: Oscar Eduardo Moreno Palacios1
Co-authors: Everardo Granados Vazquez 1; Julián Félix Valdez 1; Luis Jorge Arceo Miquel 1
1 Universidad de Guanajuato
Corresponding Author: [email protected]
Cosmic rays are particles generated by astrophysical sources, which currently are studied for their physical properties. Cosmic rays research can be used to improve technology, for instance, spec- troscopy for material identification. A three-channel detector was built using three photo-multipliers, two scintillation plastic and several common materials, water, air, oil, aluminum, and others, to scan.
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They were allocated in vertical position, where material to scan channel is between scintillation plastics channels in order to validate the signal and study the interaction of cosmic rays with the different materials. Details of characterization, operation and some preliminary physical results are reported.
Accelerators / 326
Beam Line Extinction in the Mu2e Experiment
Author: Eric Prebys1
Co-authors: Andrei Gaponenko 1; Larry Bartoszek 2; Matthew Jones 3; Peter Kasper 1; Steve Werkema 1; Vladimir Nagaslaev 1
1 Fermilab 2 Bartoszek Engineering 3 Purdue University
The Mu2e Experiment will search for the conversion of an muon to an electron in the fieldofanu- cleus with four orders of magnitude greater sensitivity than the previous best search. The experiment requires a beam consisting of short (˜200 ns FW) proton bunches, separated by 1.7 microseconds, with no out of time beam at a fractional level of 1e-10 or lower. This last requirement is referred to as “extinction”. This talk describes the production of the required beam, including extinction, aswell as the technique for verifying that the required level of extinction has been achieved.
Neutrino Physics / 327
New Measurement of Atmospheric Neutrino Oscillations with Ice- Cube
Authors: Joshua Hignight1; João Pedro Athayde Marcondes de André1; Tyce DeYoung1
1 Michigan State University
Corresponding Author: [email protected]
The DeepCore infill array of the IceCube Neutrino Observatory enables observations of atmospheric neutrinos with energies as low as 5 GeV. Using a set of 40,000 neutrino events with energies ranging from 5.6 - 56 GeV recorded during three years of DeepCore operation, we measure the atmospheric 2 oscillation parameters θ23 and ∆m32 with precision competitive with long-baseline neutrino experi- ments, by observing distortions in the neutrino energy-zenith angle distribution. Our measurements are consistent with those made at lower energies, and prefer a value of θ23 close to maximal.
Computing, Analysis Tools, and Data Handling / 328
Histogram Binning with Bayesian Blocks
Author: Brian Pollack1
Co-authors: Michael Schmitt 1; Saptaparna Bhattacharya 2
1 Northwestern University
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2 Brown University
Corresponding Author: [email protected]
The Bayesian Block algorithm, originally developed for applications in astronomy, can beusedto improve the binning of histograms in high energy physics. Along with visual improvements, the his- togram produced from this algorithm is a non-parametric density estimate, providing a description of background distributions that do not suffer from the arbitrariness of ad-hoc analytical functions. The statistical power of a hypothesis test based on a Bayesian Blocks binned template isnearlyas good as one obtained by fitting analytical functions. This presentation will showcase the visualand statistical benefits of the Bayesian Blocks algorithm on a handful of examples based oncommon HEP analyses.
Poster Session and Reception / 329
Towards a new approach to cosmology with the Dark Energy Sur- vey and Gravitational Waves
Author: Marcelle Soares-Santos1
Co-authors: Bobby Butler 1; Brian Yanny 2; Daniel Holz 3; Hsin-Yu Chen 4; James Annis 1; Juan Garcia-Bellido 5; Kenneth Herner 1; Masao Sako 6; Rick Kessler 4; Zoheyr Doctor 4
1 Fermilab 2 FNAL 3 University of Chiago 4 University of Chicago 5 UAM-Spain 6 UPenn
Corresponding Author: [email protected]
Motivated by the exciting prospect of new wealth of information that will arise from observations of gravitational and electromagnetic radiation from the same astrophysical phenomena, we have established a program to search for optical counterparts to LIGO/Virgo events using the the Dark Energy Camera (DECam). The project is performed in a broad collaboration including members of the Dark Energy Survey (DES) Collaboration, the LIGO/Virgo Collaboration, and the community at large. Its success has motivated us to pursue a new survey with DECam: the Blanco Images of the Southern Sky (BLISS) survey. BLISS expands the DECam sky coverage beyond the areas covered by DES and will increase the efficiency of our searches. In this talk, I present an overview of this effort, including results of searches for signatures of the first two binary black hole mergers detected by LIGO in the 2015-2016 observing campaign and status of the ongoing 2016-2017 campaign. I will also discuss plans for upcoming seasons and long term prospects for this exciting emerging field: multi-messenger cosmology with gravitational waves and optical data.
Poster Session and Reception / 330
DES & Planck survey: Galaxy group-tSZ cross correlation
Authors: James Annis1; Marcelle Soares-Santos1; Vinu Vikraman2; Yuanyuan Zhang3
1 Fermilab 2 Argonne National Lab 3 University of Michigan
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Corresponding Author: [email protected]
Stacking Sunyaev-Zeldovich map of groups and clusters is powerful tool to find average distribution of hot gas in these systems. The goals of this work are to estimate the redshift evolution of SZsignal and average bias weighted electron pressure of the universe. We stack SZ signal from Planck at all the detected redmapper groups from year 1 Dark Energy Survey data. We use groups at different redshift and mass to find the average pressure profile of these systems. We show that thedetected signal can be modeled by a halo model using Battaglia pressure profile. After the modeling weshow that there is an evolution in the pressure profile in the groups and we estimate the average thermal energy of the universe.
332
Standard Model EFT and Extended Scalar Sectors
Author: Christopher Murphy1
Co-author: Sally Dawson 2
1 Brookhaven National Laboratory 2 BNL
Corresponding Author: [email protected]
One of the simplest extensions of the Standard Model is the inclusion of an additional scalar multi- plet, and we consider scalars in the SU(2)L singlet, triplet, and quartet representations. We examine models with heavy neutral scalars, mH ∼ 1−2 TeV, and the matching of the UV complete theories to the low energy effective field theory. We demonstrate the agreement of the kinematic distribu- tions obtained in the singlet models for the gluon fusion of a Higgs pair with the predictions of the effective field theory. The restrictions on the extended scalar sectors due to unitarity and precision electroweak measurements are summarized and lead to highly restricted regions of viable parameter space for the triplet and quartet models.
Cosmology and Astrophysics / 333
Galaxy Cluster Science Results with the Dark Energy Survey
Author: Yuanyuan Zhang1
1 Fermilab
Corresponding Author: [email protected]
Constraining LambdaCDM cosmology with galaxy cluster abundance is one of the fundamental goals for the Dark energy survey (DES). Based on observations collected in the first year, DES has identified many thousands of clusters out to redshift 1.0. Weak lensing and multi-wavelength studies with X-ray data and cosmic microwave background are performed to provide inputs to the cosmol- ogy constraint analysis. Astrophysical studies to understand cluster evolution over time is yielding fruitful results. This presentation will present DES science results from galaxy cluster cosmology and astrophysics studies.
Poster Session and Reception / 334
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Photometric Properties and Stellar Masses in Dark Energy Survey Galaxy Clusters
Authors: Brian Welch1; Brian Welch2 Co-authors: Antonella Palmese 3; Huan Lin 4; James Annis 4; Marcelle Soares-Santos 4
1 University of Chicago 2 University of Chicago/Fermilab 3 Fermilab/UCL 4 Fermilab
Corresponding Authors: [email protected], [email protected]
We present the results of a study of the properties of clusters, selected using the RedMaPPer tech- nique, from the Dark Energy Survey Year 1 data, which cover an area of nearly 2000 square degrees on the sky. We calculate cluster membership probabilities and use a Gaussian mixture model method to characterize the red sequence and blue cloud components of our clusters, and we will present our results on properties such as red sequence peak color, slope, and width, and cluster blue fraction, in particular as functions of redshift. Moreover, we introduce a new cluster stellar mass observable, mu*, and will show that it works as a reliable mass proxy for cosmology by comparing our predic- tions to X-ray measurements. Finally, we will show our results for the redshift evolution of the stellar masses and star formation rates in our cluster member galaxies.
Poster Session and Reception / 335
A search for BH dark matter using microlensing in the Dark En- ergy Survey
Author: James Annis1 Co-authors: Alex Drlica-Wagner 1; Eric Neilsen 1; Juan Garcia-Bellido 2; Marcelle Soares-Santos 1
1 Fermilab 2 IFT UAM-CSIC
Corresponding Author: [email protected]
Massive Primordial Black Holes (MPBH) generated from large inflation-era curvature fluctuations that reenter during the radiation era could constitute the majority of the dark matter, an idea revived by the LIGO observations of merging 30 solar mass black holes. In this model, the mass distribution of MPBH ranges from 0.01 to 100 solar masses, peaking perhaps at 50 solar masses. There is, re- markably, a window in the constraints at these masses; furthermore the MPBH could be clustered, breaking one of the assumptions of microlensing limits. We describe a project that uses the Dark En- ergy Survey data to perform a microlensing measurement of massive compact objects at 10-100 solar masses. The key idea is that a microlensing event has a duration of t = 2.5 years (M/10M_solar)ˆ{1/2} and thus masses in the range expected for MPBH are observable in the DES. The DES observes its entire footprint twice per year per bandpass, so there are 8 usable visits per year as microlensing is achromatic. The primary difference between this project and the MACHO/OGLE/EROS surveys is that we will use the 10ˆ7 field stars in the DES south galactic cap and not the LMC or Galactic Center. We will describe our expected limits on MPBH mass distributions assuming they make up all of the dark matter.
Top Quark Physics / 336
Measuring Polarized Gluon Distributions by Heavy Quark Spin Correlations and Polarizations
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Author: Gary Goldstein1
1 Tufts University
Corresponding Author: [email protected]
The production of heavy flavor quark pairs, including top-anti-top, at the LHC proceeds primarily through gluon fusion. The correlation between the gluon spins affects various spin correlations be- tween the produced quark and anti-quark. Both single spin asymmetries and double correlations of the quark pair spins will be manifest in the subsequent hadronization and decay distributions. For top pairs this is most pronounced. Dilepton, single lepton, and purely hadronic top pair de- cay channels allow for the extraction of gluon spin information as well as providing a window into possible interactions Beyond the Standard Model. The derivations of many spin related asymme- tries and polarizations will be presented. The implications for experimental determination will be discussed.
Poster Session and Reception / 337
Charged Lepton Flavor Violation in Electron-Positron Scattering: Calculations of Cross Section and Asymmetry Using an Effective Field Theory
Authors: Alexey Petrov1; Ching Li2
1 Wayne State University / MCTP 2 Haverford College
Corresponding Author: [email protected]
We performed theoretical calculations of charged lepton flavor violation (CLFV) cross sections and asymmetries in electron-positron scattering. Examples of CLFV include electron antitau final states and electron antimuon final states. We used an effective field theory that incorporated three typesof Beyond Standard Model operators: leptonic operators and radiative operators leading to tree-level diagrams and quark-lepton operators leading to a one-loop diagram. The one-loop diagram was treated in two ways: perturbatively using Standard Model Feynman Rules and non-perturbatively using dispersion relations to account for possible resonance effects. We calculated constraints on the effective coupling constants from current experimental upper bounds. Future colliders suchas Belle II and BES III can use our calculations in searches for charged lepton flavor violation.
Poster Session and Reception / 338
Zero-Range Effective Field Theory for Resonant Wino Dark Mat- ter
Author: Evan Johnson1 Co-authors: Eric Braaten 1; Hong Zhang 2
1 Ohio State University 2 The Ohio State University
Corresponding Author: [email protected]
The most dramatic “Sommerfeld enhancements” of neutral-wino-pair annihilation occur whenthe wino mass is tuned to near critical values where there is a zero-energy S-wave resonance at the neutral-wino-pair threshold. If the wino mass is larger than the critical value, the resonance is a
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wino-pair bound state. If the wino mass is near a critical value, low-energy winos can be described by a zero-range effective field theory in which the winos interact nonperturbatively through acontact interaction. The effective field theory is controlled by a renormalization group fixed pointatwhich the neutral and charged winos are degenerate in mass and their scattering length is infinite. The parameters of the zero-range effective field theory can be determined by matching wino scattering amplitudes calculated by solving the Schrödinger equation for winos interacting through a potential due to the exchange of weak gauge bosons. The power of the zero-range effective field theory is illustrated by calculating the rate for formation of the bound state in the collision of two neutral winos through the emission of two soft photons.
Poster Session and Reception / 339
Impact of Neutrino Decay on Sterile Neutrino Search in IceCube
Authors: Alexander Moss1; Carlos Arguelles1; Janet Conrad1; Marjon Moulai1
1 MIT
Corresponding Author: [email protected]
Anomalies in short-baseline neutrino experiments have suggested the existence of a ˜1 eV sterile neu- trino. IceCube, an ice-Cherenkov neutrino detector at the South Pole is an ideal testing ground for such neutrinos, but recent searches have found no evidence for them. In a 3+1 sterile neutrino model, decay of the heaviest mass eigenstate to lighter eigenstates is largely unconstrained and could mod- ify the results of the searches in IceCube. We present the results of a phenomenological study where neutrino decay is included as a sub-leading effect to oscillation in a 3+1 model in IceCube.
Quark and Lepton Flavor / 340
Flavor gauge models below the Fermi scale
Author: Pedro Machado1 Co-authors: Alexander Friedland 2; Irina Mocioiu 3; K.S. Babu 4
1 Fermilab 2 SLAC 3 Pennsylvania State University 4 Oklahoma State University
Corresponding Author: [email protected]
In this talk I will construct a flavor model with a gauge boson below the weak scale. The modelis viable and shows the synergy between low energy observables, meson decays, neutrino oscillations, and LHC physics. The role of neutrinos will be highlighted.
Higgs and EWSB / 341
Mass Dependence of Higgs Production at Large Transverse Mo- mentum
Author: Eric Braaten1
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Co-author: Hong Zhang 2
1 Ohio State University 2 The Ohio State University
Corresponding Author: [email protected]
The transverse momentum distribution of the Higgs atlarge PT is complicated by its dependence on three important energy scales: PT , the top quark mass mt, and the Higgs mass mH . A strategy for simplifying the calculation of the cross section at large PT is to calculate only the leading terms 2 2 2 2 in its expansion in mt /PT and/or mH /PT . The expansion of the cross section in inverse powers of PT is complicated by logarithms of PT and by mass singularities. In this work, we consider the top-quark-loop contribution to the subprocess qq¯ → H + g at leading order in αs, which proceeds 2 through a top quark loop. We show that the leading power of 1/PT can be expressed in the form of a factorization formula that separates the large scale PT from the scale of the masses. All the dependence on mt and mH can be factorized into fragmentation amplitudes for tt¯ → H and for tt¯ → g and an endpoint contribution. This factorization approach will be useful for calculating the PT distribution at large PT to next-to-leading order in αs.
Poster Session and Reception / 343
Full TPC Signal and Noise Simulation
Author: Brooke Russell1
1 Yale University
Corresponding Author: [email protected]
MicroBooNE is an 89-ton Liquid Argon Time Projection Chamber (LArTPC) and the first of a trio of LArTPCs in the Short Baseline Neutrino (SBN) program which will search for a light sterile neu- trino and measure neutrino-argon interaction cross sections. Located in the Booster neutrino beam at Fermi National Accelerator Laboratory, MicroBooNE has taken neutrino data since October 2015. This poster outlines the intricacies of a full TPC noise and signal simulation. More specifically, this poster will detail the noise simulation based on measurement in the data and summarize the ram- ifications of induced current from nearest neighboring wires and other effects unique toLArTPC technology. The implementation of the full TPC signal and noise simulation is crucial tounder- standing the detector response for this technology.
Dark Matter / 344
The SENSEI project
Author: Javier Tiffenberg1
1 Fermilab
Corresponding Author: [email protected]
We present the status and prospects of the Sub-Electron Noise Skipper Experimental Instrument (SENSEI) currently operating in the MINOS cavern at Fermilab. SENSEI uses a non-destructive read- out technique to achieve stable readout for a thick fully depleted silicon CCD in the far sub-electron regime (∼ 0.05 e- rms/pix). This is the first instrument to achieve discrete sub-electron counting re- producibly over millions of pixels on a stable, large-area detector. This innovative technology has nearly immediate implications for a wide range of scientific disciplines including Dark Matter Direct detection experiments, astronomy and fundamental particle physics.
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Dark Matter / 345
The DAMIC Experiment at SNOLAB
Authors: Alvaro Chavarria1; Javier Tiffenberg2; Juan Estrada3; Paolo Privitera4
1 Kavli Institute for Cosmological Physics 2 Fermilab 3 FNAL 4 University of Chicago
Corresponding Authors: [email protected], [email protected]
Millimeter-thick charge-coupled devices (CCDs) are outstanding particle detectors. Although ini- tially developed for near-infrared astronomy, the low pixel noise also makes them the most sensi- tive detectors to signals from ionizing radiation. By virtue of their very low energy threshold (<100 eV of ionizing energy) and their unique capabilities for background characterization based on their high spatial resolution, CCDs are poised to become the leading technology in the search for a wide variety of dark matter candidates with masses in the range 1 eV/c/c – 10 GeV/c/c. I will presentthe status of the DAMIC100 experiment, an ongoing direct dark matter search consisting of an array of 16-Mpixel CCDs hosted in the low-radioactivity environment of the SNOLAB underground labora- tory. I will also discuss the recent progress toward DAMIC-1K, a lower-background 1-kg CCD dark matter detector with an ionization threshold of 2 electrons.
Poster Session and Reception / 346
Studies of Radiation Damage to Silicon Photomultipliers
Author: Sergey Uzunyan1
1 Northern Illinois University, for the Mu2e Cosmic Ray Veto Group
Corresponding Author: [email protected]
We present results of radiation tests of 1.3×1.3 mmˆ2 and 2.0×2.0 mmˆ2 for Hamamatsu silicon photo-multiplier (SiPM) sensors. These studies were per- formed to evaluate the suitability of the Hamamatsu devices for use in the Mu2e Cosmic Ray Veto. Distinct sets of eight SiPMs were exposed to four different 1 MeV neutron equivalent doses of200 MeV protons. Measurements of the breakdown voltage, gain and noise rates at different bias overvoltages, photoelectron thresholds, and LED illumination levels were taken before and after irradiation.
Particle Detectors / 347
Characterizing LArTPC detector performance with MicroBooNE
Author: JYOTI JOSHI1
1 Brookhaven National Laboratory
Corresponding Author: [email protected]
Page 122 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
With many current and future neutrino experiments relying on Liquid Argon Time Projection Cham- ber (LArTPC) technology, characterizing the performance of these detectors is critical. The Micro- BooNE LArTPC experiment is capable of performing numerous measurements to better understand the technology. These include identification and filtering of excess TPC noise, signal calibration and measurements of diffusion and recombination. MicroBooNE, residing on the surface, canalso provide useful information about cosmic ray rate and the build up of space charge in the TPC vol- ume. A laser calibration system has been designed and employed to investigate these important effects.
Poster Session and Reception / 348
Drifted Charge Extraction in Single Phase LArTPCs
Author: JYOTI JOSHI1
1 Brookhaven National Laboratory
Corresponding Author: [email protected]
The MicroBooNE detector is the first to be built in the short-baseline neutrino program. Itisasingle- phase LArTPC built to observe interactions of neutrinos from the on-axis Booster and off-axis NuMI beams at the Fermi National Accelerator Laboratory in Batavia, IL. We describe the concept and procedure of LArTPC drifted-charge extraction which converts the raw digitized TPC waveform to the number of ionized electrons passing through the wire plane at a given time. The proper recovery of the number of ionized electrons from both induction and collection anode wire planes is important to the success of the subsequent reconstruction algorithms. In this poster, we will show the details of the procedure including the key steps of 2D deconvolution and region-of-interest finding.
Dark Matter / 350
Emission of Photons and Relativistic Axions from Axion Stars
Authors: Abhishek Mohapatra1; Eric Braaten2; Hong Zhang1
1 The Ohio State University 2 Ohio State University
Corresponding Author: [email protected]
The number of nonrelativistic axions can be changed by inelastic reactions that produce relativistic axions or photons. Any even number of nonrelativistic axions can scatter inelastically into two relativistic axions. Any odd number of axions can annihilate into two photons. This reaction produces a monochromatic radio-frequency signal at an odd-integer harmonic ofthe fundamental frequency set by the axion mass.The loss rates of axions from axion stars through these inelastic relations are calculated using the framework of a nonrelativistic effective field theory. Odd- integer harmonics of a fundamental radio-frequency signal provide a unique signature for collapsing axion stars or any dense configuration of axions.
Poster Session and Reception / 352
Liquid argon test of the ARAPUCA device at the National Labo- ratory of Synchrotron Light in Campinas (São Paulo)
Page 123 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Authors: Ana Amelia Machado1; Anderson Fauth1; Bruno Gelli1; Camili Ambrosio2; Douglas Galante2; Ettore Segreto1; Franciole Marinho3; Gabriel Marques1; Laura Paulucci4; Marina Guzzo1; Renato Máximo1; Verônica Teixeira2
1 UNICAMP 2 National Laboratory of Synchrotron Light 3 UFSCAR 4 University of ABC
Corresponding Author: [email protected]
The ARAPUCA is a new concept for liquid argon scintillation detection, particularly suited forlarge liquid argon time projection chambers. It is constituted by a combination of a passive light collector and photo-sensitive silicon devices, which will allow to improve the detection efficiency of actual devices by an order of magnitude. The basic idea is to trap photons inside a box whose internal surface has an extremely high reflectivity and which is observed by silicon devices (SiPM), sothat the detection efficiency is high even with a small active coverage of the internal surfaces. Thepho- ton trapping is obtained with a smart combination of a short-pass dichroic filter and two different wavelength shifters, one of each side of the filter, which represents the acceptance window ofthe ARAPUCA. We will report of the first liquid argon test of the device in Brazil - at the National Laboratory of Synchrotron Light in Campinas (Sao Paulo) - which, to our knowledge, is the first liquid argon experiment in Latin America ever done up to now. The device was exposed to an alpha source of known energy so that it was possible to estimate its detection efficiency. The results were excellent and in perfect agreement with Monte Carlo predictions.
Poster Session and Reception / 353
Pion Production Measurements at MINERvA
Author: Gonzalo Diaz1
1 Rochester University
The MINERvA collaboration has performed important measurements on pion reactions off a scintilla- tor (CH) target, using the NuMI beam at Fermilab in both neutrino and anti-neutrino configurations. These reactions, used by generators to improve nuclear models, are essential for a better understand- ing of neutrino oscillation experiment results. An important fraction of the signal and background systematic uncertainties in this experiments come from the misidentification of these reactions. The current NOvA era, with a more energetic and intense NuMI beam, allows MINERvA toperform a more extensive exploration of these neutrino reactions, with more exciting results coming.
Cosmology and Astrophysics / 354
Recent progress from the SPT-3G experiment
Author: Amy Bender1
1 Argonne National Laboratory
Corresponding Author: [email protected]
The South Pole Telescope is a millimeter-wavelength telescope dedicated to observations oftheCos- mic Microwave Background (CMB). In late 2016, the telescope was upgraded with new receiver known as SPT-3G. The SPT-3G receiver contains a focal plane of approximately 16,000 polarization- sensitive superconducting detectors distributed between three frequency bands. SPT-3G will survey
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the sky for four years, resulting in extremely deep, high-resolution maps of the polarization of the CMB. With these data, SPT-3G has the potential to constrain inflationary gravitational waves as well as the effect of massive neutrinos on large-scale structure formation. I will describe some ofthetech- nological advances enabling the large-format SPT-3G focal plane as well as the current instrument status and cosmological forecasts.
Neutrino Physics / 355
Reducing neutrino cross-section uncertainties with the NuPRISM experiment
Author: Cristovao Vilela1
1 Stony Brook University
Corresponding Author: [email protected]
NuPRISM is a proposed 1 kton water Cherenkov detector in the J-PARC neutrino beam, placed at a distance of around 1 km from the neutrino production point. The detector configuration allows for vertical movement over around 50 meters resulting in a wide span of angles with respect to the beam direction. Data taken at different off-axis angles is sampled from neutrino fluxes peakingat different energies, linear combinations of which can be used to predict the lepton kinematics foran oscillated neutrino flux at Super-Kamiokande with a significantly reduced dependence on neutrino cross-section models. Such measurements will allow for precision measurements of neutrino oscil- lation parameters with the T2K experiment and future long-baseline neutrino experiments. Among the R&D activities for the project, a multi-PMT configuration has the detector populated with modules comprising several 3″ PMTs, equipped with reflectors, and integrated electronics. An initial phase of the experiment consists of a surface detector at the J-PARC site, in an extreme off-axis configuration. This phase will demonstrate the stringent requirements on the controlde- tector systematic uncertainties, and will produce a precise measurement of the electron neutrino cross-section on water. An overview of the project will be presented, as well as an update on detector optimization studies currently underway.
Cosmology and Astrophysics / 356
Searching for Dwarf Galaxies with DECam
Author: Alex Drlica-Wagner1
1 Fermilab
Corresponding Author: [email protected]
Milky Way satellite dwarf galaxies are some of the oldest, smallest, and most dark matter dominated galaxies in the known universe. The study of these tiny dwarf galaxies can help shed light onthe nature of dark matter and the mysteries of galaxy formation. Over the last two years, efforts using the Dark Energy Camera (DECam) have nearly doubled the known population of Milky Way satellite galaxies. However, to date, only a fraction of the southern sky has been uniformly imaged by DECam. I will present results from two new surveys, the Magellanic Satellites Survey (MagLiteS) and the Blanco Imaging of the Southern Sky (BLISS) survey, which are using DECam to image the southern sky at unprecedented depths.
Dark Matter / 357
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Explaining Diverse Rotation Curves of Spiral Galaxies with Self- Interacting Dark Matter
Authors: HAI-BO YU1; Manoj Kaplinghat2; Tao Ren3
1 UNIVERSITY OF CALIFORNIA, RIVERSIDE 2 University of California, Irvine 3 UC Riverside
Corresponding Author: [email protected]
Self-interacting dark matter (SIDM) is a simple and well motivated scenario that demonstrates great potential to solve small scale issues. One recent example is the diversity problem due to the failure of the lambda cold dark matter (LambdaCDM) paradigm to explain the diverse behavior in observed rotation curves, especially for dwarf galaxies. To address this issue in SIDM paradigm, we follow our previous work and fit 120 galaxy velocity rotation curves from SPARC dataset using SIDM model with a fixed value of self-interaction cross section and only assuming the halo concentration-mass relation predicted by the LambdaCDM model. Our result shows SIDM dramatically improves the ability to fit the rotation curve comparing to CDM. Discrepancy in halo masses corresponding tothe same disk mass between result from fitting and expectation from abundance matching may indicate the “too-big-to-fail” problem still exist with current SIDM. Radial acceleration relation and baryonic Tully-Fisher relation are closely reproduced though with a bit large reasonable scatter. In addition, SIDM direct detection will be briefly discussed.
Neutrino Physics / 358
Solar and Supernova Neutrinos in Super-Kamiokande
Author: Scott Locke1
1 University of California, Irvine
Corresponding Author: [email protected]
Super-Kamiokande (SK), the world’s largest water Cherenkov detector has collected over 320 kt- years of solar neutrino data. It has observed ˜90k Boron-8 solar neutrinos by using neutrino-electron elastic scattering. SK searches for distortions of the solar neutrino energy spectrum caused bymatter effects within the core of the Sun. SK also searches for earth matter effects, resulting inaday/night asymmetry of the SK interaction rate. Currently SK has a threshold of 3.5 MeV kinetic energy of recoiling electrons. SK also monitors for galactic supernova neutrino bursts, giving early warning to astronomers. A supernova 8.5 kpc away has 300 expected elastic scattering events, which SK would be able to use to indicate the supernova direction. With an expected 8000 inverse beta events, a precise study of burst time structure and anti-neutrino energy spectrum can be performed. SK also searches for the diffuse signal from distant supernova and has the world’s best upper limit.
Neutrino Physics / 359
Measurement of Reconstructed Charged Particle Multiplicities of Neutrino Interactions in MicroBooNE
Authors: Aleena Rafique1; Tim Bolton1
1 Kansas State University
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MicroBooNE is a liquid argon Time Projection Chamber experiment situated on the Booster Neu- trino Beam at Fermilab that is designed to probe neutrino interactions, investigate non-standard neutrino oscillations, and further develop the LArTPC detector technology. In this talk, we com- pare the observed charged particle multiplicity distribution, which is produced via neutrino charged current interactions in the visible phase-space to predictions of this distribution from current gen- erator models. The data used in this analysis were collected in 2015-2016 by MicroBooNE detector. The analysis employs a fully automatic event selection and charged particle track reconstruction and uses a novel data-driven technique to separate neutrino interactions from cosmic-induced back- grounds.
Beyond Standard Model / 360
Imposing LHC constraints on the combined Anomaly and Z’-Mediation mechanism of Supersymmetry Breaking
Author: Joydeep Roy1 Co-author: Gil Paz 2
1 Wayne state University 2 Wayne State University
Corresponding Author: [email protected]
Combining anomaly with Z’ mediation of SUSY breaking allows us to solve the tachyonic problem of the former and avoid fine tuning in the latter. This scenario includes an extra U(1)’ gauge symmetry and extra singlet scalar S which provides a solution to the ‘µ problem’ of the MSSM. The low-energy particle spectrum is calculated from the UV inputs using the Renormalization Group Equations. The benchmark points considered in the original model, suggested before the Higgs discovery, predicted a Higgs mass close to the current measured value of 125 GeV. We use the current LHC data to update the predictions of the model, its particle spectrum and in particular the mass of the Z’ gauge boson.
Cosmology and Astrophysics / 361
Cosmology from CMB Polarization with POLARBEAR and the Simons Array
Author: Darcy Barron1
1 UC Berkeley / LBNL
Corresponding Author: [email protected]
POLARBEAR is a cosmic microwave background (CMB) polarization experiment located in the Ata- cama desert in Chile. The science goals of the POLARBEAR project are to do a deep search forCMB B-mode polarization created by inflationary gravitational waves, as well as characterize theCMB B-mode signal from gravitational lensing. Gravitational lensing of large-scale structure creates B-mode polarization on arcminute scales, and surveys of this signal can be used to constrain the sum of the neutrino masses. POLARBEAR-1 started observations in 2012, and the POLARBEAR team has published a series of results from its first season of observations, including the first measurement of a non-zero B-mode polarization angular power spectrum. Recently, we released an improved measurement of the B- mode polarization power spectrum, reducing our uncertainties by a factor of two, by adding new data from our second observing season and re-analyzing the combined data set. To further improve on these measurements, POLARBEAR is expanding to include an additional
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two telescopes with dichroic receivers covering 95, 150, 220, and 270 GHz, known as POLARBEAR- 2/Simons Array. With high sensitivity and large sky coverage, the Simons Array will create a de- tailed survey of B-mode polarization, and its spectral information will be used to extract the CMB signal from astrophysical foregrounds. We will present the latest POLARBEAR results, as well as the status of development of the Simons Array and its expected capabilities.
Neutrino Physics / 362
CAPTAIN: Current Neutron and Future Stopped Pion Neutrino Measurements
Author: Neha Dokania1
1 Stony Brook University
Corresponding Author: [email protected]
All neutrino oscillation experiments face the problem of reconstructing the incoming neutrino energy using only the visible interaction products. Unfortunately, the initial neutrino interaction is not well understood, and some of the interaction products not are visible. In preparation for the analysis of neutrino oscillation data collected using liquid argon time projection chambers, the Cryogenic Apparatus for Precision Tests of Argon Interactions with Neutrinos (CAPTAIN) program makes crucial measurements addressing these problems in two distinct phases. The first uses Mini-CAPTAIN to measure the cross section of neutrons impinging on an argon target with a kinetic energy of more than 50 MeV. This measurement will help determine the signature of neutrino generated neutrons in a LArTPC. Mini-CAPTAIN, a LArTPC with 400 kg of instrumented mass, is currently deployed in a neutron beamline at the Los Alamos Neutron Science Center (LANSCE) at Los Alamos National Laboratory (LANL). The LANSCE beam provides a well-known flux of neutrons up to a kinetic energy of800 MeV. The total cross section will be measured as a function of neutron kinetic energy, and partial cross sections for n + Ar → p + X and n + Ar → π± + X will be measured above the threshold for the produced protons and pions. I will report results from a February 2016 engineering run during which Mini-CAPTAIN collected neutron data with a photon-detection system, discuss the upcoming neutron run and their implications for the long-baseline oscillation analysis at DUNE. Finally, I will discuss a future deployment of CAPTAIN, a LArTPC with 5 tons of instrumented mass, at a stopped-pion neutrino source and the implications of the measurements for the future DUNE supernova physics program.
Beyond Standard Model / 363
Revisiting Dyons in Particle Physics
Author: John Cumalat1
1 University of Colorado
Corresponding Authors: [email protected], [email protected]
Revisiting Dyons in Particle Physics Schwinger’s dyon is a bound system of a magnetic monopole and an electric charge. Suppose a monopole (B=g/r2) is a distance zo above an electric charge (E= q/r2). Then (in gaussian units) this system stores an angular momentum about the z-axis of L = qg/8πc regardless of the magnitude of zo. Schwinger proposed that all hadronic matter is composed of dyons: the mesons are adyon and an anti-dyon, the baryons are three dyons. Dyons can lead to all three of the familiar forces in the Standard Model (Science Magazine , 1969). As proposed by Schwinger, the dyon complemented
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quarks: the smallest charge |qo|=(1/3)e. The smallest magnetic charge go is the Dirac monopole go=(137/2)qo. Quantized magnetic charge g substitutes for the now usual color. All hadronsare colorless. In a subsequent publication, Schwinger explicitly excluded the integrally-charged Han- Nambu quarks and, rightfully, claimed credit for the prediction of the mass of the J/ψ (Science, 1975). Two Colorado professors, Kalyana Mahanthappa and Asim Barut were keen participants in the dis- cussion of dyons. Barut believed that all hadronic matter is made of integrally charged dyons. Thus “dyonium”. Mahanthappa worried about the axis implicit in the dyon. This axis makes the topology of the dyon two-dimensional. He argued that at least one dyon must disobey the usual connection between spin and statistics. We believe that both may have been right. Han-Nambu quarks are not caught by the very sensitive oil-drop experiment of Perl, Lee, and Loomba (2004). The parity of the b-“quark” is still not determined except in the context of the Standard Model (PDG-2016). It may not be a pseudoscalar. Schwinger had a novel treatment of the Cabibbo angle and predicted the mass of the W to be 53 GeV in an era when the only leptons were the muon and the electron. Perl’s discovery of the third lepton, the tau, came too late for physicists to appreciate that 80 GeV is 3/2 of 53 GeV. Recent data from LHCb hints that, in distinction to the KL, the B decays to an electron and an anti electron more often than it decays to a muon and an antimuon. Lifetime vs Mass data from the summary tablesof PDG-2016 suggest regularities which Schwinger anticipated long ago. It might be useful to review whether the dyon model can really be excluded
Accelerators / 364
Accelerator Driven Subcritical Reactors for Weapons-Grade Plu- tonium Disposition and Energy Generation
Authors: Mary Anne Cummings1; Rolland Johnson1
Co-authors: Robert Abrams 1; Thomas Roberts 1
1 Muons, Inc.
Corresponding Authors: [email protected], [email protected]
We discuss the GEMSTAR reactor concept, which addresses all historical reactor failures, which includes an internal spallation neutron target and high temperature molten salt fuel with continuous purging of volatile radioactive fission products such that the reactor contains less than a critical massandal- most a million times fewer volatile radioactive fission products than conventional reactors like those at Fukushima. GEMSTAR is a reactor that without redesign will burn spent nuclear fuel, natural uranium, thorium, or surplus weapons material. It will operate without the need for a critical core, fuel enrichment, or reprocessing making it an excellent candidate for export. While conventional nuclear reactors are becoming more and more difficult to license and expensive to build, SRF tech- nology development is on a steep learning curve and the simplicity implied by subcritical operation will lead to reductions in regulatory hurdles and construction complexity.
Poster Session and Reception / 365
MuSim, a Graphical User Interface for Multiple Simulation Codes
Author: Thomas Roberts1
Co-authors: Mary Anne Cummings 1; Robert Abrams 1
1 Muons, Inc.
Corresponding Author: [email protected]
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MuSim is a user-friendly program designed to interface to many different particle simulation codes, regardless of their data formats or geometry descriptions. It presents the user with a compelling graphical user interface that includes a flexible 3-D view of the simulated world plus powerful editing and drag-and-drop capabilities. All aspects of the design can be parameterized so that parameter scans and optimizations are easy. It is simple to create plots and display events in the 3-D viewer, allowing for an effortless comparison of different simulation codes. Simulation codes: G4beamline 3.02, MCNP 6.1, and MAD-X; more are coming. Many accelerator design tools and beam optics codes were written long ago, with primitive user interfaces by today’s standards. MuSim is specifically designed to make it easy to interface to such codes, providing a common user experience for all, and permitting the construction and exploration of models with very little overhead. For today’s technology-driven students, graphical interfaces meet their expectations far better than text-based tools, and education in accelerator physics is one of our primary goals.
Accelerators / 366
Muon Cooling Innovations and the Future of Bright Muon Beams
Authors: Mary Anne Cummings1; Rolland Johnson1
Co-authors: Robert Abrams 1; Tom Roberts 1
1 Muons, Inc.
Corresponding Author: [email protected]
Muon-based accelerators have the potential to enable facilities at both the Intensity and the Energy Frontiers, with industrial applications as well. Progress in muon accelerator designs has advanced steadily in recent years. In regard to 6D muon cooling, detailed and realistic designs now exist that provide more than 5 order-of-magnitude emittance reduction, with recent progress in “supercooling” techniques offering at least another order of magnitude. Furthermore, detector performance studies indicate that with suitable pixelation and timing resolution, backgrounds in the collider detectors can be significantly reduced thus enabling high quality physics results. Thanks to these andother advances in design and simulation of muon systems, technology development, and systems demon- strations, muon storage-ring-based neutrino sources and a muon collider appear more feasible than ever before. A muon collider is now arguably among the most compelling approaches to a multi-TeV lepton collider and an S-Channel Higgs Channel.
Cosmology and Astrophysics / 367
Constraining the Nature of Dark Matter with the Milky Way Satel- lite Galaxies
Author: Ting Li1
1 Fermilab
Corresponding Author: [email protected]
The census of Milky Way satellite galaxies provides crucial tests of both galaxy formation modelsand the broader Cold Dark Matter paradigm. A total of 27 new Milky Way satellite candidates havebeen discovered in the last two years, primarily in data from the Dark Energy Survey. These discoveries may represent a 100% increase in the number of known Milky Way satellite galaxies, leading a huge advance in solving the missing satellite problem, if spectroscopic follow-up observations confirm the majority of these systems are dark matter dominated dwarf galaxies. Furthermore, many of these newly discovered dwarf galaxies are excellent targets for providing constraints on WIMP dark matter cross section and MACHO dark matter abundance with the spectroscopic follow-up analysis.
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In this talk, I will present the initial results from a spectroscopic campaign on the newly discovered dwarf galaxy candidates using 4-8 meter class telescopes in the southern hemisphere.
Cosmology and Astrophysics / 368
The ACTPol and Advanced ACTPol Experiments
Author: Jeff McMahon1
1 University of Michigan
Corresponding Author: [email protected]
ACTPol and Advanced ACTPol are a series of cameras deployed on the Atacama Cosmology Tele- scope (ACT) and used to map the temperature and polarization of the cosmic microwave background (CMB) in multiple frequency bands and with arc minute resolution. Survey operations began in 2013 with a sky coverage of hundreds of square degrees in the 150 GHz band. Over the past five years we have upgraded the instrument and expanded the sky coverage. Beginning in 2016 we have been undertaking a wide survey covering 14,000 square degrees with sensitivity in the 90, 150, and 220 GHz bands. These data have been used to make measurements of CMB polarization, CMB lensing, and cross-correlations between these maps and observations at other wavelengths. In this presentation I given an overview of these experiments, our published results to date, and provide a preview of the science which will come out of the Advanced ACTPol data set for which analysis is ongoing.
Dark Matter / 369
The SuperCDMS Soudan High Mass Analysis
Author: Brett Cornell1
1 Caltech
Corresponding Author: [email protected]
The SuperCDMS Soudan experiment searches for direct interactions of WIMP dark matter particles with germanium nuclei. The experiment uses detectors (iZIPs) with sophisticated ionization and phonon sensors to distinguish nuclear-recoils from electron-recoil backgrounds or surface contami- nants. We report the result of an analysis, based on a ∼1700 kg-day exposure, that seeks to maximize our experimental sensitivity to spin-independent WIMP-nucleon interaction in the high mass regime (M > 10 GeV/cˆ2).
Diversity, Education, and Outreach / 370
Brookhaven Women in Science - Promoting Women, Advancing Science
Author: JYOTI JOSHI1
1 Brookhaven National Laboratory
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Corresponding Author: [email protected]
Brookhaven National Laboratory’s Brookhaven Women in Science (BWIS) is a not-for-profit organi- zation with aim to promote the advancement of women. It’s mission is to increase the Laboratory’s awareness of the accomplishments of women in science and to provide members with role models of their own. BWIS assist in the development of policies and practices that enhance the quality of life for BNL employees. It also helps promoting a long-term commitment to diversity in BNL staff, advancement of women in scientific and technical careers by providing a forum for the exchange of scientific, technical, and professional information and encourage students to consider careersin science, mathematics, engineering, and technology. This talk will discuss the goals, activities and accomplishments of BWIS.
Quark and Lepton Flavor / 371
Beauty-full Tetraquarks
Author: Yang Bai1
Co-authors: James Osborne 1; Sida Lu 1
1 University of Wisconsin-Madison
Corresponding Author: [email protected]
Non-relativistic two-body heavy quark system has been proved to be very useful to understand the QCD dynamics. Extending it to many-body heavy quark system may not just provide a new and interesting tetraquark state, but also helps us to understand QCD more. In this talk, I will discuss a way to calculate the ground-state energy of a tetraquark of four beauty quarks, which can behave as a Y(1S)Y*(1S) resonance.
Dark Matter / 372
Supersymmetric Resonant Dark Matter: an Explanation to AMS- 02 Positron Excess
Author: Yang Bai1
Co-authors: Joshua Berger 1; Sida Lu 1
1 University of Wisconsin-Madison
Corresponding Authors: [email protected], [email protected]
We construct a thermal dark matter model with the dark matter annihilations mediated by areso- nance to explain the positron excess observed by PAMELA, Fermi-LAT and AMS-02 and to satisfy other experimental constraints. Based on a spontaneous breaking global symmetry of SU(3)/SU(2)xU(1), we provide a natural explanation for why the resonance mass is very close to twice of the dark matter mass. The pseudo Nambu Goldstone Bosons in the coset space, with a mass below one GeV,mainly decay into two muons and provide a good fit to the positron excess spectrum. I will also discuss other dark matter phenomenology of our model.
Quark and Lepton Flavor / 373
Page 132 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Recent Results on Radiative and Electroweak Penguin B decays at Belle
Author: Saurabh Sandilya1
1 University of Cincinnati
Corresponding Author: [email protected]
Flavor changing neutral current (FCNC) B decays are forbidden at tree level in the Standard Model (SM) and proceed at lowest order through penguin loop and box diagrams. These types of rare B decays are sensitive to contributions from non-SM particles which can enter into the loop diagram. The Belle detector has recorded world’s largest e+e- collision dataset at the Y(4S) resonance, contain- ing 772 million BB-bar pairs. This talk will report the recent results from the Belle Experiment on the radiative penguin B meson decay with b->(s,d) gamma transitions, and electroweak penguin B meson decays with b->sll, and b->(s,d) nu nu transition and will discuss their impact on the New Physics.
Particle Detectors / 374
Design and status of the Mu2e crystal calorimeter
Author: Rafaella Donghia1
1 INFN Frascati, Università degli Studi Roma Tre
Corresponding Author: [email protected]
The Mu2e experiment at Fermilab searches for the charged-lepton flavour violating neutrino-less conversion of a negative muon intoan electron in the field of an aluminum nucleus [1]. The Mu2e detector is composed of a tracker and an electromagnetic calorimeter and an external veto for cosmic rays. The calorimeter plays an important role in providing excellent particle identification capabilities, a fast online trigger filter while aiding the track reconstruction capabilities. The calorimeter requirements are to provide a large acceptance for 100 MeV electrons and reach: (a) a time resolution better than 0.5 ns @ 100 MeV; (b) an energy resolution O(10%) @100 MeV and (c) a position resolution of 1 cm. The calorimeter consists of two disks, each one made of 674 pure CsI crystals readout by two large area array 2×3 of UV-extended SiPM 6×6 mm2. We report here all progresses done for the construction and test of the latest large scale prototype that consists of an array of 51 pre-production crystals Each crystal has been readout by two pre-production Mu2e SiPMs. The prototype will be exposed to an electron beam in the energy range around 100 MeV at the Beam Test Facility in Frascati (Italy). Preliminary results of timing and energy resolution will be shown. References [1] Mu2e Collaboration, Mu2e Technical Design Report, http://arxiv.org/abs/1501.05241, 2015
Particle Detectors / 375
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Quality Assurance on Un-Doped CsI Crystals for the Mu2e Exper- iment
Author: Tomonari Miyashita1
1 California Institute of Technology
Corresponding Author: [email protected]
The Mu2e experiment is constructing a calorimeter consisting of1,348 un-doped CsI crystals in two disks. Each crystal has a dimension of 34x34x200 mm3, and is readout by a large area SiPM array. A series of technical specifications on mechanical and optical parameters was defined according to the calorimeter physics requirements. Pre-production CsI crystals were procured from three firms: Amcrys, St. Gobain and SICCAS. We report the quality assurance on crystal’s scintillation properties and their radiation hardness against ionization dose and neutrons. The results confirm that the quality of mass produced un-doped CsI crystals in the market satisfies the Mu2e requirements.
Poster Session and Reception / 376
Pre-production and quality assurance of the Mu2e Silicon Photo- multipliers
Author: Bertrand Echenard1
1 Caltech
Corresponding Author: [email protected]
The Mu2e calorimeter is composed by two disks of 1348 un-doped parallelepiped CsI crystals of 34x34x200 mmˆ3 dimension, each one readout by two large area SiPM arrays. We translated the calorimeter requirements in a series of technical specifications for the SiPMs that are summarized by the following list: - high gain, above 10ˆ6, for each monolithic (6x6) mmˆ2 SiPM cell; - good photon detection efficiency, PDE, of above 20% at 310 nm to well match the light emittedby the un-doped CsI crystals; - large active area that, in combination with the PDE, could provide a light yield of above 20 p.e./MeV; - fast rise time and a narrow signal width to improve time resolution and pileup rejection; - Mean to Time Failure (MTTF) of O(106) hours; - good resilience to neutrons for a total fluency up to 10ˆ12 n(1 MeV-eq)/cmˆ2. A modular and custom SiPM layout has been chosen to satisfy these requirements. A pre-production of 150 Mu2e SiPMs has been procured by three international firms (Hamamatsu, Sensl and Advansid). A detailed quality assurance, QA, has been carried out on each SiPM. A summary of the techniques used and of the QA characterization of the sensors will be shown.
Neutrino Physics / 377
Sterile Neutrino Searches with NOvA
Page 134 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Author: Gavin S. Davies1
1 Indiana University
Corresponding Author: [email protected]
The existence of light sterile neutrinos would have profound implications forboth particle physics and cosmology. The NOvA (NuMI Off-Axis ve Appearance) experiment is sensitive to new neutrino flavors through searches for the disappearance of the known active neutrinos from the NuMI beam over a baseline of 810 km. We describe the method used by NOvA to look for oscillations into sterile neutrinos, with a focus on the disappearance of neutral-current (NC) neutrino events. We present the results from the first NC Disappearance analysis using 6.05E20 POT of neutrino data, and discuss the status and outlook for ongoing and future sterile neutrino searches with NOvA, at both long and short baselines.
Poster Session and Reception / 378
NuMI Target and Horn Studies for NOvA
Author: Jyoti Tripathi1
1 Panjab University
Corresponding Author: [email protected]
The NuMI Off-axis νe Appearance (NOvA) experiment is a long baseline neutrino oscillation experiment designed to measure both νe appearance and νµ disappearance. The Neutrinos at the Main Injector (NuMI) facility produces an intense muon neutrino beam by directing 120 GeV protons onto a 2.5 interaction length graphite target segmented into 48 fins. The secondary particles produced at the target are focused by two magnetic horns and followed by a long decay pipe where most of the short-lived particles (pions and kaons) decay to neutrinos.The NOvA detectors are placed 14.6 mad off-axis to the NuMI beam. In this poster we present an update onthetarget and horn set configuration study for an optimized NOvA neutrino flux. We found that anewtarget design with 24 fins upstream and 24 fins extended inside of the first horn produces moreoff-axis neutrino flux than the existing NOvA target that has 48 fins upstream of the first horn.Weshow also our progress on optimizing the position of the second horn and the prospect to include a third horn (identical to the existing second horn) into the focusing system. Additional studies of material in the beam downstream of the horns are also under study.
Particle Detectors / 379
Detector performance and cosmic-ray reconstruction efficiency in MicroBooNE
Author: Stefano Roberto Soleti1
1 University of Oxford
Corresponding Author: [email protected]
The MicroBooNE detector is a liquid argon time projection chamber at Fermilab designed for short- baseline neutrino oscillation physics and neutrino-argon interaction cross-section measurements. Due to its location near the surface, a good understanding of cosmic muons as a source of back- grounds is of fundamental importance for the experiment. This talk will show recent results on MicroBooNE detector performance from our first 18 months of running and a method to determine the cosmic-ray reconstruction efficiency using an external cosmic-ray counter, installed above the
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main detector. The analysis represents a small-scale demonstration of the method that can be used with futuredata coming from a recently installed cosmic-ray tagger system, which is able to tag ≈ 80% of the cosmic rays passing through the MicroBooNE detector.
Computing, Analysis Tools, and Data Handling / 380
Automated proton track identification in MicroBooNE using gra- dient boosted decision trees
Author: Katherine Woodruff1
1 New Mexico State University
Corresponding Author: [email protected]
MicroBooNE is a liquid argon time projection chamber (LArTPC) neutrino experiment that is currently running in the Booster Neutrino Beam at Fermilab. LArTPC technol- ogy allows for high-resolution, three-dimensional representations of neutrino interactions. A wide variety of software tools for automated reconstruction and selection of particle tracks in LArTPCs are actively being developed. Short, isolated proton tracks, the signal for low-momentum-transfer neutral current (NC) elastic events, are easily hidden in a large cosmic background. Detecting these low-energy tracks will allow us to probe interesting regions of the proton’s spin structure. An effec- tive method for selecting NC elastic events is to combine a highly efficient track reconstruction algorithm to find all candidate tracks with highly accurate particle identification us- ing a machine learning algorithm. We present our work on particle track classification using gradient tree boosting software (XGBoost) and the performance on simulated neutrino data.
QCD / 381
NNLO QCD Predictions
Author: Xiaohui Liu1
1 Beijing Normal University
Corresponding Author: [email protected]
In this talk, I will review the current status of NNLO QCD predictions at the LHC
Poster Session and Reception / 382
Data Acquisition and Triggering for the KOTO Experiment
Author: Melissa Hutcheson1
1 University of Michigan
Corresponding Author: [email protected]
The KOTO experiment at the J-PARC research facility in Tokai-mura, Japan aims to observe and measure the rare decay of the neutral kaon, KL → π0νν¯, in which a neutral kaon decays to a neutral pion and a neutrino antineutrino pair. This decay has a Standard Model predicted branching
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ratio of (3.00 ± 0.30) x 10ˆ−11. While this decay is extremely rare, it is one of the best decays for studying charge-parity (CP) violation in the quark sector. Because the signal decay has such a low branching ratio, the data acquisition (DAQ) system for the KOTO experiment uses three levels of trigger cuts to selectively record events of interest and discard background events. The KOTO DAQ system is designed to have a highly optimized signal acceptance and background rejection due to the high trigger rate. This poster will focus on these details and how the triggers and DAQsystem address the physics requirements of the detectors.
Higgs and EWSB / 383
Enhanced tth¯ and Di-Higgs production rates in the Two Higgs Doublet Model
Author: K.S. Babu1 Co-author: SUDIP JANA 2
1 Oklahoma State University 2 OKLAHOMA STATE UNIVERSITY
Corresponding Author: [email protected]
In the two Higgs doublet extension of the Standard Model, where both Higgs doublets couple to fermions, the production rates for tth¯ and Di-Higgs bosons can be significantly enhanced, consis- tent with flavor violation constraints and with the known properties of the 125 GeV Higgs boson h. Results of our study leading to this correlated enhancements will be presented. Signal strength for tth¯ can be enhanced by as much as a factor of three, while that for di-Higgs production may be enhanced by a factor of thirty, compared to the Standard Model expectations.
Dark Matter / 384
First Dark Matter Search Results from the XENON1T Experiment
Authors: Chris Tunnell1; Patrick de Perio2
1 University of Oxford 2 Columbia University
Corresponding Authors: [email protected], [email protected]
XENON1T is the current experiment of the XENON dark matter search program based on dual- phase (liquid-gas) xenon time projection chambers (TPCs) of increasing target mass and decreasing background. The experiment was constructed and assembled over the past 3 years at theINFN Laboratori Nazionali del Gran Sasso (LNGS). The XENON1T detector is the first multi-ton scale liquid xenon (LXe) TPC containing a total of 3200 kg of ultra-pure LXe of which 2000 kg are active. Commissioning of the LXe TPC and the surrounding muon veto water Cherenkov detector, as well as associated cryogenics and purification plants was completed during the fall of 2016. Ablind analysis of 1042 kg fiducial mass and 34.2 live days of data acquired between November 2016and January 2017 was performed. XENON1T continues to take data following a short break caused by the January 18, 2017 earthquake. The results from this first dark matter search and outlook forthe science program with XENON1T will be presented.
Poster Session and Reception / 385
Page 137 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Large Neutrino Mixing Angles in Minimal SO(10) Unification
Author: Shaikh Saad1 Co-authors: Borut Bajc 2; Ks Babu 3
1 Oklahoma State University 2 Jozef Stefan Institute 3 Oklahoma State
Corresponding Author: [email protected]
The possibility of generating small neutrino mass and large neutrino mixing angles, in thecontext of the most economic Yukawa sector of non-supersymmetric SO(10) unification is studied. In SO(10) grand unification, the mass matrices of the quarks and leptons are related and given intermsof the same fundamental Yukawa coupling matrices. This is why, it is highly challenging to repro- duce the small quark mixings and large neutrino mixings simultaneously. In this work, the minimal SO(10) grand unified theory consistent with these phenomenological requirements is constructed. Our study shows that, if SO(10) gauge symmetry is the only symmetry of the theory, then the Yukawa sector consists of a real 10, a real 120 and a complex 126 dimensional representations. This minimal setup demands the neutrino mass hierarchy to be normal ordering and predicts the two experimentally yet unmeasured quantities, the leptonic Dirac CP-violating phase and the lightest neutrino mass. Gauge coupling unification and proton decay are also analysed.
Particle Detectors / 386
A High Efficiency Cosmic Ray Veto Detector for the Mu2e Exper- iment at Fermilab
Author: E. Craig Dukes1
1 University of Virginia
Corresponding Author: [email protected]
The Mu2e experiment is designed to search for the charged-lepton flavor-violating process, μ−toa e−, with unprecedented sensitivity. The single 105-MeV electron that results from this process can be mimicked by cosmic-ray muons or their products entering the detector. An active veto detector surrounding the apparatus is used to detect incoming cosmic-ray muons. To reduce the backgrounds to the required level it must have an average efficiency of 99.99% and excellent hermeticity overa large area. The detector consists of four layers of scintillator counters, each with two embedded wavelength-shifting fibers, whose light is detected by silicon photomultipliers. The designandex- pected performance of the cosmic ray veto detector will be described.
Poster Session and Reception / 387
Cosmic Ray Backgrounds in the Mu2e Experiment at Fermilab
Author: Ralf Ehrlich1
1 University of Virginia
Corresponding Author: [email protected]
The Mu2e experiment will study charged lepton flavor violation by searching for the neutrinoless, coherent conversion of a − to an −. Such a process will result in an electron of 105 MeV energy.
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A major background source comes from cosmic-ray muons which can either be misidentified as signal electrons or produce 105 MeV electrons. Such events will occur at a rate of approximately one per day. An active veto detector surrounding the apparatus will be used to detect incoming cosmic-ray muons. Results will be shown from one of the most extensive simulation campaigns ever undertaken in which the cosmic-ray background from several times the entire running period was simulated: over 1012 generated cosmic-ray muons.
Computing, Analysis Tools, and Data Handling / 388
Studies of Beam Induced Radiation Backgrounds at the Mu2e Ex- periment and Implications for the Cosmic Ray Veto Detector Op- erations
Author: Yuri Oksuzian1
1 University of Virginia
Corresponding Author: [email protected]
The Mu2e experiment will search for a neutrinoless muon-to-electron conversion process usinga novel apparatus design that promised almost four orders of magnitude of sensitivity improvement to the current limit. An important background is caused by cosmic-ray muons faking the conversion electron signature. In order to reach the designed sensitivity, Mu2e needs to obtain a cosmic-ray veto (CRV) efficiency of 99.99%. The CRV consists of four layers of plastic scintillator which surrounds the detector with an area of approximately 300 m2. One of the challenges the CRV faces is the large neutron and gamma fluxes produced from beam interactions present in the apparatus. This radiation can damage the detector components and generate large background rates in the CRV. Extensive studies have been made to optimize the shielding needed to mitigate these rates. We present results from sophisticated simulations of the rates and estimate the total deadtime produced by the radiation backgrounds in the CRV.
Particle Detectors / 389
Performance of Scintillation Counters with Silicon Photomulti- plier Readout
Author: Ralf Ehrlich1
1 University of Virginia
Corresponding Author: [email protected]
The performance of scintillator counters with embedded wavelength-shifting fibers and readout using silicon photomultipliers (SiPMs) have been measured in the Fermilab Meson Test Beam Facility using 120 GeV protons. The counters were extruded with a titanium dioxide surface coating andtwo channels for the fibers at the Fermilab NICADD facility. The signals were amplified and digitized by a custom-made front-end electronics board. We report on the photoelectron yield from: (1) four different extrusion/coating mixtures; (2) extrusions with 5×2 cm2 and 6×2 cm2 profiles; (3) 1.0,1.4 and 1.8 mm diameter fibers; (4) 2×2mm2 and 3×3 mm3 SiPMs; (5) transverse and longitudinal scans; (6) different reflectors at the counter far end; and (7) different SiPM biases. The position resolution obtained from timing differences from the SiPMs at both ends of the 3-m-long counters willalso be presented. The counters are intended to be used in the cosmic-ray veto detector for theMu2e experiment at Fermilab.
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Beyond Standard Model / 390
A Neural Net Trigger for a Monopole Search with the NOvA Far Detector
Author: Enhao Song1
Co-author: E. Craig Dukes 1
1 University of Virginia
Corresponding Authors: [email protected], [email protected]
The NOνA experiment is studying a variety of neutrino properties using a long-baseline neutrino beam and near and far detectors. Due to its surface proximity and large area the NOνA far detector is particularly sensitive to a large range of magnetic monopole masses and energies. The monopole trigger, like all NOvA data-driven triggers, is software only using data collected and sent to afarm of on-site computers. The trigger must be fast, have a high efficiency, and a large rejection factorin order to reduce the background of over 150,000 cosmic rays that course through the detector every second to no more than 10 s-1. The present cut-based trigger has an efficiency uncertainty due to irreducible uncertainties in the expected monopole energy deposit in the detector. We discuss and show the performance of a novel neural net trigger with a much improved efficiency and lower uncertainties. Sensitivities for the monopole search using the previous trigger data and the improved trigger data will be given.
Poster Session and Reception / 391
Muon Tomography of Galeras Volcano: first results leaded by young scientists in Colombia
Authors: Alex Tapia1; David Martinez Caicedo2
Co-authors: Danilo Arturo 3; David Dueñas 3; Jaime Betancourt 3; Jairo Rodriguez 3
1 University of Medellin 2 Illinois Institute of Technology 3 University of Nariño
Corresponding Authors: [email protected], [email protected]
Muon radiography is based on the observation of the absorption of muons in matter, as the ordinary radiography does by using X-rays.The interaction of cosmic rays with the atmosphere produce Ex- tensive Air Showers (EAS), which provide abundant source of muons. These particles can be used for various applications of muon radiography, in particular to study the internal structure of different volcanoes edifice. In this talk we will present results leaded by young scientists in Colombia, andthe relevance to provide guidance to future young undergraduate and high school students in software as ROOT, GEANT4 and C++ and their applications in fields as high energy physics. As part ofthe results to be presented, we will show the first study of the muon lateral distribution at Pasto City altitude (4276 m a.s.l.) using CORSIKA to model the interaction of the cosmic rays with the atmo- sphere. Furthermore the first simulation in GEANT4 of an active volcano in Pasto city (Colombia) and a particle detector located near the volcano cone will be presented.
Poster Session and Reception / 392
Radiopurity Screening and Radiological Simulation for DUNE
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Author: Jason Stock1
Co-author: Juergen Reichenbacher 1
1 South Dakota School of Mines and Technology
Corresponding Author: [email protected]
The design of the far detector of the Deep Underground Neutrino Experiment (DUNE) consistsof four 10 kton supermodules, each filled with liquid Argon and to be located underground at SURF/SD. Radiological backgrounds are mostly relevant for the low-energy physics of DUNE, such as super- nova neutrinos. Radiopurity requirements are driven by the intrinsic Ar-39 contamination of about 1 Bq/kg for undepleted liquid argon. The long electron drift length of about 3.5 m inside eachtime projection chamber, as well as the one sided light collection, complicate further the impact of radio- logical backgrounds from detector materials. The radiopurity screening of detector materials will be discussed and how the results enter a comprehensive radiological simulation using LArSoft. Additionally, LArSoft improvements to the usability of the photon simulation are presented.
Computing, Analysis Tools, and Data Handling / 393
Applying Deep Learning in MicroBooNE
Author: Taritree Wongjirad1
Co-author: Kazuhiro Terao 2
1 MIT 2 Nevis Laboratories, Columbia University
Corresponding Author: [email protected]
Deep learning algorithms, which have emerged over the last decade, are opening up new ways to an- alyze data for many particle physics experiments. The MicroBooNE experiment, which is a neutrino experiment at Fermilab, has been exploring the use of such algorithms, in particular convolutional neural networks (CNNS). CNNs are the state-of-the-art method for a large class of problems requir- ing the analysis of image data. This makes CNNs an attractive approach as the MicroBooNE detector is a liquid argon time projection chamber, which produces high-resolution images of particle inter- actions. In this talk, I will discuss the ways CNNs can be applied to tasks like neutrino interaction detection and particle identification in MicroBooNE.
Poster Session and Reception / 394
Sterile neutrino search in the NOvA Far Detector.
Author: SIJITH EDAYATH1
Co-authors: Adam Aurisano 2; Alexandre Sousa 2; Gavin S. Davies 3; Louise Suter 4; Shaokai Yang 5
1 COCHIN UNIVERSITY OF SCIENCE AND TECHNOLOGY, INDIA 2 University of Cincinnati 3 Indiana University 4 FNAL 5 university of Cincinnati
Page 141 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Corresponding Author: [email protected]
The majority of neutrino oscillation experiments have obtained evidence for neutrino oscillations that are compatible with the three-flavor model. Explaining anomalous results from short-baseline experiments, such as LSND and MiniBooNE, in terms of neutrino oscillations requires the existence of sterile neutrinos. The search for sterile neutrino mixing conducted in NOvA uses a long baseline of 810 km between Near Detector (ND) at Fermilab and Far Detector (FD) in Minnesota. The signal for sterile neutrino oscillations is a deficit of neutral-current neutrino interactions at the FD with respect to the ND prediction. In this poster, I will present the analysis improvements that we are im- plementing for future NC sterile neutrino searches with NOvA. These include: improved modelling of our detector response; the inclusion of NC 2p2h interaction modelling; implementing a better en- ergy reconstruction technique; and including possible oscillation due to sterile neutrinos in the ND. This improvements will enable us to do a simultaneous ND-FD shape fit of the NC energy spectrum covering a wider sterile mass range than previous analyses.
Beyond Standard Model / 395
Searches for exotica at LHCb
Author: Marco Gersabeck1
1 The University of Manchester
Corresponding Authors: [email protected], [email protected]
A flexible trigger system, excellent vertex locator, particle identification detectors, and forwardac- ceptance allow unique exotica measurements to be performed at LHC energies using data collected with the LHCb detector. A summary of results will be presented, including searches for long-lived particles decaying into jet pairs or semileptonically.
Quark and Lepton Flavor / 398
Lepton-flavour universality tests with semi-leptonic B decays at LHCb
Author: Marco Gersabeck1
1 The University of Manchester
Corresponding Authors: [email protected], [email protected]
In the Standard Model, the three charged lepton are identical copies of each other, apart from mass differences. Experimental tests of this feature in decays of semileptonic b hadrons, suchas B->D*taunu, are highly sensitive to New Physics particles which preferentially couple to the 3rd generation. This talk will review the latest lepton universality tests in semileptonic b->c transitions at LHCb.
Quark and Lepton Flavor / 399
Semi-leptonic B decays at LHCb
Author: Marco Gersabeck1
Page 142 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
1 The University of Manchester
Corresponding Authors: [email protected], [email protected]
With large branching fractions and controllable theoretical uncertainties, semileptonic B decays are excellent tools for measuring B hadron properties such as lifetimes, as well as the determination of the CKM matrix elements, |Vxb| and studying non-perturbative QCD. This talk will review the latest measurements with semileptonic B decays at the LHCb experiment.
Quark and Lepton Flavor / 400
CP violation and mixing in charm at LHCb
Author: Marco Gersabeck1
1 The University of Manchester
Corresponding Authors: [email protected], [email protected]
LHCb continues to expand its world-leading sample of charmed hadrons collected during LHC’s Run 1 (2010-2012) and Run 2 (2015- present). This sample is yielding some of the most stringent testsof the Standard Model understanding of charm physics. This includes precise measurements of the neutral D-meson mixing parameters and some of the most sensitive searches for direct and indirect CP violation in charm interactions. The latest LHCb measurements from these research areas are presented.
Quark and Lepton Flavor / 401
Rare decays at LHCb
Author: Marco Gersabeck1
1 The University of Manchester
Corresponding Authors: [email protected], [email protected]
Rare decays are flavour changing neutral current processes that allow sensitive searches forphe- nomena beyond the Standard Model (SM). In the SM, rare decays are loop-suppressed and new particles in SM extensions can give significant contributions. The very rare decay Bs->mumu is in addition helicity suppressed and constitutes a powerful probe for new (pseudo) scalar particles. Of particular interest are furthermore tests of lepton universality in rare b->sll decays. The LHCb experiment is designed for the study of b and c hadron decays and ideally suitedforthe analysis of rare decays due to its high trigger efficiency, as well as excellent tracking and particle identification performance. Recent results from the LHCb experiment in the area of rare decays are presented, including tests of lepton universality and searches for lepton flavour violation.
Quark and Lepton Flavor / 402
New physics searches in b->sll decays
Author: Sheldon Stone1
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1 Syracuse University
Corresponding Author: [email protected]
Rare b->sll decays are flavour changing neutral current processes that are forbidden at the lowest perturbative order in the Standard Model (SM). As a consequence, new particles in SM extensions can significantly affect the branching fractions of these decays and their angular distributions. The LHCb experiment is ideally suited for the analysis of these decays due to its hightriggereffi- ciency, as well as excellent tracking and particle identification performance. Recent results from the LHCb experiment in the area of b->sll decays are presented and their inter- pretation is discussed.
Quark and Lepton Flavor / 403
Heavy hadron spectroscopy at LHCb
Author: Ivan Polyakov1
1 CERN
Corresponding Author: [email protected]
We report on the first observation of excited hadronic states in both the charm and beauty sector with special emphasis on the observation of five excited Omega_c states. Similar techniques are used to search the LHCb data for states observed in other datasets, such as the tetraquark state X(5568) whose evidence was reported by D0.
Quark and Lepton Flavor / 404
Pentaquark & tetraquark states at LHCb
Author: Marco Gersabeck1
1 The University of Manchester
Corresponding Authors: [email protected], [email protected]
The observation of two pentaquark resonances and the proof of the resonant nature of the Zcstate opened to the search for the many isospin partner of these multi-quark states. We review the studies of these states and discuss the prospects for the analyses of the LHCb Run2 data.
QCD / 405
Heavy flavour production at LHCb
Author: Marco Gersabeck1
1 The University of Manchester
Corresponding Authors: [email protected], [email protected]
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Heavy flavour production measurements in proton-proton collisions are important tests ofQCD. We report on updated production cross-section measurement of quarkonia, open-charm, and open- beauty states. Other aspects related to the quarkonium production mechanisms, such as the produc- tion of charmonium state in jets, will be discussed.
Quark and Lepton Flavor / 406
0 − A novel, precise measurement of Bs and Ds lifetimes at LHCb
Author: Marco Gersabeck1
1 The University of Manchester
Corresponding Authors: [email protected], [email protected]
0 The LHCb collabotration reports on a new measurement of the flavor-specific Bs lifetime and of the 0 Ds lifetime based on semileptonic decays. Using proton-proton collisions at center-of-mass energies −1 0 → (∗)− + of 7 and 8 TeV, and corresponding to 3.0 fb of integrated luminosity, Bs Ds µ νµ decays are partially reconstructed in the K+K−π−µ+ final state. Based on a novel approach, the lifetimes 0 are determined from the variation in the Bs signal yield as a function of decay time, relative to that of B0 decays that are reconstructed in the same finel state, and whose lifetime is precisely known. The use of kinematically similar B0 decays as a reference allows the reduction of the uncertainties from partial reconstruction and lifetime-biasing selection criteria. The results greatly improve over the current determinations. Our approach circumvents the systematic limitations typically associ- ated with lifetime measurements using semileptonic decays in hadron collisions and paves the way toward a fruitful program of similar measurements.
Computing, Analysis Tools, and Data Handling / 407
Advanced machine-learning solutions in LHCb operations and data analysis
Author: Marco Gersabeck1
1 The University of Manchester
Corresponding Authors: [email protected], [email protected]
The LHCb detector is a forward spectrometer optimized for the reconstruction of charm- andbottom- hadron decays in LHC’s proton-proton collisions. The need to process large amounts of data within the constraints of the data-acquisition andoffline- computing resources pushes steadily toward usage of advanced data-analysis techniques. Currently, LHCb takes data at rates significantly higher than the design values, thanks also to purpose-developed machine- learning (ML) solutions. Such soliutions are applied to an increasing class of essential online and offline tasks, including more precise and faster real-time classification of interesting events, smarter detector-performance calibrations, and more precise, efficient, and unbiased offline characterization of reconstructed events. This talk overviews recent original ML applications in the trigger, operations, and analysis ofLHCb data in 2015-2016 and discusses ongoing and future developments.
Higgs and EWSB / 409
Page 145 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Two Top Utilities of Two Higgs Doublets: Electroweak Baryogen- esis and Alignment
Author: George W.S. Hou1
1 National Taiwan University
Corresponding Author: [email protected]
Existence of a second Higgs doublet is highly likely, but we should let Nature decide on its couplings, and not impose extra discrete symmetry. Besides new flavor changing neutral Higgs couplings, a new top Yukawa coupling of theheavy neutral Higgs bosons Hˆ0 and Aˆ0 (denoting 125 GeV boson as h, the SM-like Higgs), is naturally of order 1 in strength. It also naturally carries a new CPV phase. Together with order 1 Higgs boson couplings involving the exotic Higgs bosons, there can be sufficient CPV as well as strong first order electroweak phase transition for sufficient electroweak baryogenesis. The order 1 newtop Yukawa and Higgs couplings would balance each other naturally, such that apparent alignment could result, without decoupling. The relatively strong couplings and CPV phase in the new top Yukawa coupling lead to many testable phenomenological consequences, such as electron edm, higgs to two photons, t -> ch, triple Higgs coupling, and possibilities for h -> mu tau and tau -> mu gamma.
Poster Session and Reception / 410
Exploring end-to-end image-based deep learning for particle & event classification
Author: Michael Andrews1
Co-authors: Manfred Paulini 1; Sergei Gleyzer 2
1 Carnegie Mellon University 2 University of Florida
Corresponding Author: [email protected]
An essential part of new physics searches at the Large Hadron Collider at CERN involves event clas- sification, or distinguishing signal decays from one of its many background look-alikes. Traditional techniques have relied on reconstructed particle candidates and their physical attributes. However, such reconstructed data are the result of a long, potentially lossy process of forcing the raw sensor data into progressively more physically intuitive quantities. Meanwhile, powerful image-based ma- chine learning algorithms have emerged that are able to directly digest raw sensory data and output a prediction—so called end-to-end deep learning classifiers. We explore the use of such algorithms to perform physics classification using raw sensory data from the CMS detector. As proof of concept, we classify photon- versus electron-induced ECAL showers and compare the performance of using raw sensor data versus shower shape data.
Computing, Analysis Tools, and Data Handling / 411
Deep Learning and DUNE
Author: Alexander Radovic1
1 College of William and Mary
Page 146 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Corresponding Author: [email protected]
The observation of neutrino oscillations provides evidence of physics beyond the standard model, and the precise measurement of those oscillations remains an important goal for the field of particle physics. The planned DUNE experiment is set to become a leading experiment in the study ofneu- trino oscillations. Taking advantage of a two-detector technique, a tightly focused beam at Fermilab, and a far detector based on cutting edge Liquid Argon Time Projection chamber technology, DUNE will in a prime position to deliver precision measurements of the neutrino mass hierarchy, and CP violation. A key part of the delivery of those precision measurement will be the accurate identification and reconstruction of neutrino interactions in the DUNE far detector. Liquid Argon Time Projection chambers are rich sources of physical information, offering the equivalent of incredibly high resolu- tion “images” of the particles produced in neutrino interactions. Conventional reconstruction tools have so far struggled to fully exploit the promise of that rich source of information, particularly compared to expert human event scanners. This talk will describe a variety of novel ways inwhich cutting edge deep learning tools are being explored to aid both event reconstruction and selection in DUNE detector simulations.
412 Status of Two-Higgs-doublet model with LHC 13 TeV data
Author: Debtosh Chowdhury1 Co-authors: Ayan Paul 2; Enrico Franco 1; Luca Silvestrini 1; Marco Ciuchini 3; Otto Eberhardt 4
1 INFN, Rome 2 INFN, Sezione di Roma 3 INFN,Rome3 4 IFIC, Valencia
Corresponding Author: [email protected]
The Two-Higgs-doublet model (2HDM) is one of the most studied extensions of the Standard Model. But just as the other popular “New Physics” models, it gets more and more constrained by recent experimental progress, especially by the LHC data. For all four 2HDM types with a softly broken Z2 symmetry, we present updated results of global analyses obtained with the open-source HEPfit code. We emphasize the impact of the LHC run II data.
Neutrino II / 413
Signal Simulation and Processing in the MicroBooNE LArTPC
Author: Brian Kirby1
1 Brookhaven National Lab
Corresponding Author: [email protected]
MicroBooNE is an 85-ton Liquid Argon Time Projection Chamber (LArTPC) and the first of a trio of LArTPCs in the Short Baseline Neutrino (SBN) program which will search for a light sterile neutrino and measure neutrino-argon interaction cross sections. Located in the Booster neutrino beam at Fermi National Accelerator Laboratory, MicroBooNE has been taking neutrino data since October 2015. In this talk, we will describe the reconstruction of the distribution of ionization electrons given the induced current in all wire planes. Owing to the ultra-low noise cold electronics inside the LAr, the first successful extraction of the ionization charge from the induction wire planesin
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single-phase LArTPCs has been achieved. This development opens up new possibilities for using charge information to assist the event reconstruction. Latest results of a quantitative evaluation of the signal processing using full TPC signal simulation and a comparison of data and Monte Carlo will be shown.
Beyond Standard Model / 414
Current status of MSSM Higgs sector with LHC 13 TeV data
Author: Debtosh Chowdhury1
Co-authors: Arghya Choudhury 2; Biplob Bhattacherjee 3; Jayita Lahiri 3; Rahool Kumar Barman 3; Shamayita Ray 4
1 INFN, Rome1 2 University of Sheffield 3 CHEP, IISc 4 University of Calcutta
Corresponding Author: [email protected]
ATLAS and CMS collaborations have reported the new results on Higgs search analyzing data from run II of LHC at 13 TeV. In this work we study the Higgs sector of the phenomenological Minimal Supersymmetric Standard Model, in the light of the new Higgs data presented at ICHEP 2016, on and above the existing Run-I data, and comment on their relative impacts. One of the major impact of the new data on the parameter space comes from the H → τ +τ − direct search limit which rules out the high tan β regions more efficiently than the Run-I data. Secondly, we show that the latest result of the rare radiative decay of the B meson presented by the Belle collaboration at ICHEP 2016 constrains significantly the low tan β and low mA region of the parameter space than its previous value.
QCD / 415
Update on CTEQ-TEA PDFs
Author: Carl Schmidt1
1 Michigan State University
Corresponding Author: [email protected]
We present recent progress on the parton distribution functions (PDFs) of the proton from the CTEQ- TEA collaboration.
Particle Detectors / 416 protoDUNE-SP Cold Electronics Quality Control
Author: Brian Kirby1
1 Brookhaven National Lab
Page 148 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Corresponding Author: [email protected]
The protoDUNE-SP detectors are large-scale prototypes of the single-phase Liquid Argon TimePro- jection Chamber (LArTPC) and cold electronics designs proposed for the Deep Underground Neu- trino Experiment (DUNE). TPC wires will be instrumented by 15360 readout channels implemented with low noise shaping-amplifier and digitization ASICs integrated into Front End Motherboards (FEMBs) operating at cryogenic temperature within the cryostat. The large number of electronics channels and high performance specifications require a large-scale production electronics quality control effort including highly automated test methods under realistic cryogenic operating condi- tions. This talk will summarize the protoDUNE-SP cold electronics quality control plan, detailsof its implementation and preliminary results.
QCD / 417
QCD multiple scattering in cold nuclear matter
Author: HONGXI XING1
Co-authors: Jianwei Qiu 2; Xin-Nian Wang 3; Zhongbo Kang 4
1 Northwestern Univ./Argonne National Lab 2 Brookhaven National Laboratory 3 LBNL 4 University of California Los Angeles
Corresponding Authors: [email protected], [email protected]
Multiple scatterings of energetic partons inside cold or hot nuclear matter play an important role in the study of the QCD medium in high-energy e+A, p+A, and A+A collisions. They lead to par- ton energy loss and transverse momentum broadening that are responsible for the well-known jet quenching phenomena. In this talk, we present some of our recent theoretical developments on radiative higher-order corrections to parton multiple scattering in the medium. We demonstrate how QCD factorization holds at next-to-leading order for multiple parton scattering in cold nuclear matter and discuss its implication for the medium properties. In particular, we emphasize the univer- sality of the properties of nuclear matter as probed by a propagating parton, and identify theQCD scale and jet energy dependence (QCD evolution) of the jet transport parameter (qhat) as revealed by either quark or gluon jets.
Computing, Analysis Tools, and Data Handling / 418
Conceptualization of a Scientific Software Innovation Institute for HEP and a Community Roadmap Process for Software and Computing R&D
Authors: Mark Neubauer1; Michael Sokoloff2; Peter Elmer3
1 University of Illinois at Urbana-Champaign 2 University of Cincinnati 3 Princeton University
Corresponding Author: [email protected]
Realizing the physics goals of the planned or upgraded experiments in high-energy physics (HEP) over the next 10 years will require the HEP community to address a number of challenges in the area of software and computing. In order to identify and prioritize research and development in
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scientific software and computing infrastructure, a broad HEP community planning process iscur- rently underway. The aim is to produce a Community White Paper (CWP) which will describe the community strategy and a roadmap for HEP software and computing R&D for the 2020s – anac- tivity organized under the umbrella of the HEP Software Foundation. In this talk, we describe the current status of the CWP process. We also discuss the conceptualization of a possible NSF Scientific Software Innovation Institute for high-energy physics designed to address software and computing challenges for the HL-LHC.
Quark and Lepton Flavor / 419
Direct CP asymmetry in D -> piˆ+\piˆ- and D -> Kˆ+Kˆ- from QCD Light-Cone Sum Rules
Author: Alexey Petrov1
Co-author: Alexander Khodjamirian 2
1 Wayne State University / MCTP 2 Siegen U
Corresponding Author: [email protected]
Precise unambiguous predictions of CP-violating observables in charm decays are hard and often plagued by non-perturbative uncertainties. We calculate hadronic matrix elements with penguin topology in the weak nonleptonic D -> piˆ+\piˆ- and D -> Kˆ+Kˆ- decays using techniques of light- cone QCD sum rules. With that, we perform numerical analysis and estimate the direct CP-asymmetry in D -> piˆ+\piˆ- and D -> Kˆ+Kˆ- decays.
Dark Matter / 420
The XENONnT Dark Matter Experiment
Author: Kaixuan Ni1
1 UC San Diego
Corresponding Author: [email protected]
With XENON1T leading the search for dark matter, the XENON collaboration has started toplan an upgrade of the detector for the next phase, referred to as XENONnT. The XENONnT experiment will utilize the already built and functioning XENON1T infrastructures, such as the cryogenic system, Kr distillation system, and Xe storage and recovery system, with the time projection chamber (TPC) as the main upgrade. The upgraded XENONnT detector will be filled with 7.5 tons of ultra-pure liquid xenon, tripling the active liquid xenon target mass of XENON1T. About 500 low-radioactive three-inch R11410 PMTs will be used. Background from internal sources such as radon will be reduced. It will enable another order of magnitude improvement in dark matter search sensitivity compared to that of XENON1T, or accumulate statistics if a positive dark matter signal is observed by XENON1T. The detailed TPC upgrade plan, background control and reduction techniques, and predicted sensitivity reach will be presented.
Top Quark Physics / 421
P5’ anomaly for top: tZ’ associated production at LHC
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Author: George W.S. Hou1
1 National Taiwan University
Corresponding Author: [email protected]
The LHCb experiment uncovered the P5’ anomaly, a deviation in data from Standard Model expectations in the said B -> K*mumu angular observable. This has motivated a possible Z’ boson that couples to left-handed b to s transitions, where a model would be the gauged L_mu - L_tau symmetry, but direct search for such a Z’ is not promising. Less constrained is a similar Z’, but coupling to right-handed t to c transitions. Motivated by this, we study cg -> tZ’ associated production at LHC, both for a generic model, and in the L_mu - L_tau with a vector-like U quark as its realization. We also study cc(bar) -> Z’ production that would exist within the model. Both processes can be probed already by LHC Run 2 data, all the way up to the HL-LHC.
Neutrino Physics / 422
The NEXT Experiment
Author: Benjamin Jones1
1 UTA
Corresponding Author: [email protected]
For experiments searching for neutrinoless double beta decay, rejection of backgrounds from ra- dioactivity will be pivotal for success. Gaseous xenon TPC detectors offer unique background re- jection capabilities over solid- and liquid-phase technologies. The NEXT-NEW detector is presently operating in the Laboratorio Subterráneo de Canfranc (LSC), and will be followed by the NEXT-100 neutrinoless double beta decay search. This talk will describe the status of the NEXT program and present some early data from NEXT-NEW. It will also describe R&D towards ultra-low-background xenon gas detectors, including the development of a barium daughter tagging scheme based on sin- gle molecular fluorescence imaging.
Particle Detectors / 423
Design layout and expected performance of Inner Tracker for AT- LAS Phase 2 Upgrade
Author: Swagato Banerjee1
1 University of Louisville
Corresponding Author: [email protected]
The large data samples at the High-Luminosity LHC will enable precise measurements oftheHiggs boson and other Standard Model particles, as well as searches for new phenomena such as supersym- metry and extra dimensions. To cope with the experimental challenges presented by the HL-LHC such as large radiation doses and high pileup, the current Inner Detector will be replaced with a new all-silicon Inner Tracker for the Phase II upgrade of the ATLAS detector. Optimization of de- sign layouts and expected performance are presented that extend the pseudorapidity coverage of the tracking geometry to |η| < 4.
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QCD / 424
The spin-dependent quark beam function at NNLO
Author: Ulrich Schubert1 Co-authors: Frank Petriello 2; HONGXI XING 3; Radja Boughezal 1
1 Argonne National Laboratory 2 Northwestern University 3 Los Alamos National Laboratory
Corresponding Author: [email protected]
The question of how the nucleon’s spin is distributed among the partons is one of theimportant unsolved problems in physics and has recently received substantial attention from experimental measurements. In order to fully exploit these measurements an accurate theoretical description of the observables is required. The N-jettiness subtraction scheme provides a framework in which the desired accuracy can be achieved. In this talk I present the calculation of the beam function for longitudinally polarized quarks through next-to-next-to-leading order (NNLO) in QCD perturbation theory. This is the last missing ingredi- ent needed to apply the factorization theorem for the N-jettiness event-shape variable in polarized collisions through the NNLO level. A special emphasis is given to the computational techniques, used to perform this computation and the treatment of the fifth gamma matrix in dimensional regu- larization. The NNLO polarized quark beam function is an essential ingredient for describing polarized colli- sions at NNLO precision. Therefore its knowledge is a big step towards extending the global fitof the polarized proton structure to the NNLO level.
Neutrino Physics / 426
Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay
Author: David Martinez Caicedo1
1 Illinois Institute of Technology
Corresponding Author: [email protected]
The Daya Bay experiment has utilized eight functionally identical underground detectors tosam- ple reactor antineutrino fluxes from three pairs of nuclear reactors in South China, accruing the largest reactor antineutrino sample to date. This talk will summarize Daya Bay’s most recent result, which presents observations of correlations between reactor core fuel evolution and changes in the detected reactor antineutrino flux and energy spectrum. Four antineutrino detectors in two exper- imental halls were used to identify 2.2 million inverse beta decays (IBDs) over 1230 days spanning multiple fuel cycles for each of Daya Bay’s six 2.9 GW reactor cores. A 10σ variation in IBD yield was found to be energy-dependent, rejecting the hypothesis of a constant antineutrino energy spec- trum at 5.1 standard deviations. While measurements of the energy-dependence of this variation show general agreement with predictions from recent reactor models, the variation in integrated IBD yield disagrees with recent predictions at 3.1σ. This discrepancy indicates that an overall deficit in measured flux with respect to predictions does not result from equal fractional deficits fromthe primary fission isotopes 235U, 239Pu, 238U, and 241Pu. A 7.8% discrepancy between the observed and predicted 235U yield suggests that this isotope may be the primary contributor to the reactor antineutrino anomaly.
Poster Session and Reception / 427
Page 152 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Observing Neutrinos from the Next Galactic Supernova with the NOvA Detectors
Author: Justin Vasel1
1 Indiana University
Corresponding Author: [email protected]
The next galactic core-collapse supernova will deliver a wealth of neutrinos which for the firsttime we are well-situated to measure. These explosions produce neutrinos with energies between 10and 100 MeV over a period of tens of seconds. Galactic supernovae are relatively rare events, occurring with a frequency of just a few per century. It is therefore essential that all neutrino detectors capable of detecting these neutrinos are ready to trigger on this signal when it occurs. This poster describes a data-driven trigger which is designed to detect the neutrino signal from a galactic core-collapse supernova with the NOvA detectors. The trigger analyzes 5ms blocks of detector activity and ap- plies background rejection algorithms to detect the signal time structure over the background. This background reduction is an essential part of the process, as the NOvA detectors are designed to de- tect neutrinos from Fermilab’s NuMI beam which have an average energy of 2 GeV–well above the average energy of supernova neutrinos.
Precision Electroweak Physics / 428
Single W/Z boson production cross sections with the CMS detec- tor
Author: Jay Lawhorn1
1 Caltech
Corresponding Author: [email protected]
Measurements of single W and Z boson inclusive and differential production cross sections with the CMS detector are presented. Measurements of Drell-Yan cross sections in the mass range of 15 to 3000 GeV are also reported. The results are compared to predictions from different Monte Carlo generators.
Diversity, Education, and Outreach / 429
Mu2e Diversity and Inclusion Task Force
Author: Doug Glenzinski1
1 Fermilab
Corresponding Author: [email protected]
A Diversity and Inclusion Task Force for the Mu2e Experiment was formed in January of 2017. The charge was to “determine how Mu2e can effectively promote and develop diversity and inclusion within the experiment” with the goal of presenting a set of recommendations to the experiment at the June, 2017 Collaboration Meeting. In this work the Task Force defined “diversity and inclusion” within the context of Mu2e, gathered opinions from inside and outside of the experiment, and con- ducted a survey of collaboration members. In this talk we will present our findings, including a set of best practices that we assembled from other experiments and institutions.
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Quark and Lepton Flavor / 430
Prospects for rare B decays at Belle II
Author: Sam Cunliffe1
1 Pacific Northwest National Laboratory
Corresponding Author: [email protected]
Rare, and flavor-changing neutral current B decays are an important probe in the search for physics beyond the Standard Model. There have recently been several anomalies in rare B decays, and lepton- universality measurements, specifically involving the b → sl+l− quark transition. These results tend towards a non-Standard-Model interpretation. The Belle II experiment is a next-generation B-physics experiment located at SuperKEKB, anup- graded B-factory e+e− collider, in Tsukuba, Japan. The first data are expected in early 2018. This talk will describe prospects for many rare B decays at Belle II including b → sl+l− processes and oth- ers, such as b → (s, d)γ, b → sττ, and b → sνν. Areas where the Belle II program is complementary to the currently running LHCb experiment will be highlighted.
Poster Session and Reception / 434
Design and Simulation of the IsoDAR RFQ Direct Injection Sys- tem and Spiral Inflector
Author: Philip Weigel1
Co-authors: Daniel Winklehner 2; Daniela Campo 3; Janet Conrad 2
1 Drexel University 2 Massachusetts Institute of Technology 3 INFN
Corresponding Author: [email protected]
The IsoDAR (Isotope Decay-At-Rest) experiment aims to explore physics beyond the standard model by searching for anomalous neutrino oscillations indicative of sterile neutrinos. The experiment re- quires a primary beam of H2+ ions to be accelerated to an energy of 60 MeV/amu at a current of 5 mA, which will be accomplished by using a high-power compact cyclotron. One of the challenges in this scheme is the injection into the cyclotron, where space-charge forces are strong and accep- tance into a small RF phase window is desired. We aim to achieve this by using a Radio-Frequency Quadrupole (RFQ) injector, brought very close to the center of the cyclotron, which is capableof efficiently transporting and bunching the beam before an electrostatic deflector - called a spiralin- flector - turns the beam onto the mid-plane of the cyclotron for acceleration. Careful designand simulation of this process is necessary. To this end, electric and magnetic field maps are generated in OPERA and loaded into the accelerator simulation code OPAL to run start-to-end simulations of the injection system and first few turns in the cyclotron. Several iterations between RFQ designand spiral inflector simulations will be necessary to optimize the geometry of the spiral inflector, i.e.to minimize the number of ions lost during injection and maximize beam current. I will present the development and latest results of the particle simulations and design optimizations for the IsoDAR RFQ direct injection project, particularly the spiral inflector.
Poster Session and Reception / 435
Seasonal Variations of multiple-muons in NOvA
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Author: Maury Goodman1
Co-authors: Philip Schreiner 2; Ricardo Gomes 3; Stefano Castro Tognini 4
1 Argonne 2 Benedictine University 3 Federal University of Goias - UFG 4 Federal University of Goias
Corresponding Authors: [email protected], [email protected]
Seasonal variations of cosmic ray muons have been well-measured by a number of underground experiments at a variety of overburdens and it has been found that the rate of muons increases in the summer and decreases in the winter. This is understood from the properties of the atmosphere as the temperature varies. But with large statistics the seasonal variation of multiple muons was measured in the MINOS ND (225 mwe) and the MINOS FD (2100 mwe). The rates increase in the winter and decrease in the summer, opposite to the result for single muons. Several hypotheses for this unexpected result were considered, but the effect is not currently explained. New data from the NOvA ND (225 mwe) will be used to study the situation further.
Computing, Analysis Tools, and Data Handling / 436
Belle II Distributed Data Management System and Networking
Authors: Malachi Schram1; Vikas Bansal2
Co-author: Antonio Ledesma 1
1 PNNL 2 Pacific Northwest National Laboratory
Corresponding Author: [email protected]
The Belle II experiment at the SuperKEKB collider in Tsukuba, Japan, will start physics data takingin 2018 and will accumulate 50/ab of e+e- collision data, about 50 times larger than the data set of the Belle experiment. The computing requirements of Belle II are comparable to those of a RunILHC experiment. Computing at this scale requires efficient use of the compute grids in North America, Asia and Europe and will take advantage of upgrades to the high-speed global network. We present the architecture of data flow and data handling as a part of the Belle II Distributed Data Management system and show recent network data challenge results.
QCD / 437
Analytic resummation of TMD distributions in momentum space in SCET_II.
Authors: Daekyoung Kang1; Varun vaidya2; christopher Lee2
1 Los Alamos National Lab 2 lanl
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Corresponding Author: [email protected]
We study the transverse momentum spectra of gauge bosons ( Z, γ∗, Higgs) in PP collisions in the regime of low transverse momentum. We also develop a scheme of resummation allowing us to choose the factorization scale for virtuality in momentum space which is then applied to obtain the transverse momentum spectra for the Drell-Yan and Higgs at NNLL accuracy. Using this scheme, we show, for the first time, how an analytic formula for these cross sections can be obtained ateach order of resummation. Finally, a comparison with other resummation schemes is presented along with a discussion of possible non-perturbative effects.
Computing, Analysis Tools, and Data Handling / 438
Large-scale Simulation and Data Processing in the NOvA Experi- ment
Author: Adam Moren1
1 University of Minnesota, Duluth
Corresponding Author: [email protected]
The NOvA experiment at Fermilab is a long-baseline neutrino experiment designed tostudy νe ap- pearance in a νµ beam. The detectors’ fine-grained design and many resultant channels, coupled with the variety of physics triggers, the high-intensity NuMI neutrino beam, and the large cosmic ray muon rate at the far detector location, together result in computing requirements previously un- precedented for a neutrino experiment. NOvA uses numerous advanced computing infrastructure tools to manage this data at high throughput. The 9 petabytes (70 million files) of simulated, raw, and reconstructed data currently maintained by the experiment are stored on tape and archived, catalogued, and addressed using Fermilab’s Sequential Access via Metadata (SAM) system. Files are staged into cache areas using a massively extensible and parallelizable system called dCache, allowing sustained total data transfer rates of over 1 Gbps to a worldwide network of processing node farms. The experiment’s software code is also deployed worldwide using the CERN VMFile System (CVMFS), allowing fast, scaleable, site-independent access to the codebase. These develop- ments enable NOvA to make heavy use of the Fermigrid and Open Science Grid to do simulation and processing, so that in steady state production, in excess of 10 million neutrino interactions can be simulated and analyzed per day. NOvA’s extensive use of new computing tools continues to support the broad physics program that the experiment hosts, and has paved the way for their use by other current and future Intensity Frontier experiments at Fermilab.
Cosmology and Astrophysics / 439
Measuring the pairwise kinematic Sunyaev-Zel’dovich effect with the Atacama Cosmology Telescope
Author: Eve Vavagiakis1 Co-authors: Francesco De Bernardis 1; Michael Niemack 1; Nick Battaglia 2; Simone Aiola 2
1 Cornell University 2 Princeton University
Corresponding Author: [email protected]
We have made improved measurements of the kinematic Sunyaev-Zel’dovich (kSZ) effect using data from the Atacama Cosmology Telescope (ACT) and the Baryon Oscillation Spectroscopic Survey (BOSS). A map of the Cosmic Microwave Background (CMB) composed from two seasons of ob- servations each by ACT and the Atacama Cosmology Telescope Polarimeter (ACTPol) receiver was
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used. The mean pairwise baryon momentum associated with the positions of 50,000 bright galax- ies in the BOSS DR11 Large Scale Structure catalog was evaluated over the 600 square degrees of overlapping sky area. The kSZ signal arising from the large-scale motions of clusters was measured by fitting data to an analytical model, with the free parameter of the fit determining theoptical depth to microwave photon scattering for the cluster sample. Our most conservative simulation- based uncertainty estimates for the mean pairwise momenta as a function of galaxy separation gave signal-to-noise values between 3.6 and 4.1 for various luminosity cuts. A novel approach to estimat- ing cluster optical depths from the average thermal Sunyaev-Zel’dovich (tSZ) signal at the cluster positions was explored, and our results are broadly consistent with those obtained from the kSZ sig- nal. In the future, the tSZ signal may provide a valuable source of cluster optical depths, enabling the extraction of velocities from the kSZ sourced mean pairwise momenta. The mean pairwise velocity of clusters is sensitive to the growth of structure and the Universe’s expansion history, making it an excellent probe for gravity on large scales and a means for neutrino mass sum constraints. New CMB maps from multi-frequency ACTPol observations promise to improve statistics and systemat- ics for SZ measurements. With these and other upcoming data, such as measurements from DESI, CCAT-prime, and Simons Observatory, the pairwise kSZ signal is poised to become a powerful new cosmological tool, able to test models of modified gravity and dark energy and constrain neutrino physics.
Diversity, Education, and Outreach / 441
Advocating for HEP in Congress
Author: Louise Suter1
1 FNAL
Corresponding Author: [email protected]
I will present a summary of the annual HEP advocacy trip jointly run by the Fermilab Users Execu- tive Committee, the SLAC Users Executive Committee, and US-LHC Users Association. Thisannual trip consists of roughly 50 scientists who meet with representatives from more than 70% of the con- gressional districts spread across both chambers and parties. I will discuss the impact of this trip and the positive reception the P5 report has received and its effect on the appropriations process.
Dark Matter / 442
Dark Matter Search Results from the PICO-60 C3F8 Bubble Cham- ber
Author: Orin Harris1
1 NEIU
Corresponding Author: [email protected]
The PICO-60 dark matter detector has recently concluded its first run with a C3F8 target, producing a new world-leading limit on WIMP-proton spin-dependent interactions, a factor of 17 stronger than PICO’s previous leading result. This result is obtained from a blind 30 live-day run that contained zero WIMP candidate events and re-affirms the dominance of the bubble chamber technology in searching for this type of interaction. The absence of events confirms that the bubble chamber technology is background-free and ready for future ton-scale dark matter detectors.
Cosmology and Astrophysics / 443
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Cluster Cosmology with the South Pole Telescope
Author: Lindsey Bleem1
1 Argonne National Laboratory
Corresponding Author: [email protected]
The South Pole Telescope (SPT) is a 10-meter millimeter-wavelength telescope optimized forhigh resolution observations of the Cosmic Microwave Background (CMB). The SPT has been used to conduct several wide-area surveys: the 2500-square-degree SPT-SZ survey (completed in 2011) as well as two recently completed surveys conducted using the SPTpol receiver: the 500-square-degree SPTpol Survey and the SPTpol Extended Cluster Survey (the former surveyed ˜20% of the SPT-SZ footprint to a level 3x deeper than the SPT-SZ survey, the latter covered an additional 2500-square- degrees to somewhat shallower depths than SPT-SZ). One of the primary objectives of the wide-area SPT surveys was the construction of a mass-limited sample of galaxy clusters identified via the thermal Sunyaev- Zel’dovich (SZ) effect, through which massive clusters imprint subtle temperature distortions on the CMB sky. The abundance of such clusters is a powerful cosmological probe as it depends sensitively upon both the expansion history of the universe and the growth of density fluctuations. In this talk I will discuss progress analyz- ing these three datasets including updated cosmological constraints from the initial SPT-SZ cluster sample using new weak lensing data as well as ongoing work characterizing the strong lensing prop- erties of these systems using the new PISCO imager on Magellan. The results presented in this talk will be significantly improved with data from the SPT-3G survey—deployed in Jan 2017—that will identify an order of magnitude more clusters than past generation SZ surveys.
444 Towards a high precision calculation for the longitudinal spin asymmetry in deep inelastic scattering
Author: HONGXI XING1
Co-authors: Frank Petriello 2; Radja Boughezal 3; Ulrich Schubert 3
1 Northwestern Univ./Argonne National Lab 2 Northwestern University 3 Argonne National Laboratory
Corresponding Author: [email protected]
The precision of perturbative QCD calculations has been reached an impressive level to testthe standard model in modern hadron colliders. However, high precision computations (such as NNLO) for polarized collisions are still very limited to determine accurately the fundamental spin structure of the proton. In this talk, we present the first NNLO calculation for single-inclusive jet production in polarized lepton-proton collisions. In particular, we show the application of N-jettiness subtraction scheme in performing higher-order computations for polarized scattering processes. This method allows for a completely differential description of the cross section to match the desired experimental measurements. We further show our predictions for double longitudinal spin asymmetry up to NNLO, and demonstrate that our calculation is of particular interest to the physics program of a future Electron Ion Collider.
Diversity, Education, and Outreach / 445
Social media and innovative outreach
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Author: Lauren Biron1
1 Fermi National Accelerator Laboratory
Corresponding Author: [email protected]
People are hungry for knowledge and entertainment, and they’re seeking it on social media. When most physicists think of science outreach, they often think of in-person talks to a room full of people, open houses, or written articles in big-name publications. But scientists have an opportunity toreach a bigger, broader, more diverse audience through social media platforms. In this presentation, we’ll provide an overview of the major platforms (such as Facebook, Instagram, Twitter, Snapchat, and YouTube), best practices for posting on them, how to use them to augment outreach you are already doing, and whom you can expect to reach. We’ll also discuss examples of other innovative methods of outreach (such as virtual reality, 360 tours, and games) and how to help this content (as well as traditional articles) flourish through sharing on social media.
Computing, Analysis Tools, and Data Handling / 447
Exploring Computing Methods for Improved Cosmic Background Rejection in NOvA’s Sterile Neutrino Searches
Author: Shaokai Yang1
Co-authors: Alexandre Sousa 2; Enhao Song 3; Louise Suter 4
1 university of Cincinnati 2 University of Cincinnati 3 University of Virginia 4 FNAL
Corresponding Author: [email protected]
We are witnessing a revolution happening in experimental HEP based on the current innovations in deep machine learning technologies. For example, Convolutional neural networks (CNNs) have been introduced to identify particle interactions in particle tracking detectors based on their topol- ogy without the need for detailed reconstruction and outperforms currently used algorithms. We are trying to further improve the performance of CNNs applied to the NOvA experiment by: train- ing the algorithms to separate a single particle interaction from others (image/particle segmentation phase), classifying the specific interaction type for the separated interaction (image/particle clas- sification phase), and finally, estimating the classification uncertainty. We are developing anew method to select particle interactions based on TensorFlow, a CNN framework released and sup- ported by Google. In this talk, we will detail the algorithm and its performance when applied to NOvA simulation.
Cosmology and Astrophysics / 449
Study of Galaxy Evolution in DES Clusters
Author: Antonella Palmese1
Co-authors: Brian Welch 2; Huan Lin 3; James Annis 3; Marcelle Soares-Santos 3
1 Fermilab/UCL 2 University of Chicago 3 Fermilab
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Clusters of galaxies represent a powerful probe for cosmology in the era of large photometric surveys such as the Dark Energy Survey. At the same time, understanding the astrophysical processes that drive their evolution is needed for a correct cosmology: cluster galaxies show particular properties with respect to field galaxies, processes like cluster membership selection often require knowledge of clusters and galaxy evolution. In particular, the efficiency with which halos convert the matter they contain into stars is still matter of debate and it is crucial for understanding galaxy formation and evolution. We present a measurement of the stellar-to-halo mass relation for the DES Year 1 redmapper clusters, showing the results for centrals, satellites and total content. We also explore the evolution of the fraction of blue galaxies and the star formation rate. We show that stellar mass is also a powerful mass proxy for clusters by comparing our results to X-ray temperature measurements that overlap with the DES Y1 footprint.
Particle Detectors / 450
Directional measurements of fast neutron backgrounds at SuperKEKB
Author: Michael Hedges1
1 BEAST II Collaboration
Corresponding Author: [email protected]
During the commissioning of the SuperKEKB accelerator, the next-generation B factory located in Tsukuba, Japan, the BEAST II detector system was used to measure beam induced backgrounds. Fast neutrons have proven to be a notoriously pernicious background at collider experiments. Among the many measurements made by BEAST II, the Micro Time Projection Chambers (µTPCs) subsys- tem provided direction-sensitive measurements of fast neutrons by reconstructing the charge clouds from nuclear recoils in gas with high spatial resolution. We present measurements from the first Su- perKEKB run, and compare the resulting data with beam-loss and detector simulations.
Poster Session and Reception / 451
ProtoDUNE Trigger Study
Authors: David Rivera1; Jonathon Sensenig1
Co-authors: Lige Zhang 1; Nuno Barros 1
1 University of Pennsylvania
Corresponding Authors: [email protected], [email protected]
DUNE is an experiment aimed at determining the mass hierarchy of neutrinos and measuring parity violation in the neutrino sector. The ProtoDUNE detector is a prototype Liquid Argon (LAr) TPC for the DUNE far detector and will be operated at CERN to primarily study hadronic interactions in LAr at the few GeV energy scale. Due to the operation of ProtoDUNE in a beamline near the surface, the detector will need to be able to discern between the intended beam particles and background events arising primarily from cosmics and beam byproducts such as halo muons and other contaminants. Thus, in order to reduce the data rates to manageable levels, ProtoDUNE will employ the use of triggers. The Central Trigger Board (CTB) was designed to make use of the the available information fromthe Cosmic Ray Tagger, Beam Instrumentation, and Photon Detection System to generate triggers for ProtoDUNE. The CTB itself is a custom Printed Circuit Board which houses an FPGA (XilinxZynq 7Z020), where the trigger logic is implemented in firmware, and an embedded processor running a
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Linux distribution. In this poster we discuss possible trigger schemes and their viability based on timing simulations.
Diversity, Education, and Outreach / 452
Spanish Outreach at Fermilab
Author: Minerba Betancourt1
1 Fermilab
Corresponding Author: [email protected]
Approximately 15% of the people in the United States have Hispanic origins but is estimated than less than 10% of adults in this group have completed a bachelor’s degree or more. Fermilab’s outreach program now includes in-Spanish components of ask-a-scientist and tours to various Fermilab facilities, among others. The goal of these activities is to increase the participation of the Hispanic and Latino communities in Science, Technology, Engineering and Mathematics by showcasing real examples of lab employees, as well as graduate students and postdocs from Latin American and U.S. institutions that share their heritage. Examples of the above activities will be shown.
Computing, Analysis Tools, and Data Handling / 453
Deep Learning Applications in the NOvA Experiment
Author: Fernanda Psihas1
1 Indiana University
Corresponding Author: [email protected]
Deep Convolutional Neural Networks (CNNs) have been widely applied in computer vision to solve complex problems in image recognition and analysis. In recent years many efforts have emerged to extend the use of this technology to HEP applications, including the Convolutional Visual Net- work (CVN), our implementation for identification of neutrino events. In this presentation Iwill describe the core concepts of CNNs, the details of our particular implementation in the Caffe frame- work and our application to identify NOvA events. NOvA is a long baseline neutrino experiment whose main goal is the measurement of neutrino oscillations. This relies on the accurate identifi- cation and reconstruction of the neutrino flavor in the interactions we observe. In 2016 theNOvA experiment released results for the observation of oscillations in the νµ → νe channel, the first HEP result employing CNNs. I will also discuss our approach at event identification on NOvA and DUNE as well as recent developments in the application of CNNs for particle tagging and other ongoing work.
454 Panel for Fairness in Diversity & Gender Equality Efforts
Authors: Fernanda Psihas1; Michela Paganini2
1 Indiana University 2 Yale
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Corresponding Author: [email protected]
This contribution is a discussion in panel format from members of the community on thetopicof “Overlooked Issues and Unintended Effects of Affirmative Action”. The intention of this panelisto discuss amongst members of the community, rather than experts, on topics of affirmative action and come up with a set of concerns arising from the community, as well as open a discussion of fairness beyond the labels of gender or minority. Panelists will recount experiences about issues of equal opportunity and discrimination in the field. We will engage the audience for feedback and interactively draft a document of existing concerns to encourage a next wave of statistical analyses concerning awareness of the missing pieces in our current efforts on affirmative action.
Quark and Lepton Flavor / 455
Gauge Model for Minimal Flavor Violation
Author: K.S. Babu1 Co-author: Shaikh Saad 1
1 Oklahoma State University
Corresponding Authors: [email protected], [email protected]
We present a flavor gauge model based on O(3)L ×O(3)R gauge symmetry, a maximal anomaly-free subgroup of the standard model flavor symmetry. In this model the fermion mass hierarchy hasa dynamical origin. The model provides a UV complete realization of the Minimal Flavor Violation Hypothesis. Implications for quark sector and lepton sector flavor violation arising through higher dimensional effective operators involving the Higgs field are outlined. CP violation arising from these operators is also studied. Vector-like fermions responsible for the generation of the top quark, bottom quark, and the tau lepton masses are in the TeV range, and potentially within reach ofthe LHC.
Neutrino II / 456
Energy reconstruction of NOvA neutrino events.
Author: Fernanda Psihas1 Co-author: Erica Smith 1
1 Indiana University
Corresponding Author: [email protected]
The NOvA experiment measures long baseline oscillations from muon neutrinos into electron neu- trinos in Fermilab’s NuMI beam. Measurement of this oscillation probability enables determination of the neutrino mass ordering and opens a window to observation of charge-parity violation in the neutrino sector. In 2016 the NOvA experiment released results for the observation of oscillations in the νµ → νe channel, the first HEP result employing CNNs. Future analyses will exploit theex- pected energy dependence of oscillation to improve sensitivities, together with the use of machine learning applications to improve energy estimation. I will present our methods to estimate energy for signal events, including methods based on machine learning techniques.
Poster Session and Reception / 457
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Ongoing Community Efforts in Machine Learning in Particle Physics
Authors: Fernanda Psihas1; Sergei Gleyzer2
1 Indiana University 2 University of Florida
Corresponding Authors: [email protected], [email protected]
In this poster we will highlight the different community efforts in machine learning in high-energy physics and their positive impact on the community. These efforts include the Inter-Experimental (IML) LHC Machine Learning working group, the Machine Learning group at Fermilab, aMVA4NewPhysics, INSIGHTS, Data Science at HEP workshops. Additional opportunities in the areas of education, train- ing and outreach, as well as involvement of the broader ML community would further enable the progress of machine learning in HEP.
Diversity, Education, and Outreach / 458
Better public talks…through science!
Author: Katie Yurkewicz1
1 Fermilab
Corresponding Author: [email protected]
As a physicist, you’re an expert on your chosen area of science. You’ve spent years learning the fine details, have read all the latest research in your specialty, and love sharing it with others through public lectures, talks and outreach activities. But did you know that there’s a body of research out there that can help you improve your public engagement? Have you read the latest papers on public speaking, perused the newest analyses of social media networks, or investigated recent case studies on multicultural communication? This presentation will provide an overview of recent research that is relevant to particle physics outreach activities, with a particular focus on tips, tricks and techniques to improve your public talks.
QCD / 459
Comparison of the F2 Structure Function in Iron as Measured by Charged Lepton and Neutrino Probes
Author: Cynthia Keppel1
Co-author: Eric Christy 2
1 Hampton University / Jefferson Lab 2 Hampton University
Corresponding Authors: [email protected], [email protected]
World data for the F2 structure function for Iron, as measured by multiple charged lepton and neu- trino deep inelastic scattering experiments, are compared. Data obtained from charged lepton and neutrino scattering at larger values of x are in remarkably good agreement with a simple invocation of the 18/5 rule, while a discrepancy in the behavior of the data obtained from the different probes well beyond the data uncertainties is observed in the shadowing/anti-shadowing transition region
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where the Bjorken scaling variable x is less than 0.15. The data are compared to theoretical calcula- tions. Details and results of the data comparison will be presented, along with future plans.
QCD / 460
QCD and Short-Range Correlations in Nuclei
Author: Or Hen1
1 MIT
Corresponding Author: [email protected]
The description of the nuclear interaction in terms of partonic degrees of freedom, andtheeffect of the nuclear environment on bound nucleons structure functions are two of the main outstand- ing questions in the study of QCD in nuclear systems. Recent high-energy proton and electron scattering experiments show that short-range interactions between the nucleons form correlated, high-momentum, neutron-proton pairs, known as Short-Range Correlations (SRC). These measure- ments suggest that these correlations account for 20% of the nucleons in the nucleus, and 60-70% of the kinetic energy carried by nucleons in nuclei. These short-lived SRC fluctuations present a gateway to probing cold nuclear matter athighden- sities where QCD effects are maximized and have wide ranging implications to the bound nucleon structure function, the EMC effect, the NuTeV anomaly and more, with recent phenology suggesting the existence of non-nucleonic degrees of freedom in their wave function. In this talk I will overview recent experimental studies of SRC in nuclei and recent theoretical devel- opments. I will present new (unpublished) data on SRCs at very short distances and in asymmetric, neutron rich, nuclei. Implications for various phenomena ranging from neutrino-nucleus scattering to the isospin dependence of the bound nucleon wave function will be discussed.
QCD / 461
Studies of quarkonium at Belle and Belle II
Author: Bryan Fulsom1
1 Pacific Northwest National Laboratory
Corresponding Author: [email protected]
Quarkonium is the bound state of a heavy quark and its anti-quark counterpart. The studyofthis system has experienced a renaissance thanks to results from the e+e- collider experiments, including discoveries of long-predicted conventional quarkonia, and unusual states consisting of four quarks. The Belle Experiment operated at KEK in Japan from 1999-2010. Analysis of the collected datacon- tinues to produce new findings. The Belle II experiment is a substantial upgrade of both theBelle detector and the KEKB accelerator, aiming to collect 50 times more data beginning in 2018. This talk will present recent Belle results related to hadronic and radiative decays in the bottomonium system. It will also describe the capabilities of Belle II to explore these topics, with a particular focus on the physics reach of the first data, where unique opportunities exist to make an immediate impact in this area.
QCD / 462
The energy distribution of subjets and the jet shape
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Author: Felix Ringer1
1 Lawrence Berkeley Laboratory
Corresponding Author: [email protected]
We review the treatment of inclusive jets and their substructure within Soft Collinear Effective The- ory (SCET). We present a framework that describes the energy distribution of subjets of radius r within a jet of larger radius R. We consider both an inclusive sample of subjets as well as subjets centered around a predetermined axis, from which the jet shape can be obtained. We consider both the standard jet axis and the winner-take-all axis which is a recoil-free axis. Numeri- cal results are presented for an inclusive subjet sample pp –> jet + X at next-to-leading order plus leading logarithmic order for both ln R and ln(r/R).
QCD / 463
Search for the critical point in hot QCD matter
Author: Yi Yin1
1 MIT
Corresponding Author: [email protected]
Heavy-ion collision experiments at the Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC) create QCD matter with temperatures in the trillions of degrees and provide unique opportunities to understand the phase diagram of QCD matter under extreme conditions. The critical point is one of the main features of the phase diagram of strongly interacting quark-gluon matter and locating the critical point will provide insight into the strong force that binds nuclear matter. Finding this critical point experimentally will require describing the bulk evolution of the QCD matter near the critical point and an understanding of the possible experimental signatures. In this talk, I will present recent theoretical development on attacking those challenges by knitting insights and developments from high energy physics and condensed matter physics . In particular, I will show the application of effective field theory to describe the bulk evolution of QCD matter. I will also demonstrate that the key elements of the Kibble-Zurek framework, which was initially developed in the context of cosmology, can be employed to identify the patterns of experimental signature of the QCD critical point.
Cosmology and Astrophysics / 465
News from BICEP/Keck Array CMB program
Author: Zeeshan Ahmed1
1 SLAC National Accelerator Laboratory
Corresponding Author: [email protected]
The BICEP/Keck Array program comprises a series of telescopes at the South Pole designed tomake deep measurements of cosmic microwave background polarization at degree angular scales on a 1% patch of sky. This talk will describe the latest science results from the program, including constraints on inflation, axion-like particles and primordial magnetic fields, as well as a high-significance detec- tion of gravitational lensing. These results were derived using various combinations of 150GHz and 95GHz data collected by the BICEP/Keck receivers through 2014, and multi-frequency data from Planck and WMAP. The talk will also preview imminent science results that include oneyearof
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220GHz data from BICEP/Keck. Finally, we will share plans for BICEP Array, the Stage 3 expansion of the BICEP/Keck program.
Particle Detectors / 466
The LHCb Upgrades
Author: Marco Gersabeck1
1 The University of Manchester
Corresponding Author: [email protected]
During the LHC Run-1 the LHCb experiment has successfully performed a large number of world’s class precision measurements in heavy flavour physics, and is now further increasing the datasets in Run-2. However, most of the LHCb measurements will remain limited by statistics. LHCb will therefore undergo a major upgrade in the Long Shutdown 2 (LS2) of LHC aimed at collecting an order of magnitude more data during Run-3 and Run-4. The upgrade consists of a new full readout at the LHC bunch crossing rate (40 MHz) with the ultimate flexibility of a pure software trigger. In order to increase the instantaneous luminosity up to 2x10ˆ33 cm-2s-1, several sub-detector upgrades are also underway, in order to cope with the expected higher occupancies and radiation dose. The architecture of the upgraded detector will be presented along with physics goals. Furthermore, the LHCb collaboration is planning a further upgrade to be installed during LS4 that aims at raising the instantaneous luminosity by another factor 10, in order to collect order of 300 fb-1 by the end of the Run-5. Conceptual design and physics reach will be also discussed.
Particle Detectors / 467
A Novel Readout System for a High Efficiency Cosmic Ray Veto for the Mu2e Experiment
Author: Sten Hansen1
1 Fermilab
Corresponding Authors: [email protected], [email protected]
The Mu2e Cosmic Ray Veto system must veto cosmic-ray muons over an area of about 300m2with an overall efficiency of 99.99% in the presence of high background rates from beam-induced neu- trons and gammas. It consists of 5,504 long extruded scintillator extrusions with embedded 1.4 mm wavelength shifting fibers read out by 2×2 mm2 sil- icon photomultiplier (SiPM) diodes. Ahigh-rate, robust, custom de- signed electronics readout system has been designed and tested to power and read out the signals from the SiPMs. It consists of: (1) small cir- cuit board, the Counter Mother Board, situated on the ends of the scintillator counters, and which provides a bias distribution network, a temperature sensor, flasher LEDs, and passive SiPM pulse shaping; (2) a Front End Board which dig- itizes in time and amplitude, and stores in on-board memory signals from up to 64 Counter Mother Boards, as well as providing bias to the SiPMs, pulses to the LEDs, and measur- ing SiPM currents; and (3) a Readout Controller which collects zero- suppressed data from the Front End Boards via Category 6 Ethernet cables which also deliver 48V power to the Front End Boards using the power over Ethernet standard. The data collected in the controllers is formatted appropriately andtrans- mitted over 3.125 Gb/s optical fibers to custom circuit boards that interface with a computerfarm used for triggering and data acquisition. The vetoing of background events is done in the offline analysis. The use of commercial hardware has kept costs and development time down. Test results of the performance of a prototype system will be reported.
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Neutrino Physics / 469
Current Status and Commissioning of the SNO+ Experiment
Author: Christopher Grant1
1 Boston University
Corresponding Author: [email protected]
The SNO+ experiment will use a 780-ton liquid scintillator detector, loaded with 1.3 tons of130Te, to search for neutrino-less double beta decay (0nbb). The detector has reached a major milestone after filling the detector with ultra-pure water in early 2017. Initial data-taking with a water-filled detector will continue through liquid scintillator filling in the fall of 2017. This talk will give abrief overview of the commissioning of the SNO+ detector and the physics goals leading up to 130Te loading. The predicted backgrounds and sensitivities to 0nbb will also be presented.
Poster Session and Reception / 470
Silicon and Germanium Ionization Yield Measurements with Neu- tron Beams
Author: Ziqing Hong1
1 Northwestern University
Corresponding Author: [email protected]
SuperCDMS SNOLab is using low energy threshold Si/Ge detectors for dark matter direct searches. One mode of operation for the experiment runs detectors ina high-voltage-biased mode, to use Neganov-Luke Amplification. Understanding the ionization yield of low-energy nuclear recoils is essential for interpreting dark matter search data taken in this mode. We present two calibration experiments designed to measure the ionization yield with the CDMS-style detectors in monoenergetic neutron beams. One experiment is performed with an Adiabatic-Demagnetization Refrigerator at the TUNL facility, and the other one with a Dilution Refrigerator in the NEXUS@FNAL facility with a DD neutron generator. In this poster, we show the experimental setups and simulation results of this calibration program.
Dark Matter / 471
Light Dark matter eXperiment
Author: Philip Schuster1
1 SLAC
Corresponding Authors: [email protected], [email protected]
The Light Dark Matter eXperiment (LDMX) proposes a high-statistics search for dark matterin fixed-target electron-nucleus collisions, ultimately exploring thermal relic dark matter overmost of the viable sub-GeV mass range to a decisive level of sensitivity. To achieve this goal, LDMX employs the missing momentum technique, where electrons scattering in a thin target can produce dark matter via “dark bremsstrahlung” giving rise to significant missing momentum andenergyin the detector. To identify these rare signal events, LDMX individually tags incoming beam-energy
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electrons, unambiguously associates them with low energy, moderate transverse-momentum recoils of the incoming electron, and establishes the absence of any additional forward-recoiling charged particles or neutral hadrons. LDMX will employ low mass tracking to tag incoming beam-energy electrons with high purity and cleanly reconstruct recoils. A high-speed, granular calorimeter with MIP sensitivity is used to reject the high rate of bremsstrahlung background at trigger level while working in tandem with a hadronic calorimeter to veto rare photo nuclear reactions. This talk will summarize the small-scale detector concept for LDMX, ongoing performance studies, and near future prospects.
Accelerators / 472
Fermilab PIP-II Status and Strategy
Author: Shekhar Mishra1
1 Fermilab
Corresponding Author: [email protected]
Proton Improvement Plan-II (PIP-II) is the centerpiece of Fermilab’s plan for upgrading the accel- erator complex to establish the leading facility in the world for particle physics research based on intense proton beams. PIP-II has been developed to provide 1.2 MW of proton beam power at the start of operations of the Long Baseline Neutrino Experiment (LBNE), while simultaneously provid- ing a platform for eventual extension of LBNE beam power to >2 MW and enabling future initiatives in rare processes research based on high duty factor/higher beam power operations. PIP-II is based on the construction of a new, 800 MeV, superconducting linac, augmented by improvements to the existing Booster, Recycler, and Main Injector complex. PIP-II is currently in the development stage with an R&D program underway targeting the front end and superconducting rf acceleration tech- nologies. This paper will describe the status of the PIP-II conceptual development, the associated technology R&D programs, and the strategy for project implementation.
Quark and Lepton Flavor / 473
Z’ Models for B Anomalies at the LHC
Author: Bhaskar Dutta1
1 Texas A&M University
Corresponding Author: [email protected]
Abstract: Recently reported R(K) and R(K*) anomalies by the LHCb experiment have prompted in- vestigations for new physics models with flavor changing new extra gauge Boson, Z’. The Z’, inthese models, only needs to couple with b, mu and s in order to explain the B-anomalies. We investigate these Z’s at the LHC utilizing b-fusions (arising from gluon splitting) with leptonic final state in the association of 2b and 1b jets. We find that, utilizing this unique final state, the LHC canprobe interesting regions of parameter space of these models which explain the anomalies after satisfying the constraints arising from various flavor constraints and current LHC searches.
Particle Detectors / 474
3D Diamond Sensor Development
Author: William Trischuk1
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1 University of Toronto
Corresponding Author: [email protected]
At present most experiments at the CERN Large Hadron Collider (LHC) are planning upgrades in the next 5-10 years for their innermost tracking layers as well as luminosity monitors to be able to take data as the luminosity increases and CERN moves toward the High Luminosity-LHC (HL-LHC). These upgrades will most likely require more radiation tolerant technologies than exist today.As a result this is one area of intense research. Chemical Vapour Deposition (CVD) diamond has been used extensively and successfully in beam conditions/beam loss monitors as the innermost detectors in the highest radiation areas of essentially all LHC experiments. The startup of the LHC in 2015 brought a new milestone where the first diamond pixel modules were installed in an LHC experiment (ATLAS) and successfully began taking data. As a result, this material is now being discussed as a possible sensor material for tracking very close to the interaction region and for pixelated beam conditions/beam loss monitors of the LHC/HL-LHC upgrades where the most extreme radiation conditions will exist. The RD42 collaboration at CERN is leading the effort to use CVD diamond as a material fortracking detectors operating in extreme radiation environments. During the last three years the RD42 group has succeeded in producing and measuring a number of devices to address specific issues related to use at the HL-LHC. We will present the latest results on material development, the most recent results on the independence of signal size on incident particle rate in poly-crystalline CVD diamond pad and pixel detectors over a range of particle fluxes up to 20 MHz/cmˆ2 measured. In addition wehave been working on a novel detector using chemical vapour deposited (CVD) diamond and resistive electrodes in the bulk forming a 3D diamond device. Detector systems consisting of 3D devices, one based on single-crystal CVD diamond and one based on poly-crystalline CVD diamond were connected to a multi-channel readout and successfully tested in a 120 GeV proton beam at CERN proving for the feasibility of the 3D diamond detector concept for particle tracking applications. Recently the first 3D diamond pixel detector was constructed. This fabrication process of thisdevice will be presented along with the first beam test results.
Particle Detectors / 475
Overview of the CEPC Vertex Detector
Author: Hongbo Zhu1
1 Institute of High Energy Physics
Corresponding Author: [email protected]
he Circular Electron Positron Collider (CEPC) has been proposed to measure with unprecedented precision the Higgs properties as well as the electroweak parameters. Its vertex detector that will be located as close as possible to the interaction point, must be built with state-of-the-art pixel detector technologies. In the presentation, performance requirements including single point resolution, read- out time, and radiation hardness against total ionization dose (TID) and non-ionization energy loss (NIEL) will be explained. Potential candidate technologies and their R&D progress will be discussed together with the detector layout optimization. In addition, a preliminary design of the complicated interaction, which has dramatical impacts on the vertex detector will be also presented
476 Plans for Ultra-intese beams at FACET-II and experiments to probe High
Author: vitaly yakimenko1
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1 slac
Corresponding Author: [email protected]
FACET-II (Facility for Advanced Accelerator Experimental Tests) will be a unique R&D facility for experimental beam physics using one kilometer of the SLAC linac. It is a follow-on facility to continue the research programs carried out at FFTB and FACET. While operating as a National User Facility, FACET simultaneously executed a multi-year program to help assess Plasma Wakefield Acceleration (PWFA) as a technology for future accelerators. FACET-II will provide a major upgrade over FACET capabilities and support a much broader research program. The FACET-II beam can also enable research where extremely strong fields are generated by tightly compressed electron beams. An individual bunch of electrons at FACET-II will have 35 joules of stored energy with possibility to be compressed to ˜2fs duration and focused to ˜100nm transversely – while operating at 30Hz. For a several research directions, this is similar to a 10PW laser beam reaching a peak intensity of 4.1025 W/cm2. The differences between the interactions of FACET-II’s intense electron bunches and 10PW laser beam open exciting opportunities for complementary research.
477 Laser-plasma-based linear collider using hollow plasma channels
Author: Carl Schroeder1
1 Lawrence Berkeley National Laboratory
Corresponding Author: [email protected]
A linear electron–positron collider based on laser-plasma accelerators using hollow plasma channels is considered. Laser propagation and energy depletion in the hollow channel is discussed, as well as the overall efficiency of the laser-plasma accelerator. Example parameters are presented for a 1-TeV and 3-TeV center-of-mass collider based on laser-plasma accelerators.
Particle Detectors / 478
Upgrade of the ATLAS Muon Spectrometer for Phase II
Author: Thomas Schwarz1
1 Fermilab
Corresponding Author: [email protected]
The HL-LHC upgraded of the LHC will be installed in the 2.5 year long shutdown, scheduled tostart in 2024. Following this upgrade, the ATLAS and CMS experiments expect to collect 3,000 fb-1 each, which represent 90% of the total integrated luminosity obtained in the lifetime of the experiments. The detection of muons with precision and high efficiency is critical to the high luminosity physics scope of both experiments. This talk will cover the upgrade of the ATLAS muon spectrometer and the associated physics and performance motivation for the components of the upgrade.
Computing, Analysis Tools, and Data Handling / 479
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The ATLAS Trigger Menu design for higher luminosities inRun 2 (TDAQ)
Author: Evelyn Thomson1
1 University of Pennsylvania
Corresponding Author: [email protected]
The ATLAS experiment aims at recording about 1 kHz of physics collisions, starting with an LHC design bunch crossing rate of 40 MHz. To reduce the large background rate while maintaining a high selection efficiency for rare physics events (such as beyond the Standard Model physics), a two-level trigger system is used. Events are selected based on physics signatures such as the presence of energetic leptons, photons, jets or large missing energy. The trigger system exploits topological information, as well as multivariate methods to carry out the necessary physics filtering for the many analyses that are pursued by the ATLAS community. In total, the ATLAS online selection consists of nearly two thousand individual triggers. A Trigger Menu is the compilation of these triggers, it specifies the physics selection algorithms to be used during data taking and the rate and bandwidth a given trigger is allocated. Trigger menus must reflect the physics goals of the collaboration for a given run, but also take into consideration the instantaneous luminosity of the LHC and limitations from the ATLAS detector readout and offline processing farm. For the 2017 run, the ATLAS trigger has been enhanced to be able to handle higher instantaneous luminosities (up to 2.0x10ˆ{34}cmˆ{-2}sˆ{-1}) and to ensure the selection robustness against higher average multiple interactions per bunch crossing. In this presentation we describe the design criteria for the trigger menu for Run 2. We discuss several aspects of the process of planning the trigger menu, starting from how ATLAS physics goals and the need for detector performance measurements enter the menu design, and how rate, bandwidth, and CPU constraints are folded in during the compilation of the menu. We present the tools that allow us to predict and optimize the trigger rates and CPU consumption for the anticipated LHC luminosities. We outline the online system that we implemented to monitor deviations from the individual trigger target rates and to quickly react to changing LHC conditions and data taking scenarios. Finally we give a glimpse of the 2017 Trigger Menu, allowing the listener to get a taste of the vast physics program that the trigger is supporting.
Computing, Analysis Tools, and Data Handling / 480
The ATLAS Trigger algorithms upgrade and performance in Run 2 (TDAQ)
Author: Evelyn Thomson1
1 University of Pennsylvania
Corresponding Author: [email protected]
The ATLAS trigger has been used very successfully for the online event selection during the first part of the second LHC run (Run-2) in 2015/16 at a center-of-mass energy of 13 TeV. The trigger system is composed of a hardware Level-1 trigger and a software-based high-level trigger; it
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reduces the event rate from the bunch-crossing rate of 40 MHz to an average recording rate of about 1 kHz. The excellent performance of the ATLAS trigger has been vital for the ATLAS physics program of Run-2, selecting interesting collision events for wide variety of physics signatures with high efficiency. The trigger selection capabilities of ATLAS during Run-2 have been significantly improved compared to Run-1, in order to cope withthe higher event rates and pile-up which are the result of the almost doubling of the center-of-mass collision energy and the increase in the instantaneous luminosity of the LHC. At the Level-1 trigger the undertaken improvements resulted in more pile-up robust selection efficiencies and event rates and in a reduction of fake candidate particles. A new hardware system, designed to analyze event-topologies, supports a more refined event selection at the Level-1. A hardware-based high-rate track reconstruction, currently being commissioned, enables the software trigger to make use of tracking information at thefull input rate. Together with a re-design of the high-level trigger to deploy more offline-like reconstruction techniques, these changes improve the performance of the trigger selection turn-on and efficiency to nearly that of the offline reconstruction. In order to prepare for the anticipated further luminosity increase of the LHC in 2017/18, improving the trigger performance remains an ongoing endeavor. Thereby coping with the large number of pile-up events is one of the most prominent challenges. This presentation gives a short review the ATLAS trigger system and its performance in 2015/16 before describing the significant improvements in selection sensitivity and pile-up robustness, which we implemented in preparation for the expected highest ever luminosities of the 2017/18 LHC.
Poster Session and Reception / 481
A uniform magnetic field generator system and a Cu hybrid cos- mic ray detector of 4 channels
Authors: Francisco Rosas-Torres1; Julian Felix1; Karla Natalia Herrera Guzman1; Raul Alejandro Gutierrez Sanchez1
1 Universidad de Guanajuato
Corresponding Authors: [email protected], [email protected], [email protected], gutier- [email protected]
In the universe, there are several sources that produce very energetic cosmic rays that interact with the Earth’s atmosphere and create new low energy particles. These particles can be electrically charged and neutral. There are different methods to detect them, according to its interaction with a medium such as the ionization of a material and Cerenkov radiation, among others. An obtained signal can be validated with another detection method, as in a Cu hybrid detector, or with a specific array of detectors. Knowing some points where a particle has passed through, inside a magnetic field, its trajectory and electric charge can be determined. This work presents the design, construction and characterization of a uniform magnetic fieldgener- ator system and a Cu hybrid cosmic ray detector of 4 channels. Details and some preliminary results will be presented.
482 Theory talk on Higgs
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483 Theory ttH
Poster Session and Reception / 484
Effects of Magnetic Horn Geometry Uncertainty on Neutrino Flux at DUNE
Author: Amador Eric1
1 University of Texas Arlington
Corresponding Author: [email protected]
The goals of the Deep Underground Neutrino Experiment (DUNE) at Fermi Lab,isto precisely measure neutrino and antineutrino oscillation properties to determine if charge-parity (CP) symmetry is violated in the lepton sector, thus providing a possible explanation for the matter-antimatter asymmetry in the universe, and to measure the neutrino mass ordering. To maximize the neutrino flux in the desired energy range, the secondary charged mesons produced in the interactions of an intense proton beam with a target are focused using the magnetic field created by a set of horns. To ensure an accurate understanding of the beam line and the neutrino flux, it is essential o study uncertainties stemming from the geometry to these horns. In this study, two geometric parameters are considered, (i) the eccentricity and (ii) the ellipticity of the inner conductors. The effects of eccentricity and ellipticity of the inner conductor tothe resulting neutrino flux are presented.
Poster Session and Reception / 485
A particle hypothesis based approach for energy estimation in muon neutrino charged current events at NOvA
Author: Erica Smith1
Co-authors: Fernanda Psihas 1; Michael Baird 2
1 Indiana University 2 University of Sussex
Corresponding Author: [email protected]
NOvA is a neutrino oscillation experiment which probes the neutrino CP-violating phase and mass ordering, as well as improve limits on current neutrino oscillation parameters, by measuring oscilla- tions of muon neutrinos and muon anti-neutrinos produced in the NuMI beam at Fermilab. The muon 2 2 neutrino disappearance analysis specifically focuses on the measurements of ∆m32 and sin (θ23). Choosing the right energy estimator is key to oscillation analyses; the estimator currently used by the muon neutrino disappearance analysis identifies the muon in an event, and labels all other energy depositions as hadronic energy. However, it is possible to use a version of NOvA’s convolutional visual network (CVN) to separate the hadronic energy into its individual components. Once the particle is identified using CVN, we measure the energy of these tracks with a method called “Break Point Fitting” developed to track a scattering particle passing through a detector that takes measure- ments at discrete intervals. The track is fit under three assumptions: muons, protons, and pions, and the energy is calculated for each. The combination of tagging particles with CVN and more accurate energy calculation with BPF will allow for a more robust energy estimator, with a possibility for an improved energy resolution.
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Quark and Lepton Flavor / 486
CP violation measurements in b hadrons at LHCb
Author: Marco Gersabeck1
1 The University of Manchester
Corresponding Author: [email protected]
LHCb has been collecting the world’s largest sample of beauty hadrons available to date. This sample has been used to measure different sources of CP violation and search for beyond-the-standard- model physics. We present a selection of measurements performed by LHCb using the full Run 1 dataset and in some cases part of the Run-2 dataset, notably including: the measurements of the semileptonic asymmetries, Asls and Asld; the measurements of the CP-violating phase phi_s using Bs->J/psi KK (including KK masses above the phi resonance) and Bs->J/psi pipi decays, and that of the phase phi_d using Bd->J/psi KS decays; the measurement of the gamma angle of unitarity triangle via a number of decay modes; the measurement of CP violation in two-body B decays; and the search for CP violation using b-baryon decays. An outlook of upcoming measurements will also be given
Poster Session and Reception / 487
Studies of effect of aging and studies to optimize scintillation counter response for the Mu2e Cosmic Ray Veto System
Authors: Pedrom Zadeh1; Peter Farris1
1 University of Virginia
Corresponding Authors: [email protected], [email protected]
The Mu2e experiment will conduct a search for charged lepton flavor violation through observation of a neutrino-less muon-to-electron conversion. In order to reduce backgrounds from cosmic ray muons, a cosmic ray veto consisting of counters made from scintillating plastic will be read out by wavelength-shifting fibers. The cosmic ray veto must have an overall detection efficiency of99.99%. In order to meet this requirement, the light yield must be optimized and well understood. The counters are designed to meet photoelectron yield requirements over a working lifetime of 10 years. Aging studies are measuring the temporal response of the light yield of the scintillator and transmis- sion of light through optical fibers. An oven has been used to heat samples to simulate an advanced aging process. Tests include measuring the attenuation of light through the aged optical fiber using an LED flasher with a photodiode or spectrometer and measuring the response of aged counters to radioactive sources and cosmic rays. We will describe the affect from aging on the counter and fiber response as well as several measurements aimed at improving the light yield, including the investigation of different reflectors at the far end of counters with single-ended readout.
Beyond Standard Model / 488
The MoEDAL Experiment at the LHC - a new light on theHigh Energy Frontier
Author: Arttu Rajantie1
1 Imperial College London
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Corresponding Author: [email protected]
MoEDAL is a pioneering experiment designed to search for highly ionising messengers of new physics such as magnetic monopoles or massive (pseudo-)stable charged particles, that are predicted to existing a plethora of models beyond the Standard Model. It started data taking at the LHC at a centre-of-mass energy of 13 TeV, in 2015. Its ground breaking physics program defines a num- ber of scenarios that yield potentially revolutionary insights into such foundational questions as: are there extra dimensions or new symmetries; what is the mechanism for the generation of mass; does magnetic charge exist; and what is the nature of dark matter. MoEDAL purpose is to meet such far-reaching challenges at the frontier of the field. We will present the first results from the MoEDAL detector on Magnetic Monopole production that are the world’s best for Monopoles with multiple magnetic charge. In conclusion, plans to install a new MoEDAL sub-detector designed to search for very long-lived neutral particles as well as mini-charged particles will be very briefly discussed.
Diversity, Education, and Outreach / 489
Panel and Discussion
Diversity, Education, and Outreach / 490
Panel and discussion
Diversity, Education, and Outreach / 491
Panel on Equity, Diversity and Inclusivity in Science Culture
Precision Electroweak Physics / 492
Measurement of the effective weak mixing angle in dimuon events at D0 and combination of the weak mixing angle measurements and W mass extraction at the Tevatron
Author: Breese Quinn1
1 University of Mississippi
Corresponding Author: [email protected]
We present the measurement of forward-backward charge asymmetry AFB in pp̄ → Z/γ∗ → μ+μ− events using 9.7 fb−1 of̄ pp data collected at sqrt s = 1.96 TeV by the D0 detector at the Fermilab Teva- tron collider. AFB is measured as a function of the invariant mass of the dilepton system to extract the effective weak mixing angle sin2θeff. We discuss the combination of the four measurements of AFB in pp̄ → Z/γ∗ → e+e− /μ+μ− + X events using the full datasets collected by the D0 and CDF detectors at the Tevatron and present the indirect extraction of the W mass in the context of the standard model.
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Plenary / 493
Welocme from DPF
Corresponding Author: [email protected]
Plenary / 494
Welcome from Fermilab
Corresponding Author: [email protected]
Plenary / 495
Properties of the Higgs boson
Corresponding Author: [email protected]
Plenary / 496
Searches for new physics at the energy frontier
Corresponding Author: [email protected]
Plenary / 497
Physics at the future colliders
Corresponding Author: [email protected]
Plenary / 498
WIMP dark matter searches progress and plans
Corresponding Author: [email protected]
Plenary / 499
Progress and new ideas in non-WIPM dark matter searches
Corresponding Author: [email protected]
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Plenary / 500
APS Fellows award ceremony
Corresponding Author: [email protected]
Plenary / 501
CERN program and plans for the European Strategy
Corresponding Author: [email protected]
Plenary / 502
Next European strategy process
Corresponding Author: [email protected]
Plenary / 503
Asia particle physics program
Corresponding Author: [email protected]
Plenary / 504
US Particle Physics Program
Corresponding Author: [email protected]
Plenary / 505
DOE High Energy Physics Program and funding opportunities
Corresponding Author: [email protected]
Plenary / 506
NSF Particle Physics Program
Corresponding Author: [email protected]
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Plenary / 507
New developments in the relation between quantum gravity and quantum information
Corresponding Author: [email protected]
Plenary / 508
Developments in the theory of flavor mixing and new develop- ments in FCNC decays
Plenary / 509
New experimental results and prospects on flavor physics
Corresponding Author: [email protected]
Plenary / 510
Properties of the top quark and electroweak measurements
Corresponding Author: [email protected]
Plenary / 511
Diversity and Inclusion
Corresponding Author: [email protected]
Plenary / 512
Neutrino oscillations review
Corresponding Author: [email protected]
Plenary / 513
Neutrino interactions – experimental and theoretical developments
Page 178 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Corresponding Author: [email protected]
Plenary / 514
Neutrino mass and double beta decay
Corresponding Author: [email protected]
Plenary / 515
How all neutrino measurements results fit together
Corresponding Author: [email protected]
Plenary / 516
QCD studies at high and low energies
Corresponding Author: [email protected]
Plenary / 517
Hot and cold QCD matter
Corresponding Author: [email protected]
Plenary / 518
QCD theory developments
Corresponding Author: [email protected]
Plenary / 519
“Dark sectors” and other novel types of new particles
Corresponding Author: [email protected]
Plenary / 520
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New models of elementary and composite Higgs bosons
Plenary / 521
Cosmic Microwave Background
Corresponding Author: [email protected]
Plenary / 522
Dark Energy Survey Year 1 Results
Corresponding Author: [email protected]
Plenary / 523
DPF instrumentation award
Corresponding Author: [email protected]
Plenary / 524
DPF mentoring award
Corresponding Author: [email protected]
Plenary / 525
DPF Tanaka thesis award talk
Corresponding Author: [email protected]
Plenary / 526
DPF Sakurai thesis award talk
Corresponding Author: [email protected]
Plenary / 527
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Education and Outreach
Corresponding Author: [email protected]
Plenary / 528
Developments in accelerators for future high energy machines
Corresponding Author: [email protected]
Plenary / 529
Future directions in particle physics software and computing
Corresponding Author: [email protected]
Plenary / 530
Particle detectors developments
Corresponding Author: [email protected]
Plenary / 531
Concluding remarks
Corresponding Author: [email protected]
Computing, Analysis Tools, and Data Handling / 532
The ATLAS New Small Wheel Trigger
Author: Alexander Tuna1
1 Harvard University
Corresponding Author: [email protected]
The New Small Wheel (NSW) is a major upgrade to the muon spectrometer of the ATLAS experiment, which will be installed in 2019-2020. The NSW will comprise both sTGC and Micromegas detectors. One of the major goals on the upgrade is fast, precise muon reconstruction in hardware to allow triggering on single muon events in high pileup environments. This talk presents the status of the NSW trigger and integration into the NSW electronics readout path, with emphasis on the test stand at Harvard
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taking cosmic ray muon data with an octuplet of prototype Micromegas chambers.
Higgs and EWSB / 533
Higgs-boson physics at the LHC: from discovery to precision physics.
Author: Laura Reina1
1 Florida State University
Corresponding Author: [email protected]
The LHC Higgs-boson physics programme is broad and challenging. The progress of experimental analyses has been matched by an unprecedented theoretical effort to describe both production and decay properties of the Standard-Model Higgs boson. In most cases the measurement of Higgs production and properties is not limited these days by theoretical systematic, but cases still exist where this is the case. In these cases, further effort to reach a more satisfactory theoretical accuracy will have to be matched by a dedicated program of experimental measurements. In this talk I will review the interplay between theory and experiments in defining a Higgs precision-physics program, and I will discuss how, when combined with global electroweak precision fits, this can be used to constrain extensions ofthe Standard Model.
Lunch / 534
DOE PIs Meeting: HEP Civics
Corresponding Author: [email protected]
Poster Session and Reception / 535
R&D Toward Ton-Scale HPGXe Neutrinoless Double Beta Decay Experiments
Author: Leslie Rogers1
1 University of Texas in Arlington
Corresponding Author: [email protected]
The NEXT collaboration is developing a sequence of high pressure xenon gas time projection cham- bers with the aim of creating a ton-scale, very low background neutrinoless double beta decay search. While most aspects of this technology are easily scalable, some detector elements require R&D in order to be realized on a large scale. This poster will describe a new, large-scale test facility under development at the University of Texas at Arlington, which will be used to test electroluminescent gain regions, high voltage feed-throughs and field cage elements for 100kg- and ton-scale xenon gas experiments.
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Beyond Standard Model / 536
Broader Use of Simplified Limits on Resonances at the LHC
Author: Elizabeth Simmons1
1 Michigan State University
Corresponding Author: [email protected]
When an excess appears in LHC data, we should compare the results with broad classes of models, to get an immediate sense of which kinds of BSM theories could conceivably be relevant. Often, the new physics is likely to be an s-channel resonance. In this case, a simplified model of the resonance can translate an estimated signal cross section into bounds on the product of the dominant production and decay branching ratios. This quickly reveals whether a given class of models could possibly produce a signal of the required size at the LHC. This talk will outline a general framework and show how it operates for resonances of varying widths and with different numbers of production and decay modes. It will also discuss applications to cases of experimental interest, including resonances decaying to di-bosons, di-leptons, or di-jets. If the LHC experiments start reporting searches for BSM resonances in terms of the simplified limits variable ζ defined here, the community will homeinmore quickly on the models most likely to explain any observed excess.
Particle Detectors / 537
Development of fast timing detectors at Fermilab
Author: Anatoly Ronzhin1
1 Fermi National Accelerator Laboratory
Corresponding Author: [email protected]
Results of development of fast timing detectors at Fermilab presented. The detectors are based on dif- ferent type of radiators (scintillators, quartz, crystals) and photodetectors (PMT, MCP-PMT, SiPMs) detecting the light converted in charge. Part of detectors based on silicon registration the charge produced by particle. Detectors are tested at FTBF. The obtained time resolution (TR) for some of detectors is less of 10 picoseconds. The results show the detectors could be used for CMS upgrade, HEP experiments and medical research.
Meetings with DOE Representatives / 538
HEP Civics
Corresponding Author: [email protected]
Meetings with DOE Representatives / 539
Intensity Frontier
Corresponding Author: [email protected]
Page 183 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
Meetings with DOE Representatives / 540
Energy Frontier
Corresponding Author: [email protected]
Meetings with DOE Representatives / 541
Cosmic Frontier
Corresponding Author: [email protected]
QCD / 542
QCD backgrounds to dark matter searches at the LHC
Author: Kristian Hahn1
1 Northwestern Univ.
Corresponding Author: [email protected]
The sensitivities of Dark Matter (DM) searches at the LHC are rapidly becoming systematics limited. These searches must begin to leverage new methods for controlling systematic uncertainties inorder to fully exploit the 300 fb-1 anticipated in Run-2. The most crucial and challenging uncertainties to control are associated with standard model backgrounds, such as Z(νν¯) + jets, that give rise to significant missing energy (MET) at large rate. In this talk I will review how such backgrounds are treated in present-day DM searches at the LHC. I will then discuss new techniques that promise to substantially reduce large-MET background uncertainties by means of precise QCD and electroweak calculations
Panel Discussion / 543
Toward Next Snowmass
Corresponding Author: [email protected]
Beyond Standard Model / 545
Looking Forward to Dark Photons at the LHC
Author: Felix Kling1
1 Arizona / Fermilab
Corresponding Author: [email protected]
New physics has traditionally be sought in the high transverse momentum region at high-energy collider experiments. We show that, if the new physics is light and weakly-coupled, the very forward
Page 184 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
region also provides a promising location for new particle searches. Given an integrated luminosity of 300 fb−1, 1016 light mesons are produced at ATLAS and CMS within 1 mrad of the beamline, and even extremely weakly-coupled light particles may be produced in significant numbers in these meson decays. As a concrete example, we consider dark photons with mass mA′ ∼ MeV-GeV and kinetic mixing parameter ϵ. Such dark photons may be produced in π0 and η decays, pass through a couple houndred meters of matter without interacting, and then decay to and electron-positron pair. We propose a new detector, ForwArd Long-lived dArk PHoton Experiment at the Lhc (FALAPHEL), placed roughly 100 to 400 meters downstream from the ATLAS or CMS interaction point and just off the beamline in the very forward region. We find that dark photons can be discovered in a significant −6 −4 region of dark photon parameter space with mA′ ∼10-400 MeV and ϵ ∼ 10 − 10 .
Plenary / 546
Recent Developments in Lattice QCD
Corresponding Author: [email protected]
Plenary / 547
Introduction
Corresponding Author: [email protected]
Quark and Lepton Flavor / 548
Hadronic contributions to muon g-2 from lattice QCD
Author: Ruth Van de Water1
1 Fermilab
Corresponding Author: [email protected]
The Muon g-2 Experiment that just commenced running at Fermilab intends to probe the present3- sigma tension between theory and experiment by reducing the experimental uncertainty by a factor of four. In order, however, to determine definitively whether any future observed deviation isdue to new physics, the Standard-Model theory error must be brought to the same level of precision. Lattice QCD provides the only first-principles approach for calculating the hadronic contributions to the muon g-2, which are the dominant sources of error in the Standard-Model value. I review recent progress on lattice-QCD calculations of the hadronic contributions to the muon g-2, andalso discuss future plans and prospects for reducing the theory error to the level of the Muon g-2 and planned J-PARC experiments.
Plenary / 549
New T2K Neutrino Oscillation Results
Corresponding Author: [email protected]
Page 185 2017 Meeting of the APS Division of Particles and Fields (DPF 2017) / Book of Abstracts
In summer 2016, T2K reported the measurements of neutrino oscillation parameters based on the data corresponding to 7.5x10ˆ20 protons-on-target (POT) for each of the “neutrino-mode” beam run and the “antineutrino-mode” beam run. One of the highlights then was an indication of a potential violation of the CP symmetry in neutrinos at 90% CL. Since then, the experiment has accumulated additional data (7.2x10ˆ20 POT), almost doubling the statistics in neutrino-mode. In addition, ap- proximately a 30% effective increase in statistics was achieved by improvements to the event recon- struction and selection at Super-Kamiokande, the T2K far detector. In this very brief talk, we will present the highlights of the neutrino oscillation measurements with all of the data collected up to now and with the new event reconstruction and selection.
Plenary / 550
Results from COHERENT
Corresponding Author: [email protected]
Plenary / 551
Recent highlights from neutrino theory
Corresponding Author: [email protected]
In this talk I will review the recent developments in neutrino theory. Some emphasis will be given to beyond standard model physics in the neutrino sector, both in the model building and phenomenol- ogy fronts.
Poster Session and Reception / 552
Site characterization for ground-based CMB observations with a 183GHz radiometer
Author: Nicole Larsen1
1 U. Chicago, KICP
Corresponding Author: [email protected]
The cosmic microwave background (CMB) is a rich source of information about the cosmos.Over the past ten years, gains in experimental sensitivity have enabled ground-based instruments to begin the search for B-mode polarization in the CMB as a test of the inflationary paradigm. However, the atmosphere is not fully transparent in the 35-270GHz region targeted by these observations. Poorly- mixed and rapidly-varying water vapor in the atmosphere presents a challenging source of sky noise for CMB telescopes. Ground-based experiments minimize atmospheric perturbations by selecting dry, high-altitude sites where the amount of precipitable water vapor (PWV) in the atmosphere is as low and as stable as possible. The leading sites in use for present experiments are the South Pole and Chajnantor Plateau, Chile. The next-generation CMB-S4 experiment will make use of these two locations but is also turning an eye to potential sites in the northern hemisphere with the goal of increasing the observed sky fraction. To better understand the effects of PWV on current and future CMB experiments, we haveunder- taken the first coordinated measurement of atmospheric water vapor fluctuations with hightime
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resolution over long time scales at sites around the world. We use the Dicke-switched 183GHz wa- ter vapor radiometer (WVR) initially commissioned for the Atacama Large Millimeter/submillimeter Array (ALMA) and built by Omnisys Instruments AB, with the addition of custom azimuth/elevation scanning optics and a temperature-controlled environmental enclosure. Two identical units are cur- rently deployed at the South Pole and Summit Station, Greenland. We report here on the perfor- mance and measurements from these WVRs, and we discuss how these atmospheric measurements might drive site selection and design choices for future telescopes.
Meetings with DOE Representatives / 553
Detector R&D
Corresponding Author: [email protected]
Plenary / 554
DPF Instrumentation award
Corresponding Author: [email protected]
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