CIPANP 2018 - Thirteenth Conference on the Intersections of Particle and Nuclear Physics
Monday 28 May 2018 - Sunday 03 June 2018 Hyatt Regency Indian Wells Conference Center
Book of Abstracts
Contents
Opening 0 ...... 1
New Results from the Dark Energy Survey and the South Pole Telescope 219 ...... 1
Theories of Cosmic Acceleration 261 ...... 1
Recent Developments in the Proton Radius Puzzle 223 ...... 2
Frontiers in Electroweak Symmetry Breaking 67 ...... 2
Latest LHC Results 343 ...... 3
Recent Progress in Hadron Spectroscopy Using Lattice QCD 69 ...... 3
Recent Results from GlueX 82 ...... 4
Astrophysical Neutrinos from IceCube 275 ...... 4
Dark Matter Interpretation of the Neutron Decay Anomaly 32 ...... 4
The KATRIN Neutrino Mass Measurement: Experiment, Status, and Outlook 248 . . . . . 5
Rare Decays Probing Physics Beyond the Standard Model 322 ...... 6
Laboratory Probes of the Neutron-Matter Equation of State 165 ...... 6
Studying the Electroweak Sector with the ATLAS Detector 43 ...... 6
Results from ANITA 196 ...... 7
Project 8: Cyclotron Radiation Emission Spectroscopy, a New Technique in Direct Neutrino Mass Measurement 180 ...... 8
Overview of Experimental Data on the Neutron-Matter Equation of State and the Neutron Skins of 48Ca and 208Pb 71 ...... 8
Search for Dark Matter Decay of the Free Neutron from the UCNA Experiment: n → χ + e+e− 58 ...... 9
B → πℓℓ and B → Kℓℓ Decay Form Factors from Lattice QCD 218 ...... 9
Recent Developments in Higgs Physics Precision Calculations 281 ...... 10
Precision Constraints on Nuclear and Neutrino Reactions via Big Bang Nucleosynthesis 197 ...... 10
iii Neutron Skins and Neutron Star Properties 231 ...... 11
Dark Decay of the Neutron 21 ...... 11
Recent Borexino Measurements of Solar Neutrinos from the pp-Chains with Prospects for Detection of CNO Neutrinos 225 ...... 12
Neutrino Masses from a Pseudo-Dirac Bino and Its LHC Implications 274 ...... 12
Composite Dark Matter 99 ...... 13
Neutrinos from Beta Processes in Presupernovae 68 ...... 13
Nuclear-Matter Equation of State from Chiral Effective Field Theory 166 ...... 14
Search for LNV by the NA48 Experiment 282 ...... 14
Solar and Supernova Neutrino Detection in the Deep Underground Neutrino Experiment 286 ...... 15
The Myriad Wonders and Challenges of Gd-Loading in WC Detectors 276 ...... 15
Search for K+ → π+νν at CERN 96 ...... 16
Sexaquark Dark Matter 359 ...... 16
Modification of Higgs Pair Production at the LHC283 ...... 17
Constraining Ab Initio Models and the Nuclear Force with Rare Isotopes 115 ...... 17
Multi-Angle Simulations of Matter-Neutrino Resonance 159 ...... 18
The MEG Experiment: Run I Final Results and Preparation for RunII198 ...... 18
Experimental Signatures of Ultra-Light Dark Matter 331 ...... 19
First 0νββ Decay Search Results from CUORE and Status of CUPID R&D 140 ...... 19
Model Independent Constraints on R(J/ψ) 14 ...... 20
EDMs: Theory Overview 252 ...... 20
Measurements and Searches of Higgs Boson Decays to Two Fermions 45 ...... 21
Worldwide Search for a Neutron EDM 191 ...... 21
Recent Results from the Axion Dark Matter Experiment (ADMX) 273 ...... 22
Implication of Chiral Symmetry on the Heavy-Light Spectroscopy 141 ...... 22
Evidence for Higgs Boson Production in Association with a tt¯Pair 46 ...... 23
Status and Initial Results of the Majorana Demonstrator 62 ...... 23
The Mu2e Experiment 156 ...... 24
Towards TUCAN’s Search for the Neutron Electric Dipole Moment 205 ...... 24 Status and Future Plans for the HAYSTAC Experiment 357 ...... 25
Measurement of Cross Sections and Properties of the Higgs Boson in Decays to Bosons Using the ATLAS Detector 44 ...... 26
Precise Measurement of the D⋆(2010)+ − D+ Mass Difference 170 ...... 26
DM Radio: An Optimized Resonant Search for Axion and Hidden-Photon Dark Matter 241 27
PEN Experiment: a Precise Test of Lepton Universality 175 ...... 27
Status of the Storage Ring Proton EDM Experiment 258 ...... 28
LEGEND: The Large Enriched Germanium Experiment for Neutrinoless Double-Beta Decay 210 ...... 28
Dibaryon Searches in Decuplet Baryons from Lattice QCD 130 ...... 29
Searches for Rare and Non-Standard Model Decays of the Higgs Boson 47 ...... 29
The Radium-225 Experiment 192 ...... 30
Improved Search for Heavy Neutrinos and a Test of Lepton Universality in the Decay π → eν 120 ...... 30
Deep Neural Networks for Energy and Position Reconstruction in EXO-200 311 . . . . . 31
ABRACADABRA: A New Approach to the Search for Axion Dark Matter 57 ...... 31
Precision Measurements with Di-Bosons at the LHC 259 ...... 32
Progress on the Nucleon EDM in Lattice QCD 107 ...... 33
Single-Top Production in the Standard Model and Beyond 10 ...... 33
RD and RD*: Theoretical Developments 212 ...... 33
Probing Sub-GeV Dark Matter with Superfluid Helium 228 ...... 34
Status and Future for the NEXT Collaboration in Neutrinoless Double Beta Decay 150 . . 34
Heavy Higgs Search in the Models with Vectorlike Fermions 291 ...... 35
Search for Neutrinoless Double-Beta Decay with SNO+ 270 ...... 35
Search for Time Reversal Invariance Violation in Resonances of Compound Nuclei Acces- sible Using Epithermal Neutrons 139 ...... 36
Measurement of Polarization Observables in the Reaction γp → K+Λ 179 ...... 36
The Light Dark Matter eXperiment 184 ...... 37
Diagnosing New Physics with Lepton Universality Violation and Lepton Flavor Violation 318 ...... 37
Lepton Universality Violation 235 ...... 38
Experimental Status of Vub/Vcb and the CKM Angle γ 77 ...... 38 Measurement of the Weak Charge of the Proton by the Qweak Collaboration 171 . . . . . 39
Electromagnetic Properties of Antihydrogen and the Antiproton: Recent Results from AL- PHA and BASE 90 ...... 39
Symmetries and Interactions from Lattice QCD 95 ...... 40
NPDGamma: The Final Chapter 73 ...... 41
Standard Model Tests in Neutron and Nuclear Beta Decay 81 ...... 41
The Commissioning Run Update of the Muon g-2 Experiment at Fermilab 279 ...... 42
Dark Matter Searches with the ATLAS Detector 38 ...... 42
Inflation Ends, What is Next? 245 ...... 43
Reactor Neutrino Oscillation at Daya Bay 249 ...... 43
Stellar Explosions in the Lab: Measurements of Key Nuclear Reactions Driving Nucleosyn- thesis 125 ...... 43
Introduction to the CKM Matrix 350 ...... 44
Hadronic Contributions to Muon g-2 and Spin Structure Functions 1 ...... 44
Nuclear Astrophysics Underground: Status & Future 28 ...... 45
Using Microhalos to Probe the Universe’s First Second 154 ...... 45
Mono-X Searches for Dark Matter with the CMS Detector 353 ...... 46
Latest Results of the Double Chooz Experiment 285 ...... 46
Combined Measurement of the CP Violating Angle β by the BaBar and Belle Experiments 157 ...... 47
Cosmology with a Helical Flavor 26 ...... 48
Dispersive Analysis of Hadronic Light-by-Light Scattering and the Muon’s (g-2) 7 . . . . 48
Improving Astrophysical Nuclear Rates with New Many-Body and Fewer-Body Reaction Models 153 ...... 48
Cosmological Probes of Dark Matter Interactions 344 ...... 49
Searches for Dark Matter Mediators with the ATLAS Detector 39 ...... 49
PROSPECT: a Precision Reactor Oscillation and SPECTrum Short-Baseline Antineutrino Experiment 145 ...... 50
Probing Explosive Nucleosynthesis with TwinSol Measurements 86 ...... 50
Hadronic Matrix Elements for Muon g–2 in Lattice QCD 256 ...... 51
Determination of Vub and Vcb 216 ...... 51
Sensitivity Study for the 12C(α, γ)16O Astrophysical Reaction Rate 94 ...... 52 Accelerator and Reactor Complementarity in Coherent Neutrino-Nucleus Scattering 22 . 52
First Collisions at Belle II 189 ...... 53
Searches for Dark Matter Mediators with the CMS Detector 354 ...... 53
Measurement of Hadronic Cross Sections at BESIII 287 ...... 54
Self-Interacting Dark Matter and Diverse Galactic Rotation Curves 306 ...... 54
Hidden Sectors and Dark Photons 297 ...... 55
Measurement of the Neutron Lifetime Using a Magneto-Gravitational Trap 147 ...... 55
Recent Progress in Nuclear Parton Distributions 144 ...... 56
Searching for Dark Matter at the Cosmic Dawn 29 ...... 56
Recent Long-Baseline Neutrino Mixing Results from NOvA 200 ...... 57
Understanding the EMC Effect Through Tagged Processes with ALERT 215 ...... 57
Search for Di-Higgs Production 49 ...... 58
A Particle Physicist’s Perspective on the EDGES Anomaly 246 ...... 58
Measurement of the Electron-Antineutrino Correlation in Neutron Beta Decay: aCORN Experiment 123 ...... 58
Searches for Hidden Sectors with BABAR 60 ...... 59
Searches for Non-Standard Model Higgs Bosons 48 ...... 60
Update on the Jefferson Lab Hall A Tritium Experiments 323 ...... 60
Neutrino Oscillation Results from the T2K Experiment 310 ...... 60
Nuclear PDF, Small x Physics Results at RHIC 111 ...... 61
Realizing the Promise of 21 cm Cosmology with HERA 188 ...... 62
Highlights from SUSY Searches with the CMS Detector 328 ...... 62
New Results from the UCNA Experiment 208 ...... 63
Direct Search for Dark Photons and Dark Higgs with the SeaQuest Spectrometer at Fermi- lab 8 ...... 63
Cold-QCD Physics of the STAR Forward Upgrade 293 ...... 64
21 cm Dark Energy Cosmology with CHIME 88 ...... 64
New Measurements of the EMC Effect in Hall-C at Jefferson Lab183 ...... 65
The Beam Dump eXperiment 16 ...... 65
The Short Baseline Neutrino Oscillation Program at Fermilab 321 ...... 66 Beta Decay Asymmetry Measurements with Trapped Atoms 70 ...... 67
Searches for Physics Beyond the Standard Model with Third-Generation Quarks 303 . . . 67
Gravitational-Wave Transient Astronomy on the Rise 33 ...... 68
Nuclear Beta Decays and CKM Unitarity 66 ...... 68
Characterizing Single-Phase LArTPC Detector Performance with MicroBooNE 162 . . . . 69
Search for Light Dark Matter with the MESA Accelerator 351 ...... 69
ATLAS Searches for Diboson Resonances 41 ...... 70
The Search for the Onset of Color Transparency 113 ...... 70
EIC at Small-x: Connections to p+p/A & A+A Physics at RHIC & LHC 355 ...... 71
Event Reconstruction Techniques for ANNIE Phase II 195 ...... 71
Did LIGO Detect Dark Matter? 27 ...... 72
Recent Status of Weak-Interaction Tests via Precision Superallowed Beta-Decay Measure- ments at TRIUMF 13 ...... 72
Mining the LHC Data for Anomalies 163 ...... 73
Searching for New Forces with Dark Light 265 ...... 73
The Search for the Color Transparency in Hall C at Jefferson Lab134 ...... 74
Hadron in Jet Fragmentation 30 ...... 75
Theia: A Multi-Purpose Water-Based Liquid Scintillator Detector 34 ...... 75
+ + New Evaluation of the γW -box Correction to 0 −0 Nuclear β-Decay and Vud Extraction 3 ...... 76
Theoretical Results for Charged-Higgs Production 9 ...... 76
The Cosmic Origin of the Heavy Elements: Implications from the Neutron Star Merger GW170817 288 ...... 76
Resonance Search for a Heavy Photon with the Heavy Photon Search Experiment 260 . . 77
The APEX Experiment at Jefferson Lab: A Search for a New Vector Boson366 ...... 78
Recent Results on Heavy Flavor Production in High Energy Nuclear Collisions 207 . . . . 78
Status of Searches for Chiral Magnetic Effects in Nuclear Collisions 75 ...... 79
Physics with an Electron-Ion Collider 302 ...... 79
Recent Results from Dark Matter Direct Detection Experiments 89 ...... 79
New Directions in the Search for Light and Ultralight Dark Matter 104 ...... 80
Coherent Scattering and the Flavor Physics and Detection of Supernova Neutrinos 83 . . 80 IceCube: Opening a New Window on the Universe from the South Pole 31 ...... 81
Two-Photon Effects in Elastic Nucleon Form Factors 292 ...... 81
New Studies of the EMC Effect and Short-Range Correlations 190 ...... 82
Status of the nEXO Experiment 236 ...... 82
Influence of the QCD Equation of State by System Size 313 ...... 83
Supernova 1987A Constraints on Sub-GeV Particles 358 ...... 83
Glue Spin from Lattice QCD 214 ...... 84
Searches for New Phenomena in Leptonic Final States Using the ATLAS Detector 42 . . . 84
Demonstration of Single Barium Ion Sensitivity for Neutrinoless Double Beta Decay Using Single Molecule Fluorescent Imaging 242 ...... 84
CMS Results on Small Systems 315 ...... 85
Initial Dark Matter Results from the SuperCDMS Single-Charge Sensitive Detectors 262 . 85
Isospin Dependence of the EMC Effect and Nucleon Short-Range Correlations 213 . . . . 86
Searches for BSM Physics with the CMS Detector 336 ...... 87
Overview of Longitudinal Spin Physics Results from RHIC 59 ...... 87
PHENIX Results on Collectivity in Small Systems 330 ...... 88
Overview of Decay-At-Rest Neutrino Sources 6 ...... 88
Status and Prospects of CDEX-10 64 ...... 89
High Q2 Elastic Form Factor Program at Jefferson Lab 257 ...... 89
Short-Range Correlations 100 ...... 90
Signatures of Hydrodynamic Behavior in Small Collision Systems 346 ...... 90
EFT for Higgs Physics 138 ...... 91
SENSEI Experiment for Direct Search of Light Dark Matter 371 ...... 91
Nucleon Spin Structure Measurements at JLab 11 ...... 92
CEvNS Observation at the SNS with the COHERENT Experiment 264 ...... 92
Proton Polarizabilities from a Partial-Wave Analysis of Compton Scattering Data / Sum Rules Connecting Real and Virtual Compton Scattering on the Nucleon 169 ...... 93
New Results on Three-Nucleon Short Range Correlations 182 ...... 94
Recent MiniBooNE Results: First Measurement of Monoenergetic Muon Neutrino Charged Current Interactions and a Search for Vector Portal Dark Matter 146 ...... 94
Hadron Multiplicity and Fragmentation in SIDIS 24 ...... 95 Current Status of Hydrodynamic Modeling from p+p to Heavy Ions 122 ...... 95
Probing Hidden Sectors at the LHC 309 ...... 96 keV Sterile Neutrinos as Dark Matter and the 3.5 keV Line 300 ...... 96
Overview of DUNE 299 ...... 97
Latest Results from the AMS Experiment on the International Space Station 133 . . . . . 97
Searching for Ultra-Heavy Dark Matter 332 ...... 98
The Nucleon Axial Coupling from Quantum Chromodynamics 186 ...... 98
Recent Results from the Dark Energy Survey 329 ...... 99
Precision Atomic Tests of Physics Beyond the Standard Model 267 ...... 99
Overview of Recent Results from the ATLAS Experiment 54 ...... 100
Darkside Status and Prospects 324 ...... 100
Muon g-2 Experiments at FNAL and J-PARC 277 ...... 101
The eBOSS Survey: Recent Results and Prospects 19 ...... 101
Overview of Recent Heavy Ion Results from the CMS Experiment 363 ...... 102
New Results and Update on Ultrahigh Energy Cosmic Rays 360 ...... 102
The Nucleon Axial Form Factor from Quantum Chromodynamics 263 ...... 103
Measurements of Neutrino-Nucleus Scattering from 0.1–10 GeV 268 ...... 103
Results and Plans for the PICO Dark Matter Bubble Chamber 239 ...... 104
The Latest Analyses of the LUX Dark Matter Project 101 ...... 104
New Results on Low-Energy Exclusive Hadronic Cross Sections from BaBar and Implica- tions for g-2 of the Muon 149 ...... 105
Recent Highlights from the High Altitude Water Cherenkov Observatory 85 ...... 105
Neutrinoless Double Beta Decay in Chiral Effective Field Theory 121 ...... 106
The CAPTAIN Program: Status and Plans 319 ...... 106
ALICE Upgrades for Run3 and Physics Projections 250 ...... 107
Cosmology with the Atacama Cosmology Telescope 266 ...... 107
LUX Sensitivity to Effective Field Theory Interactions 271 ...... 108
IceCube/DeepCore Results on Neutrino Properties Using Atmospheric Neutrinos 87 . . . 108
Neutrino Scattering Studies in MicroBooNE 201 ...... 109
Parton Shower Modification Studied with Jet Substructure in ALICE 314 ...... 109 Baryogenesis via Particle–Antiparticle Oscillations 61 ...... 110
Current Status of Neutrinoless Double-Beta Decay Matrix Elements 114 ...... 110
BICEP/Keck: Constraining the Primordial Gravitational-Wave Signal with CMB Polariza- tion Observations from the South Pole 211 ...... 111
Overview of Nuclear Beta Decay Tests of Fundamental Symmetries 76 ...... 112
Search for Neutron-Antineutron Oscillations at the Sudbury Neutrino Observatory 203 . 112
Position Reconstruction Using Photon Timing for the DEAP-3600 Liquid Argon Dark Mat- ter Experiment 202 ...... 113
Recent Status and Future Plans for the China JinPing Underground Laboratory 65 . . . . 113 b-Jet Tagging Performance with ALICE 289 ...... 114
Hadron Production Measurements for Long-Baseline Neutrino Experiments with NA61/SHINE 284 ...... 114
Isolating Neutrino Cross Section Uncertainties with Theory 136 ...... 115
NuSTAR and Super-Eddington Accretion onto Neutron Stars 326 ...... 116
The Application of Deep Learning to Event-by-Event Simulations of Relativistic Hydrody- namics 327 ...... 116
The Simons Observatory and CMB-Stage IV 325 ...... 117
Multi-Wire 3D Gas Tracker for Searching New Physics in Nuclear Beta Decay 63 . . . . . 118
Neutron-Antineutron Conversion to Search for B-L Violation 161 ...... 118
COSINE-100 and Tests of DAMA 307 ...... 119
Status of Baryon-Baryon Interactions from Lattice QCD 194 ...... 119
Review of the First W Boson Mass Measurement with the ATLAS Detector 109 ...... 120
Dark Matter Interpretation of the Galactic Center Gamma Ray Excess 335 ...... 120
Probing BSM and High-x Physics with SoLID at JLab 172 ...... 121
0 Short-Distance Matrix Elements for D -Meson Mixing from Nf = 2 + 1 Lattice QCD 187 121
Unpolarised Parton Distribution Functions Today: Needs, Achievements and Challenges 5 122
The Weak Charge: From Atoms to the Z-Pole 377 ...... 122
Physics with Electroweak Probes at the Electron-Ion Collider 222 ...... 123
B and D Meson Leptonic Decay Constants and Quark Masses from Four-Flavor Lattice QCD 337 ...... 123
Parton Distribution Functions with Intrinsic Charm and Other News from CTEQ 181 . . 124
HOBET: The SM as an Effective Theory and its Direct Matching to LQCD316 ...... 125 GAPS: a New Cosmic-Ray Antimatter Experiment 224 ...... 125
Latest Updates from the AlCap Experiment 174 ...... 126
Prospects for New Atomic Parity Violation Experiments 280 ...... 126
Probing the Nucleon and Nucleus Structures with Drell-Yan Process Induced by a 120 GeV/c Proton Beam 204 ...... 127
Effective-Field-Theory Extrapolations of Lattice-QCD Predictions for Light Nuclei296 . . 127
Semileptonic Bs Decays 295 ...... 128
Parity Violating Electron Scattering Experiments for an Ultra Precise Determination ofthe Weak Mixing Angle at Low Energies 367 ...... 128
Cosmological Bounds on Non-Abelian Dark Forces 164 ...... 129
Muon Capture as a Probe of the Weak Axial Current 308 ...... 129
Electroweak, Jet and Heavy Flavor Probes in Proton-Lead Collisions at the LHC 110 . . . 130
Unify the SU(3) Topological Diagram and Irreducible Representation Amplitudes for B De- cays 18 ...... 131
New Developments in Lattice Effective Field Theory 72 ...... 131
High Precision Extraction of AFB at the LHC 365 ...... 132
Antimatter Gravity with Muonium 352 ...... 132
Signatures of Superradiant Axions from Lasing and Binary Merger Events 155 ...... 133
Current Status of Nuclear Forces from Chiral EFT 92 ...... 133
Jet Measurements in Heavy Ion Collisions 237 ...... 133
Sites of the r-process: supernovae and mergers: Recent Successes and Current Issues 247 134
TMDs - Transverse Connections Between Nuclear and Particle Physics 17 ...... 134
Sterile Neutrinos in the Early Universe 253 ...... 135
Analysis of ηπ0 and η/ π0 Systems at GlueX 158 ...... 135
Non-Standard Neutrino Interactions 294 ...... 136
Microscopic Shell Model Interactions and Effective Operators 342 ...... 136
Transverse Spin Related Measurements at RHIC 108 ...... 137
Toward Precise Determination of Resonant Hadron Scattering Amplitudes from Lattice QCD 80 ...... 137
Properties of the Binary Neutron Star Merger GW170817 176 ...... 138
The Theory of Jets in Dense Matter 361 ...... 138 Detecting CP Violation in the Presence of Non-Standard Neutrino Interactions 25 . . . . 139
Transverse Momentum Distributions: Recent News from HERMES and COMPASS 348 . . 139
Experimental Tests of Ab Initio Calculations of Nuclear Structure 106 ...... 140
Numerical Simulations of Neutron Star Mergers 177 ...... 140
A Lattice QCD Study of the ρ Resonance 369 ...... 141
Using Photon-Jet Analyses to Probe the QGP 269 ...... 142
Neutrino Oscillations and Supernova Nucleosynthesis 217 ...... 142
Current Status of Very-Large-Basis Hamiltonian Diagonalizations for Nuclear Physics 341 143
Jet Mass for the Inclusive Jet Production at the LHC 37 ...... 143
First Extraction of Transversity from Data on Lepton-Hadron Scattering and Hadronic Col- lisions 127 ...... 144
Applications of Chiral Forces to Nuclear Matter and Neutron Stars 167 ...... 144
Measurement of Transition Form Factors at BESIII 290 ...... 145
Light Quark Fragmentation Studies at the B-Factories 142 ...... 145
Heavy Flavor Jet Quenching at RHIC and LHC Energies 240 ...... 146
Prospects for ab-initio Calculations of Nuclei with Quantum Computing 317 ...... 146
Studying Lanthanide Production in r-Process Nucleosynthesis 305 ...... 147
Collective Neutrino Oscillations in the Presence of Collisions 151 ...... 147
Unitary Reaction Models and PWA Formalisms 126 ...... 148
Neutrino Flavor Transformation and the Cosmic Lepton Asymmetry 340 ...... 148
Weakly Bound Neutron-Rich Nuclei and Cosmic Phenomena 278 ...... 149
Achievements and Open Issues in the Determination of Fragmentation Functions 232 . . 149
R-Process Experiments with Unstable Isotope Beams 173 ...... 150
Energy and System Dependent Heavy Flavor Measurements at PHENIX at RHIC 112 . . 150
New Techniques in the ANITA-IV Analysis 199 ...... 151
Neutrino Burst-Generated Gravitational Radiation from Collapsing Supermassive Stars 339 151
Search for Anomalous Decay of the Free Neutron Using the UCNA Experiment: n → χ + e+ + e− 333 ...... 152
A New Symmetry of Electroweak Lagrangian 91 ...... 153
Visualizing Invisible Dark Matter Annihilation with the CMB and Matter Power Spectrum 379 ...... 153 In-Ice Phased Antenna Arrays for Radiodetection of Energetic Neutrinos 378 ...... 154
Composite Higgs from Mass-Split Models 370 ...... 154
Demonstration of 3D Micro-Power Readout for Liquid Argon Time Projection Chambers 373 ...... 155
Results from MICE: the Muon Ionization Cooling Experiment 372 ...... 155
Phases of UV Dark Matter Freeze In 375 ...... 156
Possibilities for Underground Physics in the Pyhäsalmi Mine 374 ...... 156
Progress Towards Measurement of the Nuclear Anapole Moment of Ba-137 Using BaF Molecules 376 ...... 157
Using X-Ray Femtoscope and X-Ray Telescope We Verified that Dark Matter Behaves as Catalyst or as Inhibitor of the Nuclear Reactions 12 ...... 157
Lessons from HAWC PWNe Observations: The Diffusion Constant is Not a Constant; Pul- sars Remain the Likeliest Sources of the Anomalous Positron Fraction; Cosmic Rays are Trapped for Long Periods of Time in Pockets of Inefficient Diffusion 15 ...... 158
Introducing the SnowBall Chamber, Supercooled Water for Dark Matter and Neutron De- tection 368 ...... 159
Search for a Nuclear Magnetic Quadrupole Moment in 173Yb 56 ...... 159
Half-Lives of the Neutron-Rich N = 82 Isotopes 130Cd and 131In 226 ...... 160
Recent Progress on Double Beta Decay and Latest GERDA Results 84 ...... 161
Neutrino Oscillations 74 ...... 161
Fingerprints of the First Stars in the Sky-Averaged Radio Spectrum 105 ...... 161
The EMC Effect – New Insights and Future Studies 233 ...... 162
Short-Range Correlations in Nuclei 78 ...... 163
Light-Cone Physics and Large-Momentum Effective Field Theory 234 ...... 163
The Structure of the Nucleon 380 ...... 164
LIGO/VIRGO Observations of Neutron Star Merger GW170817 124 ...... 164
Outflow from Neutron Star Mergers 93 ...... 165
Physics from the Gravitational and Electromagnetic Waves of a Neutron Star Merger 238 165
The Proton Radius Puzzle – Why We All Should Care 131 ...... 165
CMS Physics Performance with Precision Timing 338 ...... 166
Accessing the Generalized Parton Distributions in the Valence Region at Jefferson Labora- tory 23 ...... 166
Hadronic Parity Violation and the Large-Nc Expansion 255 ...... 167 QCD Phase Diagram 304 ...... 167
Expected Performance of the Upgraded ATLAS Experiment for HL-LHC 119 ...... 168
Drell-Yan Physics with Negative Pion Beams and Polarized Proton Targets at COMPASS 347 ...... 168
The Rydberg Constant and Proton Size from Atomic Hydrogen 148 ...... 169
Final Results from the n3He Experiment: Parity Violation in n-3He Capture 178 . . . . . 170
Lattice QCD Constraints on the QCD Critical Point 364 ...... 171
Precision Timing with the CMS Detector 334 ...... 171
Data Analysis and Preliminary Results of the Proton Charge Radius Experiment (PRad) at JLab 102 ...... 171
Large-Nc HPNC Analyses Post NPDGamma 2 ...... 172
Generalized Parton Distributions of the Deuteron in a Covariant Framework 168 . . . . . 173
Searching for the QCD Critical Point Through Fluctuations at RHIC 227 ...... 173
Muon Spectrometer Phase I Upgrade for the ATLAS Experiment: The New Small Wheels Project 298 ...... 174
Determination of the Proton’s Charge Radius by Simultaneous Measurement of Electron- and Muon-Proton Elastic Scattering with the MUSE Experiment at PSI 193 ...... 174
Lattice QCD for Hadronic Parity Violation 243 ...... 175
What Have We Leant from Quarkonia Production in Relativistic Heavy Ion Collisions? 312 176
Probing the Strange Sea Quarks with Kaon SIDIS 35 ...... 176
Machine Learning for New Physics Searches 272 ...... 177
The sPHENIX Detector 362 ...... 177
Lattice QCD and the Proton Radius 251 ...... 178
Nuclear Anapole Moments 254 ...... 178
The RHIC Beam Energy Scan Phase II Physics and Upgrades 230 ...... 179
Novel Experimental Probes of QCD in SIDIS and e+e− Annihilation 143 ...... 179
How a Future Leptonic Collider Will Indirectly Probe Neutralino Dark Matter 320 . . . . 180
Nucleon Form Factors in Dispersively Improved Chiral Effective Theory 356 ...... 180
Searching for Hadronic CP Violation in Deformed Nuclei with Polar Molecules 55 . . . . 181
Merging Black Holes and Einstein’s Ripples in Space Time: The Story of Advanced LIGO 381 ...... 182
Physics at High Energies 382 ...... 182 Precision Physics at High Intensities 383 ...... 182
Neutrino Masses and Neutrino Mixing 385 ...... 183
Particle and Nuclear Astrophysics 388 ...... 183
Nuclear Forces and Structure, NN Correlations, and Medium Effects 392 ...... 184
Heavy Flavors and the CKM Matrix 389 ...... 184
QCD, Hadron Spectroscopy, and Exotics 390 ...... 184
Parton and Gluon Distributions in Nucleons and Nuclei 391 ...... 185
Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity 384 ...... 185
Dark Matter 387 ...... 186
Tests of Symmetries and the Electroweak Interaction 386 ...... 186
Quark Matter and High Energy Heavy Ion Collisions 393 ...... 186
Closing Remarks 394 ...... 187 CIPANP 2018 - Thirteenth Conference on the Intersections of Particle … / Book of Abstracts
Plenary 1 / 0
Opening
Author: Wick Haxton1
1 UC Berkeley and LBNL
Corresponding Author: [email protected]
I will welcome the participants of CIPANP 2018 and briefly review the history of this meeting that strives to strengthen the connections between nuclear, particle, and astro physicists.
E-mail: [email protected]
Plenary 1 / 219
New Results from the Dark Energy Survey and the South Pole Telescope
Author: Eric Baxter1
1 University of Pennsylvania
Corresponding Author: [email protected]
Astronomical surveys that map the cosmic microwave background (CMB) and the distribution of large scale structure of the Universe have demonstrated an impressive ability to constrain cosmology and to probe fundamental physics. In this talk, I will present an overview of recent results from the South Pole Telescope, which maps the CMB at small angular scales, and the Dark Energy Survey, which measures large scale structure via the positions of galaxies and weak gravitational lensing. Both experiments have already yielded exciting cosmological and astrophysical constraints, and are poised to advance these constraints significantly in the near future.
E-mail: [email protected]
Collaboration name: Dark Energy Survey and South Pole Telescope Collaborations
Plenary 1 / 261
Theories of Cosmic Acceleration
Author: Austin Joyce1
1 Columbia University
Page 1 CIPANP 2018 - Thirteenth Conference on the Intersections of Particle … / Book of Abstracts
Corresponding Author: [email protected]
I will survey our understanding of cosmic acceleration, both in the late and early universe. The focus will be on recent theoretical developments in the study of dark energy and in the physics of inflation. We will also discuss constraints both from current and future observations.
E-mail: [email protected]
Plenary 1 / 223
Recent Developments in the Proton Radius Puzzle
Author: Helene Fleurbaey1
1 NIST
Corresponding Author: [email protected]
The CODATA-recommended value of the proton rms charge radius rp is based on hydrogen/deuterium spectroscopy and electron–proton/deuteron scattering experiments. Since 2010, a discrepancy be- tween the rp value determined from muonic hydrogen spectroscopy and the CODATA-recommended value has led to intense research activity both in theory and experiment. The situation has recently become even more puzzling as a contradiction appeared between two new hydrogen spectroscopy results: the 2S-4P transition frequency [Beyer et al., Science 358, 2017] agrees with the muonic rp value, while the 1S-3S transition frequency presented here supports the CODATA value. In our experiment at Laboratoire Kastler Brossel (Paris, France), the two-photon 1S-3S hydrogen transition is excited in an atomic beam, with a continuous-wave 205-nm laser obtained by sum frequency generation in a non-linear crystal. The transition frequency is measured with respect to the LNE-SYRTE Cs clock by means of a frequency comb. The second-order Doppler shift and other systematic effects have been included in the analysis to determine the 1S-3S transition frequency with a relative uncertainty of 9 × 10−13 [Fleurbaey et al., PRL accepted for publication, 2018]. The value of the proton radius which can be inferred is in very good agreement with the CODATA- recommended value. In this talk, I will present the current situation of the proton radius puzzle and our latest results.
E-mail: [email protected]
Plenary 2 / 67
Frontiers in Electroweak Symmetry Breaking
Author: Sally Dawson1
1 BNL
Corresponding Author: [email protected]
Page 2 CIPANP 2018 - Thirteenth Conference on the Intersections of Particle … / Book of Abstracts
The Higgs discovery changed our understanding of electroweak symmetry breaking, and the current theoretical focus is on illuminating the properties of the Higgs boson. I will discuss the Standard Model Higgs sector as the low energy limit of unknown high scale physics and present the status of theoretical calculations in the electroweak symmetry breaking sector and prospects for future discoveries.
E-mail: [email protected]
Plenary 2 / 343
Latest LHC Results
Author: Petar Maksimovic1
1 Johns Hopkins University
Corresponding Author: [email protected]
This talk highlights recent results from the LHC experiments, and briefly describes the prospectsfor the future measurements.
E-mail: [email protected]
Collaboration name: CMS, ATLAS, LHCb, ALICE
Plenary 2 / 69
Recent Progress in Hadron Spectroscopy Using Lattice QCD
Author: Jozef Dudek1
1 William & Mary / Jefferson Lab
Corresponding Author: [email protected]
Lattice QCD has matured to a degree where it is now possible to study excited hadrons asthey truly appear in nature, as short-lived resonant enhancements decaying into multiple possible final states. Through variational analysis of matrices of correlation functions computed with large basesofin- terpolating fields it has proven possible to extract many excited state energy levels, and thesecan be used to constrain the hadron-hadron scattering amplitudes in which hadron resonances canbe observed. I will illustrate recent progress with several examples including coupled-channel scattering in the πη/KK¯ and ππ, KK,¯ ηη systems in which the a0, f0 mesons appear.
E-mail: [email protected]
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Plenary 2 / 82
Recent Results from GlueX
Author: Justin Stevens1
1 William & Mary
Corresponding Author: [email protected]
The GlueX experiment is located in the recently constructed experimental Hall D at Jefferson Lab (JLab), and provides a unique capability to search for hybrid mesons in high-energy photoproduction, utilizing a 9 GeV linearly polarized photon beam. Commissioning of the Hall D beamline and GlueX detector was recently completed and the data collected in the spring of 2017 officially began the GlueX physics program. The statistical precision of this initial dataset surpasses the previous world data on polarized photoproduction in this energy domain by orders of magnitude. First results from this dataset will be presented along with the plan for acquiring higher statistics datasets to begin the search for hybrid mesons at GlueX.
E-mail: [email protected]
Collaboration name: GlueX Collaboration
Funding source: Department of Energy Early Career Award contract DE-SC0018224
Particle and Nuclear Astrophysics / 275
Astrophysical Neutrinos from IceCube
Author: Spencer KleinNone Corresponding Author: [email protected]
In this talk, I will present the latest results on astrophysical neutrinos from IceCube, including our non-detection of GW170817. I will also briefly present two IceCube results on the cross-section and inelasticity distributions for high-energy (E > 1 TeV) neutrino interactions.
E-mail: [email protected]
Collaboration name: IceCube
Funding source: NSF and DOE
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Dark Matter / 32
Dark Matter Interpretation of the Neutron Decay Anomaly
Author: Bartosz Fornal1
Co-author: Benjamin Grinstein 1
1 University of California, San Diego
Corresponding Author: [email protected]
There is a long-standing discrepancy between the neutron lifetime measured in beam andbottle experiments. We propose to explain this anomaly by a dark decay channel for the neutron, involving one or more dark sector particles in the final state. If any of these particles are stable, they can bethe dark matter. We construct representative particle physics models consistent with all experimental constraints.
E-mail: [email protected]
Neutrino Masses and Neutrino Mixing / 248
The KATRIN Neutrino Mass Measurement: Experiment, Status, and Outlook
Author: Gregg Franklin1
1 Carnegie Mellon University
Corresponding Author: [email protected]
The Karlsruhe Tritium Neutrino (KATRIN) experiment will provide a measurement of the effective electron-neutrino mass, m(νe), based on a precision measurement of the tritium beta decay spectrum near its endpoint. The effective mass is an average of the neutrino massP eigenstates mi weighted 2 3 | |2 2 by the flavor-mass mixing parameters Uei according to the relation m (νe) = i=1 Uei mi . The KATRIN apparatus uses a windowless gas tritium source (WGTS) and a spectrometer based on the MAC-E-Filter concept to measure the beta energy spectrum. The KATRIN program is designed to reach a mass sensitivity of 0.2 eV (90 % C.L.). The collaboration has completed a series of commis- sioning measurements and is moving into the first running of tritium. This talk will provide an overview of the KATRIN apparatus with emphasis on the MAC-E filter. Results from the initial commissioning runs and the status of the initial tritium beta-spectrum mea- surements will be presented.
E-mail: [email protected]
Collaboration name: KATRIN Collaboration
Funding source: The primary support for US participation in KATRIN is provided by the U.S. DOE, Office ofNuclear Physics, under award number DE-FG02-97ER41020
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HFCKM / PPHI / 322
Rare Decays Probing Physics Beyond the Standard Model
Author: Gerco Onderwater1
1 University of Groningen
Corresponding Author: [email protected]
The existence of three generations of fundamental fermions gives rise to a wealth of phenomena, such as CP violation and flavour oscillations. Because of various conservation laws, including baryon number, lepton number and charged lepton flavour conservation, many otherwise possible reactions, asymmetries, and decays are prohibited or strongly suppressed. The search for rare decays helps to explore the range of validity of such laws and, once observed, rare decays may guide in identifying possible physics not yet incorporated in the Standard Model. An overview of characteristic searches and typical approaches will be presented.
E-mail: [email protected]
Collaboration name: LHCb
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 165
Laboratory Probes of the Neutron-Matter Equation of State
Author: Betty Tsang1
1 Michigan State University
Corresponding Author: [email protected]
The nuclear Equation of State (EoS) is central to the understanding of the matter found inneutron stars and in explosive stellar environments. This includes the dynamics in neutron star mergers or core collapse supernovae in which many of the heavy elements are formed. Such environments are often neutron-rich and their description requires extrapolating the properties of neutron-rich matter from that of symmetric matter containing equal numbers of neutrons and protons. This extrapolation is governed by the nuclear symmetry energy, which can be defined to be the difference between the EoS of neutron matter and that of symmetric matter. In this talk, I will discuss the experimental probes using heavy ion collisions with different isospin reactions to explore the symmetry energy from sub-normal to supra-normal density and its implication to the tidal deformability in the neutron star merger.
E-mail: [email protected]
Funding source: US National Science Foundation Grant No. PHY-1565546
Physics at High Energies / 43
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Studying the Electroweak Sector with the ATLAS Detector
Author: Margherita Spalla1
1 Max Planck Institute for Physics - Munich
Corresponding Author: margherita.spalla@cern.ch
The large integrated luminosities that are available at the LHC, allow to test the gauge structureof the electroweak sector of the Standard Model to highest precision. In this talk, we review the latest results of the ATLAS collaboration involving di-boson and multiboson final states, the electroweak production of vector bosons as well as their constraints of effective field theory operators. Another approach to test the consistency of the electroweak sector is via precision measurements. ATLAS has published a first high precision measurement of the W boson mass, a first measurement of the tau-polarization in Z events as well as a three dimensional cross-section measurement of the Drell-Yan process. The latter allows for the extraction of the forward-backward asymmetry that can be interpreted as a measurement of the weak mixing angle. These results will be presented and discussed.
E-mail: [email protected]
Collaboration name: ATLAS Collaboration
Particle and Nuclear Astrophysics / 196
Results from ANITA
Author: Cosmin Deaconu1
1 UChicago / KICP
Corresponding Author: [email protected]
The ANtarctic Impulsive Transient Antenna (ANITA) long-duration balloon payload searches for Askaryan radio emission from ultra-high-energy (> 1018 eV) neutrinos interacting in Antarctic ice. ANITA is also sensitive to geomagnetic radio emission from extensive air showers. After a brief overview of the experiment, this talk will detail recently released results from the third flight of ANITA. Updates will also be provided on ongoing analysis of ANITA-IV and future plans. The most sensitive search from ANITA-III identified one neutrino candidate with an a priori background +0.5 estimate of 0.7−0.3. When combined with previous flights, ANITA sets the best limits on diffuse neu- trino flux at energies above ∼ 1019.5 eV. While the candidate is consistent with the pre-unblinding background estimate, a neutrino interpretation of the event remains plausible even after being sub- jected to post-unblinding examination. Additionally, ANITA-III searches identified nearly 30 exten- sive air shower candidates. One such event appears to correspond to an upward-going air shower similar to an event from ANITA-I. A tau neutrino could induce an upward-going air shower, but this interpretation is inconsistent with limits from other experiments and, due to the implied path length through the Earth, potentially in tension with the Standard Model’s predicted neutrino-nucleon cross-section.
E-mail: [email protected]
Collaboration name: ANITA
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Neutrino Masses and Neutrino Mixing / 180
Project 8: Cyclotron Radiation Emission Spectroscopy, a New Tech- nique in Direct Neutrino Mass Measurement
Author: Ali Ashtari Esfahani1
1 University of Washington
Corresponding Author: [email protected]
Project 8 has demonstrated Cyclotron Radiation Emission Spectroscopy (CRES) as a novel technique for performing electron spectroscopy. Applying this method to highest energy electrons from tri- tium beta decay will lead to a direct neutrino mass measurement. A proof of this concept was per- formed with a waveguide detector utilizing conversion electrons from 83mKr monoenergetic lines. The demonstrator has expanded our knowledge of rich spectral features in CRES signals. Asanext step, we have upgraded our hardware to meet the requirements for a demonstration with tritium. Here I present both the hardware and analysis progress which will lead us to the first continuous spectrum measurement.
E-mail: [email protected]
Collaboration name: Project 8
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 71
Overview of Experimental Data on the Neutron-Matter Equation of State and the Neutron Skins of 48Ca and 208Pb
Author: Seamus Riordan1
1 Argonne National Laboratory
Corresponding Author: [email protected]
The equation of state for asymmetric nuclear systems is a critical input for modeling a broadrange of systems spanning from asymmetric nuclei to extremes such as neutron stars. Now, with the ad- vent of gravitational wave astronomy there are new and exciting opportunities to test how these nuclei, measured on earth, connect to their astrophysical counterparts. Within nuclei, several ob- servables are available that are sensitive to this information including the size of the neutron skins, the isovector electric dipole polarizabilities, and heavy ion isospin transport. Neutron skins in par- ticular are notoriously difficult to observe with high precision: the standard tool of electromagnetic interactions that has been used to map out the nuclear charge distributions is simply insensitive to neutrons. Fortunately, nature provides a novel way to image this side of the nucleus: through fundamental weak force interactions, which interact primarily to neutrons rather than protons. In this talk I will review the status of the data that constrains the neutron matter equation of state and in particular discuss neutron densities, how one measures them with electron beams, and the recent and upcoming experimental efforts for such measurements.
E-mail:
Page 8 CIPANP 2018 - Thirteenth Conference on the Intersections of Particle … / Book of Abstracts [email protected]
Funding source: U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract numberDE- AC02-06CH11357.
Dark Matter / 58
Search for Dark Matter Decay of the Free Neutron from the UCNA Experiment: n → χ + e+e−
Author: Christopher Swank1
1 Caltech
Corresponding Author: [email protected]
The neutron lifetime is currently measured by two different types of experiments: “beam” and“bot- tle”. These two measurement techniques have a 4σ discrepancy in measured lifetime. It has been proposed recently that a previously unobserved neutron decay branch to a dark matter particle (χ) could account for the discrepancy in the neutron lifetime observed in experiments that use two dif- ferent measurement techniques. One of the possible final states discussed includes a single χ along with an e+e− pair. We use data from the UCNA (Ultracold Neutron Asymmetry) experiment to set limits on this decay channel. Coincident electron-like events are detected with ≈ 4π acceptance using a pair of detectors that observe a volume of stored Ultracold Neutrons (UCNs). The summed kinetic energy (Ee+e− ) from such events is used to set limits, as a function of the χ mass, on the branching fraction for this decay channel. For χ masses consistent with resolving the neutron life- time discrepancy, we exclude this as the dominant dark matter decay channel at ≈ 5σ level for 100 + − keV < Ee+e− < 644 keV. If the χ+e e final state is not the only one, we set limits on its branching −4 fraction of < 10 for the above Ee+e− range at > 90% confidence level.
E-mail: [email protected]
Collaboration name: UCNA Collaboration
Funding source: DOE, NSF
HFCKM / PPHI / 218
B → πℓℓ and B → Kℓℓ Decay Form Factors from Lattice QCD
Author: Yuzhi Liu1
1 Indiana University Bloomington
Corresponding Author: [email protected]
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A review of recent lattice QCD calculations of the exclusive rare B decay form factors is presented. Special focus is given to B → πℓℓ and B → Kℓℓ decays. These flavor-changing-neutral-current processes provide theoretically clean windows into physics beyond the Standard Model.
E-mail: [email protected]
Physics at High Energies / 281
Recent Developments in Higgs Physics Precision Calculations
Author: Tobias Neumann1
1 Illinois Tech / Fermilab
Corresponding Author: [email protected]
During recent years calculations including fixed order approximations and resummation have de- creased theoretical uncertainties on Higgs cross sections tremendously. Most exciting results have been published just this year. I present an overview of recent and most recent developments in Higgs precision physics calculations that allow theory predictions to compete with experimental precision reached by future collider upgrades.
E-mail: [email protected]
Particle and Nuclear Astrophysics / 197
Precision Constraints on Nuclear and Neutrino Reactions via Big Bang Nucleosynthesis
Author: Mark Paris1
Co-authors: Chad Kishimoto 2; Daniel Blaschke 1; Evan Grohs 1; George Fuller 3; Luke Johns 4; Shashank Shalgar 1; Vincenzo Cirigliano 1
1 Los Alamos National Laboratory 2 University of San Diego 3 University of California, San Diego 4 UC San Diego
Corresponding Author: [email protected]
Astronomical observations of high precision (Neff,YP , ωb,D/HP , Σmν ) may soon over determine the cosmological standard model. An effort to constrain physics beyond the standard model with these observations is faced with the challenge of the interrelated problems of neutrino transport (via the quantum kinetic equations) and a stiff nuclear reaction network. We overview work on this topic, highlighting recent advances in our understanding of neutrino flavor evolution in the presence of their collisions with each other and matter in the early universe. We demonstrate, by concurrent solution of the neutrino and matter plasma evolution, percent-level effects on predicted deuterium abundances due to non-equilibrium distortions of the neutrino spectra, an order of magnitude larger
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than previous estimates. Preliminary results for coherent neutrino flavor evolution in the presence of collisions are also discussed.
E-mail: [email protected]
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 231
Neutron Skins and Neutron Star Properties
Author: Farrooh Fattoyev1
1 Indiana University
Corresponding Author: [email protected]
The neutron skin thickness of medium to heavy nuclei provides a fundamental link between nuclear structure and neutron star properties via the equation of state of neutron-rich matter. In particu- lar, it is strongly correlated with the pressure of a pure neutron matter which pushes against the surface tension thus allowing a finite nucleus to form a neutron skin. It is precisely this same pres- sure that supports a neutron star against gravitational collapse and therefore has a direct influence on the neutron-star radii, moments of inertia, tidal deformabilities, crust-core transition properties, transport properties, particle compositions and nuclear pasta phases. In this talk, I will present an overview of our recently published works on these topics. Notably, I confront the first model- independent experimental neutron skin thickness result obtained by the pioneering Lead Radius Experiment (“PREX”) at the Jefferson Laboratory against the neutron star tidal deformability that was recently measured in the historical first detection of gravitational waves from a binary neutron star merger by the LIGO-Virgo Collaboration. I will also discuss observational implications of the up- coming measurements of the neutron skin thickness by the PREX-II and CREX experiments.
E-mail: [email protected]
Funding source: U.S. Department of Energy Office of Science Awards No. DE-FG02-87ER40365No (Indiana University), No. DE-SC0018083 (NUCLEI SciDAC-4 Collaboration)
Dark Matter / 21
Dark Decay of the Neutron
Authors: James Cline1; Jonathan Cornell1
1 McGill University
Corresponding Author: [email protected]
New decay channels for the neutron into dark matter and other particles have been suggested for explaining a long-standing discrepancy between the neutron lifetime measured from trapped neu- trons versus those decaying in flight. Many such scenarios are already ruled out by their effects on neutron stars, and the decays into dark matter plus photon or electron-positron pair have been experimentally excluded. In this talk, I will present a scenario in which the neutron decays into two invisible particles: a dark Dirac fermion and a dark photon. This setup can be consistent with all
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constraints if the fermion is a subdominant component of the dark matter. I will discuss the lim- its on the model’s parameter space that are derived from the existence of two solar mass neutron stars, direct and indirect dark matter detection, supernova observations, and cosmological consider- ations.
E-mail: [email protected]
Neutrino Masses and Neutrino Mixing / 225
Recent Borexino Measurements of Solar Neutrinos from the pp- Chains with Prospects for Detection of CNO Neutrinos
Author: Frank Calaprice1
1 Princeton University
Corresponding Author: [email protected]
Borexino is a 300-ton liquid scintillator detector located in the Gran Sasso Underground Laboratory in Italy. This detector has been taking solar neutrino data for the past ten years, and recently com- pleted new measurements of the pp, pep, 7Be, and 8B solar neutrinos. The data comprise the most complete direct experimental confirmation of Bethe’s 1939 theory of the pp-chains of nuclear reac- tions that produce the Sun’s energy. The new data also confirm a feature of the MSW theoryof neutrino oscillations which predicts a transition from “vacuum oscillations” to “matter effect oscilla- tions” over the solar neutrino energy spectrum. Experimental methods that achieved the ultra-low backgrounds necessary for these results will be described, as will continuing research toward lower backgrounds for a possible future observation of CNO neutrinos.
E-mail: [email protected]
Collaboration name: Borexino
Funding source: NSF
Physics at High Energies / 274
Neutrino Masses from a Pseudo-Dirac Bino and Its LHC Implica- tions
Author: Seyda Ipek1
Co-author: Pilar Coloma 2
1 UC Irvine 2 Fermilab
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Corresponding Author: [email protected]
We know neutrinos have mass, but we don’t know how they get their masses. Many models augment the Standard Model with right-handed neutrinos, either Dirac or Majorana, to generate the neutrino masses. I will show that in R-symmetric supersymmetric models, the bino and its Dirac partner the singlino can play the role of right-handed neutrinos. In this mechanism the neutrino masses are generated in a very simple fashion. I will discuss interesting signatures of this model at high energy colliders.
E-mail: [email protected]
Dark Matter / 99
Composite Dark Matter
Author: Enrico Rinaldi1
1 RIKEN-BNL
Corresponding Author: [email protected]
Models of composite dark matter, originating from a new strongly coupled dark sector, have avery interesting phenomenology for particles with mass around the hundreds of GeVs. To make robust predictions in these models one often needs to investigate non-perturbative effects due to the strong self interactions. Lattice field theory methods and numerical simulations are well suited for thistask and contribute to a solid uncertainty quantification. I will review the advances of lattice field theory techniques relevant for searches of dark matter particles.
E-mail: [email protected]
Particle and Nuclear Astrophysics / 68
Neutrinos from Beta Processes in Presupernovae
Author: Kelly Patton1
Co-authors: Cecilia Lunardini 2; F. X. Timmes 2; Robert Farmer 3
1 University of Washington/Institute for Nuclear Theory 2 Arizona State University 3 University of Amsterdam
Corresponding Author: [email protected]
We present calculations of the neutrino emissivities and energy spectra from massive stars in the lead up to their explosion as supernovae (presupernovae). Results from the stellar evolution code MESA are used to calculate the neutrino emissivity due to thermal and beta processes. In particular, the beta processes are modeled in detail using a network of 204 isotopes. We show that the contribution of beta processes is substantial, especially in the high energy tail of the spectrum, at E > 3-4 MeV.
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For a star at D = 1 kpc, we find that a 17 ton liquid scintillator detector would observe several tens of events from a presupernova.
E-mail: [email protected]
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 166
Nuclear-Matter Equation of State from Chiral Effective Field The- ory
Author: Christian Drischler1
Co-authors: Achim Schwenk 2; Kai Hebeler 2
1 University of California, Berkeley and Lawrence Berkeley National Laboratory 2 Technische Universitaet Darmstadt
Corresponding Author: [email protected]
Nuclear matter is an ideal testbed for nuclear interactions with important consequences for nuclear astrophysics as well as finite nuclei. In particular, recent ab initio calculations of medium-mass to heavy nuclei have demonstrated the importance of realistic saturation properties of infinite matter for nuclear forces. We present an efficient Monte-Carlo framework for perturbative calculations of infinite nuclear mat- ter based on two-, three-, and four-nucleon forces derived within chiral effective field theory. It enables to incorporate all many-body contributions in a transparent and also straightforward way, making it well-suited for pushing the limits of current state-of-the-art calculations to high orders in both the chiral as well as the many-body expansion. Furthermore, uncertainty estimates can be systematically extracted by order-by-order calculations, which provides important insights into the rate of convergence of each of the two expansions. After demonstrating its versatility, we make use of this novel framework to explore newchiralin- teractions up to next-to-next-to-next-to-leading order (N3LO) and study the equation of state of neutron and symmetric nuclear matter. Remarkably, simultaneous fits to the triton and to satura- tion properties can be achieved with natural 3N low-energy couplings. Taking advantage of the framework’s efficacy, future chiral potentials may be optimized with respect to empirical saturation properties.
E-mail: [email protected]
HFCKM / PPHI / 282
Search for LNV by the NA48 Experiment
Author: Cristina Biino1
1 INFN Torino
Corresponding Author: [email protected]
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In 2003–2004 the NA48/2 experiment at CERN collected a large sample of charged kaon decays to final states with multiple charged particles. A new upper limit on the rate of the lepton number violating decay K± → π∓µ±µ± is reported: B(K± → π∓µ±µ±) < 8.6 × 10−11 at 90% CL. Searches for two- body resonances X in K± → πµµ decays (such as heavy neutral leptons N4 and inflatons χ) are also presented. In the absence of signals, upper limits are set on the products of branching fractions B(K± → µ±N4) · B(N4 → πµ) and B(K± → π±X) · B(X → µ+µ−) for ranges of assumed resonance masses and lifetimes. The limits are in the (10−11, 10−9) range for resonance lifetimes below 100 ps.
E-mail: [email protected]
Collaboration name: NA48 Collaboration
Funding source: INFN
Neutrino Masses and Neutrino Mixing / 286
Solar and Supernova Neutrino Detection in the Deep Underground Neutrino Experiment
Author: Erin Conley1
1 Duke University
Corresponding Author: [email protected]
The Deep Underground Neutrino Experiment (DUNE) is an upcoming experiment dedicated tothe study of neutrino oscillation physics, nucleon decay, and supernova neutrinos. Understanding the physics of how massive stars die will lead to a better understanding of the creation of elements, properties of neutrinos, and constraints on beyond-the-Standard-Model physics. Neutrinos carry a majority of the core-collapse energy; thus, these neutrinos provide crucial information about the su- pernova. Solar and supernova neutrinos have much lower energies (few to 10s of MeV energy range) than those studied in the rest of DUNE’s physics program. In order to extract as much information about our sun or a future supernova as possible, the DUNE collaboration has initiated various Monte Carlo simulation studies to study detector response and reconstruction ability, in order to optimize the DUNE neutrino detectors for low-energy physics. These studies improve expectations for solar and supernova neutrinos, advance the low-energy neutrino physics field, and prepare the DUNE detectors to detect these neutrinos under the most optimal circumstances.
E-mail: [email protected]
Collaboration name: Deep Underground Neutrino Experiment
Funding source: DOE
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Neutrino Masses and Neutrino Mixing / 276
The Myriad Wonders and Challenges of Gd-Loading in WC Detec- tors
Author: Mark Vagins1
1 Kavli IPMU/UC Irvine
Corresponding Author: [email protected]
The benefits and difficulties of enriching water Cherenkov detectors with water-soluble gadolin- ium compounds — thereby enabling the detection of thermal neutrons and dramatically improv- ing these devices’ performance as detectors of supernova and reactor antineutrinos — will be dis- cussed.
E-mail: [email protected]
HFCKM / PPHI / 96
Search for K+ → π+νν at CERN
Author: Bob Velghe1
1 TRIUMF
Corresponding Author: [email protected]
The decay K+ → π+νν, with a very precisely predicted branching ratio of less than 10−10, is one of the best candidates to reveal indirect effects of new physics at the highest mass scales. TheNA62 experiment at the CERN SPS is designed to measure the branching ratio of the K+ → π+νν with a decay-in-flight technique, novel for this channel. NA62 took data in 2016, 2017 and another yearrun is scheduled in 2018. Statistics collected in 2016 allows NA62 to reach the Standard Model sensitivity for K+ → π+νν, entering the domain of 10−10 single event sensitivity and showing the proof of principle of the experiment. The analysis data is reviewed and the preliminary result from the2016 data set presented.
E-mail: [email protected]
Collaboration name: NA62
Dark Matter / 359
Sexaquark Dark Matter
Author: Glennys Farrar1
1 NYU
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Corresponding Author: [email protected]
A stable sexaquark (S) composed of uuddss is a compelling Dark Matter candidate and would not have been discovered in accelerator experiments to date. I will briefly review its particle properties, why the S would have eluded searches for an H-dibaryon, and analyses of Upsilon decay and LHC data suitable to discovering it (as are now underway by BABAR, Belle, CMS and LHCb). The main focus of the talk will be direct detection constraints on S Dark Matter, and two major cosmological consequences: predicted ΩDM /Ωb = 4.5−6, in excellent agreement with the 5.3±0.1 observed, and 7Li abundance in agreement with observation (which is ∼ 10σ below the standard LCDM prediction). For the relevant parameter space of S interactions with nucleons via ω–ϕ and f0 meson exchange, the Born Approximation does not apply. This requires a complete re-evaluation of Direct Detection experiments, as will be reported. Time permitting, possible additional astrophysical consequences will be discussed.
E-mail: [email protected]
Physics at High Energies / 283
Modification of Higgs Pair Production at the LHC
Author: Aniket Joglekar1
1 UC Riverside
Corresponding Author: [email protected]
The Higgs pair production in gluon fusion is a sensitive probe of Beyond-Standard Model(BSM) phenomena and its detection is a major goal for the LHC and higher energy hadron collider exper- iments. We reanalyze the possible modifications of the Higgs pair production cross section within low energy supersymmetry models allowed by the current LHC search bounds, where we analyze the combined effects of a modification of the Higgs trilinear and top-quark Yukawa couplings onthe di-Higgs production rate in presence of stops. We also explore the implications of such modification of the cross-section in the context of discovering the deviation in the triple Higgs coupling from the SM value, which is correlated with First order phase transitions of the scalar potential in many models, e.g. NMSSM.
E-mail: [email protected]
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 115
Constraining Ab Initio Models and the Nuclear Force with Rare Isotopes
Author: Rituparna Kanungo1
1 Saint Mary’s University
Corresponding Author: [email protected]
Our Universe has a wide variety of visible matter. An important fundamental question is how nature combines the building blocks, protons and neutrons, to form the large variety of complex many-body
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nuclei. Addressing this question requires synthesizing observed properties of nuclei and predictions from theoretical models built with knowledge of the nuclear force. A complete understanding of the nuclear force remains a challenge. A major advance in this front has been the description of the nuclear force based on the chiral effective field theory. However, there are different prescriptions of the chiral interactions that need to be constrained with experiments. Rare isotopes with neutron-proton asymmetry bring in additional sensitivity in defining the force and constraining the models. This presentation will discuss how experimental investigations of static ground state nuclear properties such as masses and radii and dynamic observables such as excitation spectra and diffraction pattern in nuclear scattering have unfolded new understanding of the ab initio models, the nuclear forces and exhibited the crucial importance of the three-nucleon force. An outlook on future experimental prospects with rare isotopes will be presented together with the need for ab initio theoretical developments.
E-mail: [email protected]
Particle and Nuclear Astrophysics / 159
Multi-Angle Simulations of Matter-Neutrino Resonance
Author: Alexey Vlasenko1
Co-author: Gail McLaughlin 1
1 North Carolina State University
Corresponding Author: [email protected]
Neutrino flavor transformation in compact object mergers can be dominated by matter-neutrino resonances (MNRs). By efficiently converting electron neutrinos to other species, MNRs can affect nucleosynthesis and the dynamics of the merger. Prior to our work, calulations of MNR have used the single-angle approximation, only following flavor evolution along a single neutrino trajectory. However, self-consistency requires that all trajectories be treated simultaneously. It was not known whether MNR phenomena would be present in a multi-angle model, or whether they were merely an artifact of the single-angle approximation. We present the first fully multi-angle calculations of MNR, finding that some familiar features of single-angle MNR are still present. However, there are qualitative differences compared to the single-angle results. We show that the type offlavor transformation seen in multi-angle MNR is extremely robust, occurring with relatively little change under a wide variety of physical conditions. This suggests that neutrino flavor transformation dueto MNR can play an important role in merger environments, and does not strongly depend on detailed assumptions about the matter distribution, neutrino spectrum or composition.
E-mail: [email protected]
Funding source: U.S. Department of Energy, Office of Science, Office of Nuclear Physics
HFCKM / PPHI / 198
The MEG Experiment: Run I Final Results and Preparation for Run II
Page 18 CIPANP 2018 - Thirteenth Conference on the Intersections of Particle … / Book of Abstracts
Author: Terence Libeiro1
1 UCI
Corresponding Author: [email protected]
The MEG experiment at the Paul Scherrer Institut searches for charged lepton flavor violation inthe rare muon decay µ+ → e+ + γ. The first run during the 2009–13 period excludes the decay process at the sensitivity limit of 4.2 × 10−13 at 90% confidence level. An upgrade of the experiment, MEGII, is underway with the aim to improve the sensitivity by an order of magnitude. We discuss the moti- vation and the analysis strategy for the search followed by a description of the new detectors, novel components and design of the existing detectors, and new calibration techniques. In preparation for the second run (2018–21), scheduled to start at the end of this year, we review the status of the current upgrades and conclude with the expected sensitivity of the MEGII experiment.
E-mail: [email protected]
Collaboration name: MEG
Dark Matter / 331
Experimental Signatures of Ultra-Light Dark Matter
Author: Surjeet Rajendran1
1 UC Berkeley
Corresponding Author: [email protected]
Observational limits on the mass of dark matter are weak — they allow the mass of dark matterto be anywhere from 10−22 eV – 1048 GeV. In this talk, I will focus on ultra-light dark matter in the mass range 10−22 eV – 10−5 eV. A number of well motivated dark matter candidates such as axions inhabit this vast parameter space. Even though these candidates emerge from a number of models, there are only four possible experimental signatures of these models: they can drive currents in circuits, lead to spin precession, exert forces on particles, and change the values of fundamental constants. All of these effects can be experimentally probed using precision magnetometry and interferometry.
E-mail: [email protected]
Neutrino Masses and Neutrino Mixing / 140
First 0νββ Decay Search Results from CUORE and Status of CU- PID R&D
Author: Bradford Welliver1
1 LBNL
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Corresponding Author: [email protected]
The Cryogenic Underground Observatory for Rare Events (CUORE) is a large neutrinoless double beta (0νββ) decay search experiment currently taking data at the Laboratori Nazionali del Gran Sasso (LNGS). Such searches can address fundamental questions that remain about the nature of the neutrino such as the mass hierarchy, whether they are Majorana fermions, and may present new physics beyond the Standard Model via lepton number violation. CUORE is the most massive array of crystal bolometers in the world containing a total of 988 TeO2 crystals (742 kg) with an expected sensitivity to the 130Te 0νββ half-life of 9 × 1025 years (90% C.L.) after 5 years of operation. This talk will discuss the recently published CUORE limit on the 130Te 0νββ half-life, T > 1.3 × 1025 years (90% C.L.), as well as the current status of CUORE. Additionally an overview of the current state of R&D towards the proposed next generation experiment, CUORE Upgrade with Particle ID (CUPID), will be presented.
E-mail: [email protected]
Collaboration name: CUORE Collaboration
Funding source: US Department of Energy, Office of Science, Nuclear Physics
QCD, Hadron Spectroscopy, and Exotics / 14
Model Independent Constraints on R(J/ψ)
Author: Henry Lamm1
1 University of Maryland
Corresponding Author: [email protected]
BR + → + BR + → LHCb has recently presented a measurement of R(J/ψ) = (Bc J/Ψτ ν¯τ )/ (Bc + J/Ψµ ν¯µ). The value, R(J/ψ) = 0.71 ± 0.17 ± 0.18 is in mild tension with the range of model predictions 0.25-0.28. The model transition form factors dominate the systematic uncertainty of the measurement and limit the predictions to a range of values. To improve this situation, we have undertaken to compute model-independent constraints on the transitions form factors via dispersive methods. This allow for rigorous error estimates to be assigned and R(J/ψ) to be computed.
E-mail: [email protected]
Funding source: DE-FG02-93ER-40762
Tests of Symmetries and the Electroweak Interaction / 252
EDMs: Theory Overview
Author: Emanuele Mereghetti1
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1 LANL
Corresponding Author: [email protected]
Electric dipole moments (EDMs) are extremely sensitive probes of physics beyond the Standard Model (SM). A vibrant experimental program is in place, with the goal of improving existing bounds on the electron and neutron EDMs by one/two orders of magnitude, while testing new ideas for the measurement of EDMs of light ions, such as the proton and the deuteron, at a comparable level. The success of this program, and its implications for physics beyond the SM, relies on theprecise calculation of the EDMs in terms of the couplings of CP-violating operators, induced by BSM physics in the QCD Lagrangian. In light of the non-perturbative nature of both QCD at low energy and of the nuclear interactions, these calculations have proven difficult, and are affected by large theoretical uncertainties. In this talk I will review the progress that has been achieved on different aspects of the calculation of hadronic and nuclear EDMs, the challenges that remain to be faced, and the implications for our understanding of physics beyond the SM.
E-mail: [email protected]
Physics at High Energies / 45
Measurements and Searches of Higgs Boson Decays to Two Fermions
Author: Tatsuya MASUBUCHI1
1 The University of Tokyo, International Center for Elementary Particle Physics
Corresponding Author: [email protected]
Measurements and searches of Higgs boson decays to two third- or two second-generation quarks or leptons are presented using 36 fb−1 of pp collision data collected at 13 TeV.
E-mail: [email protected]
Collaboration name: ATLAS Collaboration
Tests of Symmetries and the Electroweak Interaction / 191
Worldwide Search for a Neutron EDM
Author: brad filippone1
1 caltech
Corresponding Author: [email protected]
Existing limits on the electric dipole moment (EDM) of the free neutron have provided critical con- straints on new sources of CP violation for more than 60 years. A new round of searches are actively
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underway with the goal of improving the sensitivity to CP violation by up to two orders of magni- tude. The status of these new searches will be discussed, including recent progress on thenEDM experiment to be carried out at the Fundamental Neutron Physics Beamline at the Oak Ridge Na- tional Laboratory’s Spallation Neutron Source.
E-mail: [email protected]
Funding source: NSF 1506459
Dark Matter / 273
Recent Results from the Axion Dark Matter Experiment (ADMX)
Author: Gianpaolo Carosi1
1 Lawrence Livermore Natl Lab
Corresponding Author: [email protected]
The nature of dark matter is one of the great mysteries of modern physics today and islikelynew particles beyond the Standard Model. The Axion, originally conceived as a solution to the strong-CP problem in nuclear physics, is one well-motivated candidate. The Axion Dark Matter Experiment (ADMX) was started at LLNL in the mid-1990s and ran until 2010 before it was moved to the U. of Washington where it is now a DOE Gen 2 project. ADMX uses a large microwave cavity immersed in a strong static magnetic field to resonantly convert dark matter axions to detectable photons. Recently ADMX has completed its first data run with unprecedented sensitivity in the classical QCD- axion mass range of several µeV. In this talk I will describe the history of axion dark matter searches, describe the recent ADMX results, and give a survey of the R&D efforts currently underway to explore the entire axion dark matter mass window.
E-mail: [email protected]
Collaboration name: ADMX collaboration
Funding source: DOE Office of Science HEP Cosmic Frontier
QCD, Hadron Spectroscopy, and Exotics / 141
Implication of Chiral Symmetry on the Heavy-Light Spectroscopy
Author: Meng-Lin DU1
1 Helmholtz-Institut f\”ur Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universit\”at Bonn
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Corresponding Author: [email protected]
For a long time, the quark model has served as an ordering scheme and brought systematics into the hadron zoo. However, many new hadrons that were observed since 2003, including the lowest- ⋆ lying positive-parity charm-strange mesons Ds0(2317) and Ds1(2460), do not conform with quark model expectations. Various modifications to the quark model and alternative approaches havebeen proposed ever since to explain their low masses and decay properties. We demonstrate that if the lightest scalar (axial vector) states are assumed to owe their existence to non-perturbative π/η/K − (⋆) (⋆) D /Ds scattering, various puzzles in the D-meson spectrum get resolved. Most importantly the ordering of the lightest strange and non-strange scalars becomes natural. We show the well constrained amplitudes for Goldstone-Boson−D/D⋆ scattering are fully consistent with recent high quality data on B− → π−π−D+ final states. This implies that the lowest quark-model positive- parity charm mesons, together with their bottom cousins, if realized in nature, do not form the ground-state multiplet. This is similar to the pattern that has been established for the scalar mesons made from light up, down and strange quarks, where the lowest multiplet is considered to be made of states not described by the quark model. In a broader view, the hadron spectrum must be viewed as more than a collection of quark model states.
E-mail: [email protected]
Physics at High Energies / 46
Evidence for Higgs Boson Production in Association with a tt¯ Pair
Author: Jannik Geisen1
1 II. Physikalisches Institut, Georg-August-Universitaet Goettingen
Corresponding Author: [email protected]
The search for the production of the Higgs Boson with a pair of tt¯ quarks is both very important and very challenging. This talk presents the analyses using Higgs boson decays to b¯b pairs, to two Z bosons, to other multi-lepton final states, and to a pair of photons, using 36fb−1 of pp collision data collected at 13 TeV, as well as their combined results.
E-mail: [email protected]
Collaboration name: ATLAS Collaboration
Neutrino Masses and Neutrino Mixing / 62
Status and Initial Results of the Majorana Demonstrator
Author: Wenqin Xu1
1 University of South Dakota
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Corresponding Author: [email protected]
Located at the 4850’ level of the Sanford Underground Research Facility (SURF), the Majorana Demon- strator (MJD) experiment is searching for neutrinoless double beta (0νββ) decay in 76Ge with high- purity Germanium (HPGe) detectors. The initial goals of the Demonstrator are to establish there- quired background and scalability of a ton-scale Ge-based experiment. The construction and commissioning of the Demonstrator has been completed and the multiple-year data-taking has started. Initial results from the first physics run has demonstrated an unprecedented energy resolution of 2.5 keV FWHM at Qββ and an ultra-low background that is consistent with the background goals. The initial 10 kg·yr of enriched Ge exposure resulted in a lower limit on the 0νββ decay half-life of 1.9×1025 yr (90% CL). In this talk, we will discuss the status of the Majorana Demonstrator, the recent physics results, and the implications and status of the LEGEND ton-scale Ge-based neutrinoless double-beta decay program.
E-mail: [email protected]
Collaboration name: Majorana Collaboration
Funding source: Department of Energy and the National Science Foundation
HFCKM / PPHI / 156
The Mu2e Experiment
Author: Tomonari Miyashita1
1 Caltech
Corresponding Author: [email protected]
The Mu2e experiment at Fermilab aims to measure the neutrinoless conversion of a negative muon into an electron, a reaction violating charged lepton flavor conservation. This process is extremely suppressed in the Standard Model, and an observation would constitute an unambiguous sign of new physics beyond the Standard Model. The conversion signal is characterized by a monochromatic electron with an energy slightly below the rest mass of the muon (104.97 MeV). We expect to reach a single event sensitivity on the ratio between the muon conversion and capture rate in aluminum of 3 × 10−17 at 90% CL after three years of data taking. We present an overview of the theory and motivation for the Mu2e experiment, our experimental design, and the current status of the experiment. We also provide a brief summary of the proposed Mu2e-II experiment that would provide a factor of 10 improvement in sensitivity over Mu2e.
E-mail: [email protected]
Collaboration name: Mu2e
Tests of Symmetries and the Electroweak Interaction / 205
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Towards TUCAN’s Search for the Neutron Electric Dipole Moment
Author: Wolfgang Schreyer1
1 TRIUMF
Corresponding Author: [email protected]
TUCAN (TRIUMF ultracold advanced neutron source) is a transpacific collaboration with the objec- tive to measure the neutron electric dipole moment (nEDM) with unprecedented precision. We aim at a precision of 10−27 e.cm, an improvement by a factor of 30 over the current upper limit for this elusive quantity. A non-zero nEDM violates parity and time-reversal symmetry, and is thus inti- mately linked to the baryon asymmetry of the universe. The tool of choice to search for an nEDM are ultracold neutrons (UCN) that move at velocities of only a few meters per second and can be stored and observed for up to hundreds of seconds. TUCAN recently completed a major milestone: production of the first UCN in Canada by operating a prototype source, developed at RCNP Osaka, Japan, at a dedicated proton beam line at TRIUMF, Vancouver, Canada. This source is based on a neu- tron spallation source combined with a superfluid helium cryostat – a unique approach among the handful of worldwide efforts to produce significant densities of UCN for nEDM searches andother high precision experiments. This presentation will describe TUCAN’s current efforts and timeline towards design, implementation, and commissioning of the required next-generation UCN source and nEDM spectrometer.
E-mail: [email protected]
Collaboration name: TUCAN Collaboration
Funding source: NRC, NSERC, CFI, JPS, JSPS.
Dark Matter / 357
Status and Future Plans for the HAYSTAC Experiment
Author: Karl van Bibber1
1 University of California Berkeley
Corresponding Author: [email protected]
HAYSTAC (Haloscope At Yale Sensitive To Axion CDM) is a microwave cavity experiment designed both as a data pathfinder and innovation test-bed, in the 3–12 GHz (12–50 µeV) mass range. The Phase I run program (2016–17) covered a small region of mass around 24 µeV, achieving a sensi- tivity in axion-photon coupling well into the range of realistic axion models for a standard halo density. With a tunable annular copper cavity of only 1.5 L volume in a 9 T superconducting magnet, HAYSTAC achieved a system noise temperature of only 2× the Standard Quantum Limit (kBTSYS = hν), an order of magnitude improvement over any other experiment; its extraordinary sensitivity owing to the first-ever use of Josephson Parametric Amplifiers (JPA) and a dilution re- frigerator in a microwave cavity experiment. Currently, a 2-JPA squeezed-vacuum state receiver is being integrated into the experiment that will enable a significant speed up of data taking; com- missioning will begin early summer. Innovations in microwave resonators will also be described, such as Photonic Band Gap structures to eliminate interference from unwanted TE-modes with the TM010-like mode of interest, which couples to the axion field.
E-mail:
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Collaboration name: HAYSTAC
Funding source: This work was supported by the National Science Foundation, under grants PHY-1362305 andPHY- 1607417, by the Heising-Simons Foundation under grants 2014-181, 2014-182, and 2014-183, and by the U.S. Department of Energy through Lawrence Livermore National Laboratory under Contract DE-AC52- 07NA27344.
Physics at High Energies / 44
Measurement of Cross Sections and Properties of the Higgs Bo- son in Decays to Bosons Using the ATLAS Detector
Author: Lucrezia Stella Bruni1
1 NIKHEF
Corresponding Author: [email protected]
Measurements of Higgs boson properties and cross sections measured in Higgs boson decays to two photons, two Z bosons, and two W bosons based on pp collision data collected at 13 TeV are presented. In addition, results from the combination of different decay channels are shown.
E-mail: [email protected]
Collaboration name: ATLAS Collaboration
QCD, Hadron Spectroscopy, and Exotics / 170
Precise Measurement of the D⋆(2010)+ −D+ Mass Difference
Author: Abner Soffer1
1 Tel Aviv University
Corresponding Author: [email protected]
⋆ + + We measure the mass difference, ∆m+, between the D (2010) and the D , using the decay chain D⋆(2010)+ → D+π0 with D+ → K−π+π+. The data were recorded with the BaBar detector at center-of-mass energies at and near the Υ(4S) resonance, and correspond to an integrated luminosity −1 of approximately 468 fb . We measure ∆m+ = (140, 601.0 ± 6.8 [stat] ± 12.9 [syst]) keV. We ⋆ + 0 combine this result with a previous BaBar measurement of ∆m0 ≡ m(D (2010) ) − m(D ) to + 0 obtain ∆mD = m(D ) − m(D ) = (4, 824.9 ± 6.8 [stat] ± 12.9 [syst]) keV. These results are compatible with, and approximately five times more precise than, previous world averages.
E-mail:
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Collaboration name: BaBar
Dark Matter / 241
DM Radio: An Optimized Resonant Search for Axion and Hidden- Photon Dark Matter
Author: Saptarshi Chaudhuri1 Co-authors: Arran Phipps 1; Carl Dawson 1; Dale Li 2; Hsiao-Mei Cho 2; Kent Irwin 1; Peter Graham 1; Stephen Kuenstner 1; Surjeet Rajendran 3
1 Stanford University 2 SLAC National Accelerator Laboratory 3 University of California, Berkeley
Corresponding Author: [email protected]
We discuss DM Radio, a lumped-LC resonant search for axion and hidden-photon dark matter be- tween 100 Hz and 300 MHz. We illustrate the detection concept and discuss design and fabrication of the Pilot detector, which will operate in liquid helium at 4 K over the next three years and probe hid- den photons in a portion of this frequency range. We show results from a fixed-frequency resonator and present work on detector characterization, including a study of loss mechanisms, shielding per- formance, and dc SQUID amplifier noise. We discuss future plans to optimize DM Radio, inthe context of fundamental limitations on electromagnetic searches for light-field dark matter.
E-mail: [email protected]
Funding source: Heising-Simons Foundation, Kavli Institute for Particle Astrophysics and Cosmology, SLAC Laboratory Directed Research and Development
HFCKM / PPHI / 175
PEN Experiment: a Precise Test of Lepton Universality
Authors: Charles Glaser1; Dinko Pocanic1
1 University of Virginia
Corresponding Author: [email protected]
+ + V –A helicity suppression of the π → e ν(γ) decay (known as “πe2”) amplifies the sensitivity to pseudoscalar terms by a factor of ∼8000, enabling indirect searches for non-SM pseudoscalar terms, as well as scalar and tensor terms, through loop effects, with good sensitivity to interesting π regions of the beyond-SM parameter space (e.g., supersymmetric extensions). The ratio Re/µ = [Γ(π → eν¯(γ))]/ [Γ(π → µν¯(γ))] provides the current best limit on the universality of W coupling to the e and the µ, with broad implications, including in the neutrino sector. Recent LHCb data on 0 → ⋆ + − B K0 ℓ ℓ decays, coming on the heels of previous measurements from Belle and BaBar, have
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focused new interest on possible violation of lepton universality. The PEN collaboration is at the π −3 threshold of obtaining new results for Re/µ at sub-10 precision from measurements completed at PSI several years ago. We discuss the status of the PEN data analysis and the expected uncertainty limits, as well as complementarity with results of high-energy studies.
E-mail: [email protected]
Collaboration name: PEN Collaboration
Funding source: US National Science Foundation grants PHY-1614839, PHY-1307328.
Tests of Symmetries and the Electroweak Interaction / 258
Status of the Storage Ring Proton EDM Experiment
Author: Selcuk Haciomeroglu1
Co-author: Yannis K. Semertzidis 2
1 Institute for Basic Science, Korea 2 Institute for Basic Science
Corresponding Author: [email protected]
Charged particle EDM experiments can be done with high sensitivity using storage rings. Radial electric fields bend a longitudinally polarized beam for storage while at the same time couplewith the particle EDM. Having the so-called magic momentum, the spin precession in the horizontal plane can be frozen. Still, the spin can make a precession in the vertical plane with a rate proportional to the magnitude of the EDM (dp).
We have a preliminary ring design to make the proton EDM experiment with a sensitivity of dp = 10−29 e·cm. The EDM signal corresponds to a few nrad/s of spin precession rate in thevertical plane. There are several spin and electromagnetic field configurations that can lead to a falseEDM signal of the same order, like a net radial magnetic field and/or vertical electric field depending on the details of the ring lattice. This talk summarizes the ring design with a focus on the systematic errors.
E-mail: [email protected]
Neutrino Masses and Neutrino Mixing / 210
LEGEND: The Large Enriched Germanium Experiment for Neu- trinoless Double-Beta Decay
Author: Jordan Myslik1
1 Lawrence Berkeley National Laboratory
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Corresponding Author: [email protected]
The lepton number violating process of neutrinoless double-beta decay could result from thephysics beyond the Standard Model needed to generate the neutrino masses. Taking different approaches, the current generation of 76Ge experiments, the MAJORANA DEMONSTRATOR and GERDA, lead the field in both the ultra-low background and energy resolution achieved. The next generation of neutrinoless double-beta decay experiments requires increased mass and further reduction of back- grounds to maximize discovery potential. Building on the successes of the MAJORANA DEMON- STRATOR and GERDA, the LEGEND collaboration has been formed to pursue a tonne-scale 76Ge experiment, with discovery potential at a half-life beyond 1028 years. The collaboration aims to develop a phased neutrinoless double-beta decay experimental program, starting with a 200 kg mea- surement using the existing GERDA cryostat at LNGS. I will discuss the plans and physics reach of LEGEND, and the combination of R&D efforts and existing resources being employed to expedite physics results.
E-mail: [email protected]
Collaboration name:
LEGEND Collaboration
QCD, Hadron Spectroscopy, and Exotics / 130
Dibaryon Searches in Decuplet Baryons from Lattice QCD
Author: Shinya Gongyo1
1 RIKEN Nishina Center, RIKEN
Corresponding Author: [email protected]
In recent years, there is a renewed interest in the dibaryons due to exclusive measurements in hadron reactions as well as the direct measurement in relativistic heavy-ion collisions. In this talk, we will present the result of the dibaryon searches from lattice QCD. Particularly we focus on the study of “Most strange dibaryon”, which is composed of two Ω baryons. First, we will show the result of the 1 Ω-Ω interaction in the S0 channel at almost physical point, and then will clarify that the interaction 7 leads to a shallow bound state. We may talk about the ∆-∆ interaction in the S3 channel in the case of the heavy pion mass. In the interaction, there appears a deep bound state that is observed as a resonance of two nucleons in an experiment by the CELSIUS/WASA Collaboration. S. Gongyo et al., Most Strange Dibaryon from Lattice QCD, arXiv:1709.00654 [hep-lat], accepted in PRL.
E-mail: [email protected]
Collaboration name:
HAL QCD Collaboration
Physics at High Energies / 47
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Searches for Rare and Non-Standard Model Decays of the Higgs Boson
Author: Elliot Reynolds1
1 University of Birmingham
Corresponding Author: [email protected]
Theories beyond the Standard Model predict Higgs boson decays at amuch enhanced rate compared to the Standard Model, e.g. for decays to Z+photon, or a meson and a photon, or decays that do not exist in the Standard Model, such as decays into two light bosons (a). This talk presents recent results based on 36 fb−1 of pp collision data collected at 13 TeV.
E-mail: [email protected]
Collaboration name: ATLAS Collaboration
Tests of Symmetries and the Electroweak Interaction / 192
The Radium-225 Experiment
Author: Matthew Dietrich1
1 Argonne National Laboratory
Corresponding Author: [email protected]
Due to its large nuclear octupole deformation and high atomic mass, the radioactive isotope 225Ra is a favorable case to search for an electric dipole moment (EDM); it is particularly sensitive to CP- violating interactions in the nucleus. However, its scarcity and low vapor pressure present significant challenges. To measure this rare isotope, we have developed an approach to measuring atomic EDMs by using lasers to cool radium atoms to 40 micro-Kelvin, and then we trap those atoms in an optical dipole trap. The atoms are then allowed to precess in magnetic and strong electric fields. Usingthis method, we have found the EDM of radium to be less than 1.4 × 10−23 e-cm (95% C.L.). Upcoming improvements are expected to dramatically improve our sensitivity, and significantly improve on the search for new physics in several sectors.
E-mail: [email protected]
Funding source: Work supported by the DOE Office of Science, Office of Nuclear Physics, under contract numberDE- AC02-06CH11357.
HFCKM / PPHI / 120
Improved Search for Heavy Neutrinos and a Test of Lepton Uni- versality in the Decay π → eν
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Author: Richard Mischke1
1 TRIUMF
Corresponding Author: [email protected]
Data from the PIENU experiment at TRIUMF have been examined for evidence of a heavy neutrino coupled to the positron in the decay π → eν. Limits on the mixing of neutrinos in the mass range 60–135 MeV/c2 with the electron neutrino, which are up to an order of magnitude improvement over previous results, will be presented. The PIENU experiment was also designed to make a high-precision measurement ofthe π → eν Γ(π→eν + π→eνγ) branching ratio: Rπ = Γ(π→µν + π→µνγ) , which provides a sensitive test of lepton universality and places tight constraints on many new physics scenarios. The branching ratio analysis is in the final stages, and the status will be presented, as well as a summary of published results based on a subset of the data.
E-mail: [email protected]
Collaboration name: PIENU Collaboration
Neutrino Masses and Neutrino Mixing / 311
Deep Neural Networks for Energy and Position Reconstruction in EXO-200
Author: Manuel Weber1
1 Stanford University
Corresponding Author: [email protected]
The EXO-200 experiment is dedicated to the search of neutrinoless double beta(0νββ) decay in liquid xenon enriched in the isotope 136. A single-phase time projection chamber (TPC), containing 110 kg of active mass, is realized in an ultra-low background environment where both ionization charge and scintillation light is detected. Both channels are combined for improved energy resolution and better background rejection. Conventional multivariate analyses have been performed on thefirst two years of data with one of the most sensitive results on 0νββ decay and data taking in Phase-II is ongoing. Novel approaches of data analysis on the basis of deep learning were implemented and promising first results were achieved towards better reconstruction of events in EXO-200.
E-mail: [email protected]
Collaboration name: EXO-200
Dark Matter / 57
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ABRACADABRA: A New Approach to the Search for Axion Dark Matter
Author: Jonathan OuelletNone
Corresponding Author: [email protected]
The evidence for the existence of dark matter is well supported by many cosmological observations. Separately, long standing problems within the Standard Model point to new weakly interacting particles to help explain away unnatural fine-tunings. The axion was originally proposed to explain the strong CP problem, but was subsequently shown to be a strong candidate for explaining the Dark Matter abundance of the Universe. ABRACADABRA is a proposed experiment to search for ultralight axion Dark Matter, with a focus on the mass range −14 −6 10 < ma < 10 eV. We search for these axions and other axion-like particles (ALPs) through a modification to Maxwell’s equations, which cause strong magnetic fields to source weak oscillating electrical currents parallel to the field. In this talk, I will describe the working principle behind the ABRACADABRA experiment as well as the prototype that we are running at MIT called ABRACADABRA-10 cm.
E-mail: [email protected]
Collaboration name: ABRACADABRA
Funding source: NSF
Physics at High Energies / 259
Precision Measurements with Di-Bosons at the LHC
Authors: Da Liu1; Lian-Tao Wang2
1 Argonne National Laboratory 2 EFI, UChicago
Corresponding Author: [email protected]
Precision measurements at the LHC can provide probes of new physics, and they are complementary to direct searches. The high energy distribution of di-boson processes (W W, W Z, V h) is a promising place, with the possibility of significant improvement in sensitivity as the data accumulates. We focus on the semi-leptonic final states, and make projections of the reach for future runsofthe LHC with integrated luminosities of 300 fb−1 and 3 ab−1. We emphasize the importance of tagging the polarization of the vector bosons, in particular for the WW and WZ channels. We employ a combination of kinematical distributions of both the W and Z, and their decay products to select the longitudinally polarized W and Z. We have also included our projections for the reach using the associated production of vector bosons and the Higgs. We demonstrate that di-boson measurements in the semi-leptonic channel can surpass the sensitivity of the precision measurement at LEP, and they can be significantly more sensitive than the HL-LHC h → Zγ measurements. We have also considered the reaches on the new physics mass scale in different new physics scenarios, including the Strongly Interacting-Light Higgs (SILH), the Strongly Coupled Multi-pole Interaction (Remedios), and the class of models with partially composite fermions.
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E-mail: [email protected]
Tests of Symmetries and the Electroweak Interaction / 107
Progress on the Nucleon EDM in Lattice QCD
Author: Sergey Syritsyn1
1 Stony Brook University
Corresponding Author: [email protected]
EDM of the nucleon, whether observed or further constrained, can be traced back to various CP- violating quark and gluon effective interactions. In order to constrain these effective interactions and, subsequently, the extensions of the Standard Model, nonperturbative calculations of nucleon structure are necessary. Low-energy theories and nucleon models provide ballpark estimates for the nEDM sensitivity to CP violation at the quark/gluon level, while precise and model-independent relations between nEDM and various sources of CP violation are expected from QCD calculations on a lattice. Lattice QCD has reached a respectable level of statistical and systematic precision for hadron spectrum and simple nucleon structure observables with physical quark masses, and on the verge of producing reliable results for nucleon EDM induced by lowest-order quark-gluon operators. In this talk, I will briefly overview the current status of these calculations as well as show some recent preliminary results.
E-mail: [email protected]
QCD, Hadron Spectroscopy, and Exotics / 10
Single-Top Production in the Standard Model and Beyond
Author: Nikolaos Kidonakis1
1 Kennesaw State University
Corresponding Author: [email protected]
I present high-order calculations for single-top production in the Standard Model and in models with anomalous top-quark couplings. Theoretical results are presented for total cross sections and top- quark transverse momentum and rapidity distributions for the t and s single-top channels as well as for the associated production of a top quark with a W -boson in the Standard Model. Corrections from soft-gluon emission though NNNLO are included. I also show results for the associated produc- tion of a top quark with a Z boson in processes involving anomalous top-quark couplings.
E-mail: [email protected]
HFCKM / PPHI / 212
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RD and RD*: Theoretical Developments
Author: Ryotaro Watanabe1
1 University of Montreal
Corresponding Author: [email protected]
I will present an overview of theoretical developments on RD and RD*, in which discrepancies be- tween experimental data and the Standard Model predictions have been reported, referred to as the B anomaly. Then I will summarize New Physics explanations for the B anomaly.
E-mail: [email protected]
Dark Matter / 228
Probing Sub-GeV Dark Matter with Superfluid Helium
Author: Daniel McKinseyNone
Co-authors: Andreas Biekert 1; Junsong Lin 1; Scott Hertel 2; Vetri Velan 1
1 UC Berkeley 2 University of Massachusetts, Amherst
Corresponding Author: [email protected]
We propose a new dark matter detector that will be sensitive to nuclear recoils of sub-GeV dark matter, using superfluid helium as a target. Superfluid helium has many merits as a detector target: these include good kinematic matching to low mass dark matter, excellent intrinsic radiopurity, and its unique ability to be cooled down as a liquid to milli-Kelvin temperatures. We propose to read out the recoil signals by calorimetry based on transition edge sensor readout. Calorimeters submerged in the liquid will measure prompt scintillation photons with near-100% efficiency, while the long- lived rotons and phonon excitations will be detected by quantum evaporation of helium atoms from the liquid surface, into vacuum, and then onto a calorimeter array. The binding energy from helium absorption to the calorimeter surface allows for the amplification of these quantum evaporation signals, allowing sub-eV recoil energy thresholds. Taking into account the relevant backgrounds and detector discrimination power based on the light:heat ratio, sensitivity projections show that a small detector (∼kg scale) can already explore new parameter space.
E-mail: [email protected]
Neutrino Masses and Neutrino Mixing / 150
Status and Future for the NEXT Collaboration in Neutrinoless Double Beta Decay
Author: Sereres Johnston1
1 Argonne National Laboratory
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Corresponding Author: [email protected]
Neutrinoless double beta decay (0νββ) searches are key components of the physics program dedi- cated to understanding the nature and mass of the neutrino. The Neutrino Experiment with a high- pressure Xenon Time Projection Chamber (NEXT) collaboration uses high pressure gas xenon time projection chambers (TPCs) to demonstrate the performance and scalability of this technology as isotope masses increase with each experimental generation. I will first highlight some recent results from NEXT-White, a 5 kg-scale detector currently operating at the Laboratorio Subterraneo de Can- franc (Spain). I will then describe research and development related to NEXT-100, a 100 kg-scale detector which is the next generation of NEXT experiments and expected to take data starting in 2019.
E-mail: [email protected]
Collaboration name: NEXT Collaboration
Physics at High Energies / 291
Heavy Higgs Search in the Models with Vectorlike Fermions
Author: Seodong Shin1
Co-authors: Enrico Lunghi 2; Radovan Dermisek 2
1 University of Chicago / Yonsei University 2 Indiana University
Corresponding Author: [email protected]
I will discuss models with extended Higgs doublets and extra heavy fermions. In this scenario, a promising way of searching both the neutral heavy Higgs and vectorlike fermion signals at the LHC is observing the heavy Higgs cascade decay into a vectorlike fermion which subsequently decays into W , Z gauge bosons or the SM Higgs boson. In this talk, I will also show the signal sensitivities in the future LHC program, HL/HE-LHC.
E-mail: [email protected]
Neutrino Masses and Neutrino Mixing / 270
Search for Neutrinoless Double-Beta Decay with SNO+
Author: Vincent Fischer1
1 UC Davis
Corresponding Author: [email protected]
The SNO+ experiment, located in SNOLAB, 2 kilometers underground in the Creighton mine,near Sudbury, Canada, is a large scale neutrino detector whose main purpose is to search for neutrinoless
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double-beta decay and thus probe the Majorana nature of the neutrino. With 780 tons of liquid scin- tillator loaded with tellurium, SNO+ aims at exploring the Majorana neutrino mass parameter space down to the inverted mass hierarchy region. The versatility of the SNO+ detector also allows itto detect solar and reactor neutrinos, provide a measurement of the geoneutrino flux, detect galactic core-collapse supernovae and perform nucleon decay searches. The SNO+ experiment is currently taking data with a detector fully filled with ultrapure water. The detector will be completely filled with liquid scintillator in the coming months and subsequently loaded with tellurium. This presen- tation will describe the physics case, detector design and current status of SNO+.
E-mail: [email protected]
Collaboration name: SNO+
Tests of Symmetries and the Electroweak Interaction / 139
Search for Time Reversal Invariance Violation in Resonances of Compound Nuclei Accessible Using Epithermal Neutrons
Author: Libertad Barrón-Palos1
Co-author: NOPTREX collaboration 2
1 Universidad Nacional Autónoma de México 2 Indiana University
Corresponding Author: [email protected]
One of the main puzzles in contemporary physics is the asymmetry between matter and antimatter observed in the Universe. In our current understanding, one of the necessary ingredients to explain such asymmetry is the violation of CP (or equivalently the TRIV), however it has only been ob- served in the weak interaction and with a very small amplitude. Searches of new mechanisms of CP violation in the strong interaction are of scientific importance. In this context, the transmission of polarized epithermalneutrons in resonances of compound nuclei that exhibit large parity-violating effects offers a possibility to search for T-odd effects that constitute a null test for TRIV andthatare complementary to other searches, like the neutron EDM.
E-mail: [email protected]
Collaboration name: NOPREX Collaboration
Funding source: PAPIIT-UNAM IG101016, CONACYT 271802 and 280760.
QCD, Hadron Spectroscopy, and Exotics / 179
Measurement of Polarization Observables in the Reaction γp → K+Λ
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Author: Shankar Adhikari1
1 Florida International University
Corresponding Author: [email protected]
Spin observables are important to understand the production mechanisms of hyperons, as well as the contribution of intermediate baryon resonances. Λ polarization observables have been studied exten- sively in the recent decades using the reaction γ +p → K+ +Λ. This talk presents the measurement of transferred polarization coefficients Cx and Cz, and the induced polarization P , using a new set of high statistics data, obtained using the CEBAF Large Acceptance Spectrometer (CLAS) detector at Jefferson Lab. The photon beam energy range is 1.117 to 5.45 GeV. These results(Cx,Cz and P ) are extracted simultaneously using the Maximum Likelihood Method. The measurements for Cx and Cz have nearly an order of magnitude increase in events compared to previously published results and also extend the kinematic range for W > 2.54 GeV, important for both the search for high-mass nucleon states as well as to provide information about non-resonant contributions.
E-mail: [email protected]
Dark Matter / 184
The Light Dark Matter eXperiment
Author: Omar Moreno1
1 SLAC National Accelerator Laboratory
Corresponding Author: [email protected]
The Light Dark Matter eXperiment (LDMX) proposes a high-statistics search for low-mass darkmat- ter in fixed-target electron-nucleus collisions. Ultimately, LDMX will explore thermal relic dark matter over most of the viable sub-GeV mass range to a decisive level of sensitivity. To achievethis 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 and energy in the detector. To identify these rare signal events, LDMX individually tags incoming beam- energy 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 calorime- ter 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 photonuclear reactions. This talk will summarize the small-scale detector concept for LDMX, ongoing performance studies, and near future prospects.
E-mail: [email protected]
Collaboration name: LDMX
HFCKM / PPHI / 318
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Diagnosing New Physics with Lepton Universality Violation and Lepton Flavor Violation
Author: Alakabha datta1
1 University of Mississippi
Corresponding Author: [email protected]
Recent measurements in B decays may indicate lepton universality violation. I will discuss how such lepton universality new physics might arise and how in many cases this new physics also leads to lepton flavor violation. I will consider some interesting processes where lepton universality and lepton flavor violations may be observed.
E-mail: [email protected]
Plenary 3 / 235
Lepton Universality Violation
Author: Gerco Onderwater1
1 University of Groningen
Corresponding Author: [email protected]
There is a wealth of experimental results questioning the deep-rooted assumption of lepton uni- versality in flavour-changing interactions. Recently, several anomalies were reported by the LHCb collaboration and there is the long standing discrepancy of the anomalous magnetic moment of the muon. At the same time the large LHC experiments do not see clear signals of New Physics, and there are ever-more impressive limits on charged lepton flavour violation. A comprehensive overview of the anomalous results will be presented and their implications will be highlighted.
E-mail: [email protected]
Collaboration name: LHCb
Plenary 3 / 77
Experimental Status of Vub/Vcb and the CKM Angle γ
Author: Abner Soffer1
1 Tel Aviv University
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Corresponding Author: [email protected]
Precision measurements of CKM parameters are important for defining the Standard Model and for searching for inconsistencies from new-physics contributions. I will review the status of current measurements and discuss the precision expected in future runs of LHCb and Belle II.
E-mail: [email protected]
Collaboration name: Belle II
Plenary 3 / 171
Measurement of the Weak Charge of the Proton by the Qweak Collaboration
Author: Kent Paschke1
1 University of Virginia
Corresponding Author: [email protected]
The measurement of the violation of parity symmetry in electron scattering is a powerful technique in the search for new fundamental forces. The Qweak collaboration has recently completed a highly precise measurement of parity violation in the elastic scattering of longitudinally polarized electrons from unpolarized protons. From this result, the weak charge of the proton is determined and com- pared to the Standard Model prediction, providing a constraint on the possible influence of new physics. The result will be presented, and the techniques and implications of this measurement will be discussed. Prospects for future improvements will also be briefly reviewed.
E-mail: [email protected]
Collaboration name: Qweak Collaboration
Plenary 4 / 90
Electromagnetic Properties of Antihydrogen and the Antiproton: Recent Results from ALPHA and BASE
Author: Daniel Maxwell1
1 Swansea University
Corresponding Author: [email protected]
The apparent dominance of matter over antimatter in the universe remains one of the greatest puzzles in science. The antiproton decelerator facility at CERN is home to several experiments dedicated to performing precise measurements of the properties of antimatter and hoping to provide insight
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into the matter-antimatter asymmetry problem. Recently the ALPHA and BASE experiments have reported measurements of the electromagnetic properties of the antihydrogen atom, and antiproton respectively, at unprecedented levels of precision. Following the observation of the first optical transition in antihydrogen atoms in 2016, ALPHA re- cently characterised one of the hyperfine components of the 1S-2S transition in antihydrogen. It was determined that the resonance frequency of this transition in antihydrogen matches that of hy- drogen, and is therefore consistent with CPT invariance, at a relative precision of 2 × 10−12. In 2017 the BASE collaboration reported a measurement of the magnetic moment of the antiproton to a relative precision of 1.5×10−9, an improvement on the precision of their previous measurement by a factor of 350. The result rivals the precision of the proton magnetic moment measurement and provides a stringent test of CPT invariance. In this talk I will review the recent measurement of the antiproton magnetic moment by the BASE collaboration, and spectroscopic measurements of the antihydrogen atom by the ALPHA collabora- tion.
E-mail: [email protected]
Collaboration name: ALPHA Collaboration
Plenary 4 / 95
Symmetries and Interactions from Lattice QCD
Author: Amy Nicholson1 Co-authors: Andre Walker-Loud ; Brian Tiburzi 2; Bálint Joó 3; Chia Chang ; Chris Bouchard 4; Chris Monahan 5; David Brantley 6; Enrico Rinaldi 7; Evan Berkowitz 8; Henry Monge-Camacho 6; Kostas Orginos 9; M.A. Clark 10; Nicolas Garron 11; Pavlos Vranas 12; Thorsten Kurth 13
1 UNC Chapel Hill 2 CCNY 3 JLab 4 University of Glasgow 5 Institute for Nuclear Theory 6 William & Mary, LBL 7 RIKEN-BNL 8 Forschungszentrum Jülich 9 William & Mary, JLab 10 NVIDIA 11 University of Liverpool 12 LLNL 13 NERSC
Corresponding Author: [email protected]
QCD has been long accepted as the underlying theory behind nuclear forces. However, calculations of nuclear properties directly from QCD have only very recently become mature. The theory’s non- perturbative nature at low energies requires the use of lattice regularization (lattice QCD) combined with numerical methods for its solution. With these tools in hand, we are now starting to be able to predict properties of nucleons and their interactions with fully controlled and quantifiable systemat- ics. In addition to giving us unique theoretical insight into the structure of nuclei, these techniques
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will allow us, for example, to inform the design and construction of experiments which utilize spe- cific nuclei for their symmetry properties, as well as pin down potential signs of new physics from experimental signals. In this talk I will present recent results from the CalLat collaboration relevant for nuclear physics, including a calculation of the nucleon axial charge to 1% precision, as well as quantities relevant for neutrinoless double beta decay searches.
E-mail: [email protected]
Plenary 4 / 73
NPDGamma: The Final Chapter
Author: Nadia Fomin1
1 University of Tennessee
Corresponding Author: [email protected]
Neutrons have been a useful probe in many fields of science as well as an important physical sys- tem for study in themselves. Modern neutron sources provide extraordinary opportunities to study a wide variety of physics topics. Among them is a detailed study of the weak interaction. These measurements, done in few-nucleon systems, are finally letting us gain knowledge of the hadronic weak interaction without the contributions from nuclear effects. The NPDGamma experiment aims to isolate the long-range component of the hadronic weak interaction by measuring the directional parity-violating asymmetry in polarized cold neutron capture on protons. The experiment and anal- ysis will be described and final results will be presented.
E-mail: [email protected]
Collaboration name: NPDGamma Collaboration
Plenary 4 / 81
Standard Model Tests in Neutron and Nuclear Beta Decay
Author: Martin Gonzalez-Alonso1
1 CERN
Corresponding Author: [email protected]
The status of tests of the Standard Model and of searches for new physics in nuclear andneutron beta decay will be reviewed. Using a model-independent description, I will discuss the interplay between the different experiments and which ones are the most sensitive and promising. FinallyI will analyse the synergy with searches at high-energy colliders, such as the LHC, and with other electroweak precision observables.
E-mail: [email protected]
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Funding source: CERN and European Commission’s Horizon 2020 Programme (contract no. 745954)
Precision Physics at High Intensities / 279
The Commissioning Run Update of the Muon g-2 Experiment at Fermilab
Author: Ran Hong1
1 Argonne National Laboratory
Corresponding Author: [email protected]
The Muon g-2 Experiment (E989) at Fermilab is measuring the anomalous magnetic moment ofthe muon aµ, aiming at improving the precision to 140 parts-per-billion (ppb) and resolving the standard deviation between the previous measurement of aµ and the Standard Model calculation of aµ. In E989, the muon beam is stored in a ring magnet. The spin precession frequency ωa is measured by counting the decay positrons in 24 calorimeters, and the magnetic field is measured by nuclear magnetic resonance (NMR) probes. Important improvements of this experiment and the progress of the commissioning run will be presented.
E-mail: [email protected]
Collaboration name: Muon g-2 Collaboration
DM / PHE / 38
Dark Matter Searches with the ATLAS Detector
Author: Young-Kee Kim1
1 Chicago University
Corresponding Author: [email protected]
Dark matter could be produced at the LHC if it interacts weakly with the Standard Model. Thesearch for dark matter can be performed directly, by looking for a signature of large missing transverse momentum coming from the dark matter candidates escaping the detector, measured against an accompanying visible object (jet, photon, boson). A broad and systematic search program covering these various possibilities with the ATLAS detector is in place: the talk will review the latest results of these searches.
E-mail: [email protected]
Collaboration name: ATLAS Collaboration
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Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity / 245
Inflation Ends, What is Next?
Author: Mustafa Amin1
1 Rice University
Corresponding Author: [email protected]
What happens in the aftermath of inflation? In this talk I will focus on the non-perturbative dy- namics of fields (such as soliton formation) after inflation ends and its observational consequences including: (1) a change in the expansion history after inflation; (2) generation of high frequency grav- itational waves; (3) possibility of primordial black-hole formation. Time permitting, I will also point out a novel connection between the fine-tuning of the Higgs potential and the generation of gravita- tional waves from the nonlinear dynamics of the Higgs+inflaton system during the post-inflationary epoch.
E-mail: [email protected]
Neutrino Masses and Neutrino Mixing / 249
Reactor Neutrino Oscillation at Daya Bay
Author: Matthew KramerNone
Corresponding Author: [email protected]
The Daya Bay reactor neutrino experiment continues to provide leading measurements ofthemix- ing angle θ13 as well as important constraints on the atmospheric mass splitting, reactor flux models, and light sterile neutrinos. This talk begins with a review of Daya Bay’s existing oscillation analysis based on 1,230 days of data. We then discuss the enhancements in our forthcoming result (to be an- nounced at Neutrino 2018), including increased statistics, improved reconstruction, a revised energy model, updated background estimates, and various reductions in other systematic uncertainties. We conclude with a preview of other upcoming publications from Daya Bay.
E-mail: [email protected]
Collaboration name: Daya Bay
Particle and Nuclear Astrophysics / 125
Stellar Explosions in the Lab: Measurements of Key Nuclear Re- actions Driving Nucleosynthesis
Author: Greg Christian1
1 Texas A&M University
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Corresponding Author: [email protected]
Stellar explosions such as novae, supernovae, X-ray bursts, and neutron star mergers are respon- sible for the synthesis of a large fraction of the terrestrial elements. Nucleosynthesis in explosive environments is driven by rapid successions of nuclear reactions and decays. In order to understand the dynamics and isotopic yields of stellar explosions, it is essential that the rates of the underlying nuclear reactions be well understood. Hence both direct and indirect laboratory measurements of key nuclear reactions involved in the nucleosynthesis processes are essential for a complete under- standing of explosive stellar nucleosynthesis. Many of these reactions proceed away from the valley of nuclear stability, leading to the requirement that radioactive beams be employed for measure- ments. In this talk, I will give an overview of recent state-of-the-art efforts to constrain explosive stellar nucleosynthesis through direct and indirect laboratory measurements. In particular, I will focus on measurements pertaining to radiative proton capture reactions that are important in classical no- vae. This will include a discussion of recent direct measurements using the DRAGON recoil mass separator and radioactive beams from the ISAC-I facility at TRIUMF. I will also discuss a new pro- gram under development at the Texas A&M University Cyclotron Institute, targeted at performing indirect measurements of radiative proton capture using re-accelerated radioactive beams.
E-mail: [email protected]
Heavy Flavors and the CKM Matrix / 350
Introduction to the CKM Matrix
Author: Wolfgang Altmannshofer1
1 University of Cincinnati
Corresponding Author: [email protected]
The Standard Model CKM matrix describes the observed flavor and CP violating phenomena inpar- ticle physics remarkably well. I will review the results of the global Unitarity Triangle fits performed by the UTfit and CKMfitter collaborations that use the latest inputs from experiments, latticeQCD, and phenomenological calculations. Furthermore, I will discuss how the Unitarity Triangle analysis can be extended in the presence of new physics and I will present bounds on the new physics scale that can be derived from meson oscillations.
E-mail: [email protected]
Precision Physics at High Intensities / 1
Hadronic Contributions to Muon g-2 and Spin Structure Func- tions
Author: Vladimir Pascalutsa1 Co-author: Franziska Hagelsteiin 2
1 University of Mainz
Page 44 CIPANP 2018 - Thirteenth Conference on the Intersections of Particle … / Book of Abstracts
2 University of Bern
Corresponding Author: [email protected]
I will discuss the relation, viz. Schwinger’s sum rule, between the g-2 and the spin structure functions. It allows one to assess the hadronic (as well as other) contributions to muon g-2 by measuring the structure function. The latter can be accessed experimentally in inelastic muon-electron scattering. I will outline the prospects of such measurements at the muon-beam facilities. This presentation is based on: F. Hagelstein and V. Pascalutsa, Phys.Rev.Lett. 120 (2018) no.7, 072002 [DOI: 10.1103/PhysRevLett.120.072002]
E-mail: [email protected]
Particle and Nuclear Astrophysics / 28
Nuclear Astrophysics Underground: Status & Future
Author: Frank Strieder1
1 South Dakota School of Mines & Technology
Corresponding Author: [email protected]
Even 60 years after the groundbreaking publication by Burbidge, Burbidge, Fowler, and Hoyle, Nu- clear Astrophysics is still a thriving research field at the interface of nuclear physics, astrophysics, and particle physics. An important topic is associated with the evolution of stars and its impact on the production of heavy elements. The study of the key reactions has been a major goal bythe community, in Europe, the US and also in China. However, the cosmic ray induced background has been prohibitive for advancing these measurements into the stellar energy range and reaction rates rely on theoretical extrapolations. Accelerator laboratories, located deep underground offer unique conditions for measuring these re- actions at low energies as demonstrated by the success of the LUNA facility at Gran Sasso, Italy. Over the past years the CASPAR laboratory has been commissioned at the Sanford Underground Research Facility (Lead, South Dakota) to address the further need for such facilities. CASPAR op- erates a 1MV, fully refurbished Van de Graaff accelerator that can provide beam intensities of more than 100 micro-Ampere. Furthermore, the LUNA-MV facility as well as the JUNA project in China’s Jinping Underground Laboratory will be operational in the near future. Successful implementation of a science program at these facilities result in significant progress in the field. The current status of the underground accelerator facilities for Nuclear Astrophysics will be reviewed.
E-mail: [email protected]
Collaboration name: CASPAR
Funding source: NSF
Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity / 154
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Using Microhalos to Probe the Universe’s First Second
Author: Adrienne Erickcek1
1 University of North Carolina at Chapel Hill
Corresponding Author: [email protected]
As remnants of the earliest stages of structure formation, the smallest dark matter halos provide a unique probe of the primordial density fluctuations generated during inflation and the evolution of the early Universe. Any enhancement to the small-scale matter power spectrum will trigger the formation of dark matter halos far earlier than otherwise expected. Consequently, observational limits on the abundance of early-forming ultra-compact minihalos (UCMHs) place a powerful upper bound on the amplitude of the small-scale power spectrum, which in turn constrains inflationary models. Numerical simulations of UCMH formation reveal that these constraints need to be revised: UCMHs do not have the steep power-law density profiles predicted by spherical collapse. The abun- dance of microhalos also encodes information about the evolution of the Universe prior to Big Bang nucleosynthesis because deviations from radiation domination accelerate the growth of small-scale density perturbations. The resulting population of microhalos significantly boosts the dark matter annihilation rate, making it possible to use gamma-ray observations to learn about the evolution of the Universe during its first second.
E-mail: [email protected]
Funding source: National Science Foundation PHY-1417446
DM / PHE / 353
Mono-X Searches for Dark Matter with the CMS Detector
Author: Siddharth Narayanan1
1 MIT
Corresponding Author: [email protected]
Searches using large missing momentum are a powerful tool for probing dark matter hypotheses using the Compact Muon Solenoid at the LHC. Collectively, they are dubbed “mono-X” searches, where X refers to one of many Standard Model signatures. In this talk, I will give an overview of the broad range of CMS mono-X analyses, describe new techniques developed during Run 2, and showcase the latest constraints on DM models.
E-mail: [email protected]
Collaboration name: Compact Muon Solenoid
Funding source: Department of Energy
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Neutrino Masses and Neutrino Mixing / 285
Latest Results of the Double Chooz Experiment
Author: Philipp Soldin1
1 RWTH Aachen University Germany
Corresponding Author: [email protected]
Double Chooz is a reactor neutrino disappearance experiment with the purpose of a precise mea- surement of the neutrino mixing angle θ13. The experimental set-up consists of two identical liquid scintillator detectors, one at a longer baseline of about 1 km since 2011 and a closer one with a dis- tance of about 400 m since 2014. This double-detector set-up with an essential iso-flux configuration allows one to fit the far detector data to the near detector data without relying on the reactorneu- trino flux predictions, where systematic uncertainties are suppressed to per mill levels. Statistical uncertainties are reduced by adding the delayed signal of the Hydrogen neutron capture in addition to Gadolinium, which yields an increase of more than a factor two in statistics. By performing a global fit of the energy dependent neutrino rates and shapes in both detectors simultaneously, the neutrino mixing angle θ13 can be obtained. The latest results of the Double Chooz collaboration are presented in this talk.
E-mail: [email protected]
Collaboration name: Double Chooz Collaboration
Heavy Flavors and the CKM Matrix / 157
Combined Measurement of the CP Violating Angle β by the BaBar and Belle Experiments
Author: Tomonari Miyashita1
1 Caltech
Corresponding Author: [email protected]
We present a recent joint measurement of the CP violating angle β using 1.1 inverse attobarns of data collected by the BaBar and Belle experiments. This analysis is based on a time-dependent Dalitz → ⋆ 0 → 0 + − plot analysis of B D h with D KSπ π decays. These decays provide experimental access to cos(2β) as well as sin(2β), and can therefore resolve an ambiguity in the determination of the apex of the CKM Unitarity Triangle. As part of the analysis, a full Dalitz plot amplitude analysis → 0 + − of D KSπ π is performed on a high-statistics charm data set. We report the first evidence for cos(2β)>0, an observation of CP violation, and the exclusion of the second solution of the CKM Unitarity Triangle of β = 68.1 ± 0.7 degrees at a significance of 7.3 standard deviations.
E-mail: [email protected]
Collaboration name: BaBar and Belle
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Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity / 26
Cosmology with a Helical Flavor
Author: Mohamed Anber1
1 Lewis & Clark College
Corresponding Author: [email protected]
Whether the parity of the Universe is broken on the large scale is an ongoing question. If this is the case, then one may trace the origin of parity violation back to the inflationary era. In this talk, I will review a few mechanisms that lead to the generation of helical fields, a source of breaking the parity on the large scale. The presence of helical U(1) fields in the early Universe can explain thebaryon asymmetry of the Universe. In fact, there is a connection between the baryon number and topology of the relic magnetic part of the U(1) field. Both the magnitude and sign of magnetic helicity canbe detected in future diffuse gamma ray data. This will be a smoking gun for a link between inflation, parity violating fields, and the baryon asymmetry of the Universe.
E-mail: [email protected]
Precision Physics at High Intensities / 7
Dispersive Analysis of Hadronic Light-by-Light Scattering and the Muon’s (g-2)
Author: Igor Danilkin1
Co-author: Marc Vanderhaeghen 1
1 Johannes Gutenberg-Universität Mainz
Corresponding Authors: [email protected], [email protected]
In my talk, I will present our recent dispersive analysis of the γγ⋆ → ππ, πη processes from the threshold up to 1.4 GeV in the two photon invariant mass. These amplitudes serve as important input to constrain the hadronic piece of light-by-light scattering contribution to (g-2) and support the current experimental program at BESIII. As well, I will present an application of the light-by- light scattering sum rules to the γγ⋆-production of mesons in light of the new data by the Belle Collaboration on the transition form factors.
E-mail: [email protected]
Particle and Nuclear Astrophysics / 153
Improving Astrophysical Nuclear Rates with New Many-Body and Fewer-Body Reaction Models
Author: Kenneth Nollett1
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1 San Diego State University
Corresponding Author: [email protected]
Nuclear and particle astrophysics has long relied on relatively crude models of nuclear reaction rates, because computational methods are lacking for systems of more than two particles and be- cause empirical constraints on simplified models are scarce. Ab initio methods, which model nuclei using a quantitatively accurate nucleon-nucleon interaction and reasonably complete model spaces, now offer alternatives to the traditional reaction-by-reaction or systematics-based phenomenology. Particularly at A < 12, there are now theoretical cross sections grounded directly in nucleon-level physics. I will give a quick overview of this work to date, emphasizing the significant further invest- ments in each ab initio approach that are needed to produce accurate results with quantified errors. I will then argue that in the long run, these methods are unlikely to deliver astrophysical rates of the desired precision without inputs beyond the nucleon-nucleon interaction: rates are too sensitive to “finely tuned” numbers like threshold and resonance energies. It is therefore urgent todevelop methods that can consistently incorporate complementary information from both ab initio and em- pirical data into “fewer-body” models like the empirical R-matrix or halo effective field theory (EFT), particularly in combination with Bayesian methods to provide quantified errors. I will illustrate this point with applications of halo EFT to rates in the solar pp-chain.
E-mail: [email protected]
Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity / 344
Cosmological Probes of Dark Matter Interactions
Author: Vera Gluscevic1
1 Institute for Advanced Study
Corresponding Author: [email protected]
Abundance of cosmological data will enable sensitive probes of dark matter physics in the coming decade. I will focus on scattering of sub-GeV dark matter with baryons in the pre-recombination Universe, summarize the status of cosmological searches, present forecasts for the next-stage CMB experiments, and discuss distinguishability of various signatures of new physics sought by CMB surveys.
E-mail: [email protected]
DM / PHE / 39
Searches for Dark Matter Mediators with the ATLAS Detector
Author: Peter McNamara1
1 The University of Melbourne
Corresponding Author: [email protected]
The search for dark matter can be performed indirectly at the LHC by looking for the intermediate mediators which would couple the dark matter particles to the Standard Model. The mediator could
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indeed decay to jets or leptons, leading to a resonant signature which can be probed. The talk will present the results of these searches with the ATLAS detector and show their complementarity with the other ATLAS searches looking directly for Dark Matter.
E-mail: [email protected]
Collaboration name: ATLAS Collaboration
Neutrino Masses and Neutrino Mixing / 145
PROSPECT: a Precision Reactor Oscillation and SPECTrum Short- Baseline Antineutrino Experiment
Author: Bryce Littlejohn1
1 IIT
Corresponding Author: [email protected]
PROSPECT (Precision Reactor Oscillation and SPECTrum) is a short-baseline reactor antineutrino ex- periment. PROSPECT consists of a segmented 4-ton 6Li liquid scintillator antineutrino detector that will precisely measure the 235U fission antineutrino spectrum from the High-Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory (ORNL). PROSPECT’s high statistics and high resolution measurements of the antineutrino energy spectrum and flux from HFIR’s 235U core will be vital to understanding the discrepancies between predicted and measured antineutrino spectra and fluxes observed in previous commercial power reactor neutrino experiments; in addition, PROSPECT will search for the existence of sterile neutrino oscillations at the eV-scale. PROSPECT’s assembly was completed in late 2017 and data taking at HFIR began in 2018. This talk will explain PROSPECT’s physics objectives, describe its experimental design, and cover its installation and initial data-taking at ORNL.
E-mail: [email protected]
Collaboration name: PROSPECT
Particle and Nuclear Astrophysics / 86
Probing Explosive Nucleosynthesis with TwinSol Measurements
Author: Dan Bardayan1
1 University of Notre Dame
Corresponding Author: [email protected]
The nucleosynthesis occurring in astrophysical explosions can be very different than that whichoc- curs in main sequence stars such as our sun. In fact, many of the properties of explosive astrophysical
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events are determined by the nuclear physics of the radioactive nuclei that power the explosion. At the University of Notre Dame TwinSol radioactive beam separator, exotic nuclei of astrophysical interest are being produced and studied in order to further our understanding of astrophysical ex- plosions. In fact, TwinSol was one of the first such devices in the United States dedicated to radioac- tive beam production. Recent studies include the first neutron angular distribution measurement from a (d,n) reaction on an exotic beam and some of the most precise half-life measurements to constrain elements in the CKM matrix. These studies along with future plans and upgrades willbe presented.
E-mail: [email protected]
Collaboration name: TwinSol Collaboration
Funding source: National Science Foundation
Precision Physics at High Intensities / 256
Hadronic Matrix Elements for Muon g–2 in Lattice QCD
Author: Aaron Meyer1 Co-authors: Christoph Lehner 1; Mattia Bruno 1; Taku Izubuchi 1
1 Brookhaven National Laboratory
Corresponding Author: [email protected]
The muon anomalous magnetic moment is a subject of intense focus for theoretical and experimen- tal particle physics at this time. This quantity is especially sensitive to new physics, so the current tension with Standard Model predictions makes the anomalous magnetic moment especially excit- ing. The muon g − 2 can be measured with high precision, and predictions from theory must be similarly precise to be informative. However, some pieces of the theory prediction that include hadronic matrix elements are difficult or impractical to determine experimentally, and predictions from models lack robustly quantitative statements about the uncertainty. To circumvent this issue, these hadronic matrix elements may be determined precisely with lattice QCD. In this talk, I will give an overview of recent developments in lattice QCD to address the hadronic matrix elements, in- cluding the hadronic light-by-light (HLbL) and hadronic vacuum polarization (HVP) diagrams. With these improvements to the theory, it will be possible to match the expected experimental precision in time for the completion of the Fermilab g − 2 experiment.
E-mail: [email protected]
Heavy Flavors and the CKM Matrix / 216
Determination of Vub and Vcb
Author: Matic Lubej1
1 Jozef Stefan Institute
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Corresponding Author: [email protected]
Semileptonic decays of B mesons involving low-mass charged leptons e or µ are expected to be free of non-Standard Model contributions and therefore play a critical role in determinations of |Vcb| and |Vub| (|Vqb|). Decays of the form b → cℓν¯ℓ and b → uℓν¯ℓ allow us to determine these matrix elements and test the CKM sector of the Standard Model. The theory underlying the determination of |Vqb| is mature and experimental measurements are precise. However, the difference between exclusive and inclusive determinations persist even as the theoretical and experimental errors get smaller with more statistics, better theoretical calculations, and more precise measurements. Of all the CKM matrix parameters, |Vub| is the least precise and in most need of additional studies in order to constrain the apex of the unitarity triangle even further. We present the procedures and latest results for exclusive and inclusive determinations of |Vqb|.
E-mail: [email protected]
Collaboration name: Belle II Collaboration
Particle and Nuclear Astrophysics / 94
Sensitivity Study for the 12C(α, γ)16O Astrophysical Reaction Rate
Author: Roy Holt1
Co-authors: Brad Filippone 2; Steven Pieper 3
1 California Institute of Technology and Argonne National Laboratory 2 California Institute of Technology 3 Argonne National Laboratory
Corresponding Author: [email protected]
The 12C(α, γ)16O reaction has a key role in nuclear astrophysics. A multilevel R-matrix analysis was used to make extrapolations of the astrophysical S factor for this reaction to the stellar energy of 300 keV. The statistical precision of the S-factor extrapolation was determined by performing multiple fits to randomized (according to the experimental errors) existing E1 and E2 ground state data.The impact of a future proposed experiment at Jefferson Laboratory (JLab) was assessed within this frame- work. The proposed JLab experiment will make use of a high-intensity low-energy bremsstrahlung beam that impinges on an oxygen-rich single-fluid bubble chamber in order to measure the total cross section for the 16O(γ, α)12C reaction. The importance of low energy data as well as high pre- cision data was investigated. The results of this study will be presented.
E-mail: [email protected]
Funding source: U.S. National Science Foundation, grant 1506459 and U.S. Department of Energy, Office of Nuclear Physics, contract No. DE-AC02-06CH11357.
Neutrino Masses and Neutrino Mixing / 22
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Accelerator and Reactor Complementarity in Coherent Neutrino- Nucleus Scattering
Author: Jayden Newstead1
1 Arizona State University
Corresponding Author: [email protected]
Coherent elastic neutrino-nucleus elastic scattering (CEνNS) experiments can be used to constrain new physics in the form of non-standard neutrino interactions (NSI). First, we consider the current data from the recent observation by the Coherent experiment within a Bayesian framework. Second, we demonstrate the complementarity of future reactor and accelerator experiments, by employing at least two distinct target materials at each source. This enables a degeneracy between up and down flavor-diagonal NSI terms to be broken. Considering four flavor-diagonal (ee/µµ) up- and down- type NSI parameters, we find that all terms can be measured with high local precision (to awidthas small as ∼5% in Fermi units) by next-generation experiments.
E-mail: [email protected]
Heavy Flavors and the CKM Matrix / 189
First Collisions at Belle II
Author: Anselm Vossen1
1 Duke University/JLab
Corresponding Author: [email protected]
The Belle II experiment at the asymmetric energy e+e− collider SuperKEKB is a next generation B-factory, taking advantage of an upgrade of the collider complex to deliver about 40× the lumi- nosity that was available to Belle. Together with a state-of-the-art detector upgrade, a rich physics program will be accessible by Belle II. Highlights are beyond-the-standard-model physics searches in precision measurements of the flavor sector and a rich spectroscopy program. Belle II is set tosee first collisions at the end of April of this year, and by the time of this presentation, thesecondcom- missioning phase with beam and the full detector, except the vertex detector, will be in full swing. This talk will give the status of the commissioning as well as an outlook of the physics programwith a focus on measurements possible with data from phase II.
E-mail: [email protected]
Collaboration name: Belle II
DM / PHE / 354
Searches for Dark Matter Mediators with the CMS Detector
Author: Javier Duarte1
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1 Fermilab
Corresponding Author: [email protected]
We present several complementary searches for dark matter mediators using a 35.9 inverse femto- barn data set of proton-proton collisions at 13 TeV collected with the CMS experiment at the LHC in 2016. One technique uses the CMS scouting data stream concept to record larger data rates than oth- erwise possible. Other searches use initial state radiation to overcome trigger thresholds and study boosted dijet resonances, whose decay products are merged into a single jet. Novel jet substructure techniques are used to avoid sculpting the distribution of the jet mass distribution and the dominant background is estimated from data. The searches are interpreted in the context of simplified models of dark matter with a leptophobic mediator. This approach has also been extended to the searchfor boosted Higgs bosons decaying to bottom quark-antiquark pairs.
E-mail: [email protected]
Collaboration name: CMS
Precision Physics at High Intensities / 287
Measurement of Hadronic Cross Sections at BESIII
Author: Christoph Florian Redmer1
1 Institute for Nuclear Physics, Johannes Gutenberg-University Mainz
Corresponding Author: [email protected]
The uncertainties of the Standard Model prediction of the anomalous magnetic moment ofthemuon are currently completely dominated by hadronic contributions. The largest contribution is due tothe hadronic vacuum polarization. Hadronic cross sections measured at e+e− colliders can be exploited as experimental input to improve the calculations, making use of the optical theorem. At the BESIII experiment in Beijing these cross sections are determined using different methods. At center-of- mass energies above 2 GeV, exclusive and inclusive cross sections can be measured in an energy scan. Additionally, cross sections can be determined starting from the π+π− mass threshold using the method of Initial State Radiation. This presentation will give an overview of the recent results and the current status of the analyses.
E-mail: [email protected]
Collaboration name: BESIII
Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity / 306
Self-Interacting Dark Matter and Diverse Galactic Rotation Curves
Author: Hai-Bo Yu1
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1 University of California, Riverside
Corresponding Author: [email protected]
Astrophysical observations, spanning dwarf galaxies to galaxy clusters, indicate that the dark mat- ter halo properties are much more diverse than predicted in the prevailing cold dark matter theory. In this talk, I will show that self-interacting dark matter can provide a unified solution to anum- ber of observed puzzles on galactic scales, including the diverse galactic rotation curves, the radial acceleration relation, and the density cores in galaxy clusters.
E-mail: [email protected]
DM / PPHI / 297
Hidden Sectors and Dark Photons
Author: Stefania Gori1
1 University of Cincinnati
Corresponding Author: [email protected]
Dark Matter (DM) provides strong evidence for physics beyond the Standard Model (SM). Arguably, rather than suggesting a specific mass scale for New Physics, it may point to a dark sector, weakly- coupled to the SM, as hinted at by the comparable abundances of dark matter and visible baryons. In the past few years, a program of new experiments has expanded DM searches far beyond the WIMP paradigm to include new hidden forces and matter. In this talk, I will give an overview of dark photon models and of the present and future experimental effort in testing these models at high intensity facilities.
E-mail: [email protected]
Tests of Symmetries and the Electroweak Interaction / 147
Measurement of the Neutron Lifetime Using a Magneto-Gravitational Trap
Author: Nathan Callahan1
1 Indiana Univeristy
Corresponding Author: [email protected]
Precision measurements of the free neutron lifetime τn, when combined with measurements of the axial vector coupling, can be used to test unitarity of the CKM matrix. Nonunitarity is a signal for physics Beyond the Standard Model (BSM). Sensitivity to BSM physics requires measurements of τn to a precision of 0.1 s. However, the two dominant techniques to measure τn (colloquially beam and bottle measurements) disagree by nearly 10 s.UCNτ is a neutron lifetime experiment using a magneto-gravitational trap and an in-situ neutron detector. Neutrons in this trap are not susceptible to loss on material walls as in previous bottle measurements. Additionally, the in-situ detector allows spectral monitoring of the trapped Ultracold Neutrons. In this talk, I will present our most recent
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result τn = 877.7 ± 0.7(stat.) + 0.4/ − 0.2(sys.). I will also present Monte Carlo simulations of systematic effects in the experiment.
E-mail: [email protected]
Collaboration name: UCNtau
PGDNN / QMHI / 144
Recent Progress in Nuclear Parton Distributions
Author: Maria Zurita1
1 Brookhaven National Laboratory
Corresponding Author: [email protected]
Nuclear Parton Distribution Functions (nPDFs) are the non-perturbative objects that describe the behavior of partons in a nuclear medium, a natural extension of the free proton PDFs. Despite more than three decades of thorough study, the picture of nPDFs is far from being complete. In this talk I will present the current status of our knowledge and briefly discuss how current and future experiments can help broaden our understanding of matter.
E-mail: [email protected]
Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity / 29
Searching for Dark Matter at the Cosmic Dawn
Author: Julian Munoz1
Co-authors: Abraham Loeb 2; Cora Dvorkin 2
1 Harvard University 2 Harvard
Corresponding Author: [email protected]
The nature of the dark matter is still a mystery, although current and upcoming 21-cm measurements during the cosmic dawn can provide anew arena on the search for the cosmological dark matter. This era saw the formation of the first stars, which coupled the spin temperature ofhydrogento its kinetic temperature— producing 21-cm absorption in the CMB. The strength of this absorption acts as a thermostat, showing us if the baryons have been cooled down or heated up by different processes. In particular, during the cosmic dawn, the baryon-dark matter fluid is the slowest it will ever be , making it ideal to search for dark matter elastically scattering with baryons through massless mediators, such as the photon. Iwill describe how dark-matter particles with an electric “minicharge” can significantly alter the baryonic temperature, and thus explain the anomalous 21-cm depth observed by the EDGES collaboration.
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E-mail: [email protected]
Neutrino Masses and Neutrino Mixing / 200
Recent Long-Baseline Neutrino Mixing Results from NOvA
Author: Kirk Bays1
1 California Institute of Technology
Corresponding Author: [email protected]
Neutrinos are elusive fundamental particles only directly detectable through weak interactions, and they may be the key to understanding supernovae, the matter-antimatter asymmetry in the uni- verse, and more. Neutrinos oscillate, where they change flavor as they travel due to being ina quantum superposition of states with different masses, which has already forced us to amend the Standard Model. The details of neutrino oscillations are still being unraveled, and the US program of long-baseline neutrino oscillation experiments centered around the Fermi National Accelerator Laboratory is at the forefront of measuring such fundamental neutrino properties. In this talk I’ll focus on the latest results from the NOvA experiment, where muon neutrinos are shot 810 km to a 14 kton liquid scintillator detector deep in the Minnesota forest.
E-mail: [email protected]
Collaboration name: NOvA Collaboration
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 215
Understanding the EMC Effect Through Tagged Processes with ALERT
Author: Whitney Armstrong1
1 Argonne National Lab
Corresponding Author: [email protected]
Spectator tagged hard processes can provide insight into the origins of the EMC Effect by identify- ing the struck nucleon. A comprehensive program of experiments on light nuclei (deuterium and 4He) at JLab using the CLAS12 spectrometer and a Low Energy Recoil Tracker (ALERT) will detect the low energy nuclear spectator system (p, 3H and 3He) in a variety of hard scattering processes. Tagged deep inelastic scattering will provide stringent tests leading to clear differentiation between the many models describing the EMC Effect by accessing the bound nucleon virtuality through its initial momentum at the point of interaction. Furthermore, spectator-tagged deeply virtual Comp- ton scattering will provide a measurement of off-forward EMC Effect as a new indicator ofpotential nuclear modifications of a bound nucleon. We will discuss details of the ALERT detector andmea- surements that will help understand the origin of the EMC Effect.
E-mail:
Page 57 CIPANP 2018 - Thirteenth Conference on the Intersections of Particle … / Book of Abstracts [email protected]
Collaboration name: ALERT
Physics at High Energies / 49
Search for Di-Higgs Production
Author: Arnaud Ferrari1
1 Uppsala University
Corresponding Author: [email protected]
Di-Higgs final states can arise through non-resonant production of two Higgs bosons and through potential heavy states decaying to two Higgs bosons. This talk presents searches in several Higgs boson decay channels using 36 fb−1 of pp collision data recorded at 13 TeV.
E-mail: [email protected]
Collaboration name: ATLAS Collaboration
Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity / 246
A Particle Physicist’s Perspective on the EDGES Anomaly
Author: Samuel McDermott1
1 FNAL
Corresponding Author: [email protected]
In a recent pair of Nature papers, Bowman et al. claimed a detection of an anomalously low 21 cm brightness temperature at a redshift of 17, and Barkana interpreted this as evidence of cold darkmat- ter that was scattering with baryons at that cosmic epoch. In this talk, I will discuss constraints avail- able in the particle physics literature, and future directions for particle, astro, and nuclear physics in the wake of the EDGES observation. A number of independent groups have found that cosmological constraints limit only a subdominant fraction of the dark matter particles to be able to participate in this scattering, and that even this limited scenario is strongly bounded by complementary terres- trial considerations. The prospects for investigating this small remaining region of viable parameter space are discussed in both terrestrial and astrophysical contexts.
E-mail: [email protected]
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Tests of Symmetries and the Electroweak Interaction / 123
Measurement of the Electron-Antineutrino Correlation in Neu- tron Beta Decay: aCORN Experiment
Author: Fred Wietfeldt1
1 Tulane University
Corresponding Author: [email protected]
The aCORN experiment uses a novel “wishbone asymmetry” method to measure the electron-antineutrino correlation (a-coefficient) in free neutron decay that does not require precision proton spectroscopy. aCORN completed two physics runs at the NIST Center for Neutron Research. The first run on the NG-6 beam line in 2013–2014 obtained the result a = 0.1090 ± 0.0030(stat) ± 0.0028(sys), a net uncertainty of 3.8%. The second run on the new NG-C high flux beam line promises an improvement in precision to <2%. Details of the experiment and data analysis will be presented.
E-mail: [email protected]
Collaboration name: aCORN
Funding source: NSF, DOE, NIST
DM / PPHI / 60
Searches for Hidden Sectors with BABAR
Author: Brian Shuve1
1 Harvey Mudd College
Corresponding Author: [email protected]
Many models of physics beyond the Standard Model (SM) predict new, hidden-sector particles with masses below the electroweak scale. These models are motivated by solutions to the dark matter problem, the hierarchy problem, neutrino masses, and other physics that is not accounted for in the SM. Low-energy electron-positron colliders such as BABAR are ideally suited to discover these hidden-sector particles. We present several BABAR searches for low-mass hidden-sector particles, including visibly and invisibly decaying dark photons, and a dark muonic force. These examples show the importance of B-factories in discovering and constraining new hidden-sector physics be- yond the SM.
E-mail: [email protected]
Collaboration name: BABAR
Funding source: self-funded but need registration fee waiver
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Physics at High Energies / 48
Searches for Non-Standard Model Higgs Bosons
Author: Ana Elena Dumitriu1
1 IFIN,CPPM
Corresponding Author: [email protected]
Several theories beyond the Standard Model predict the existence of high mass neutral or charged Higgs particles. In this presentation the latest ATLAS results on searches for these particles based on 36 fb−1 of pp collision data collected at 13 TeV will be discussed.
E-mail: [email protected]
Collaboration name: ATLAS Collaboration
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 323
Update on the Jefferson Lab Hall A Tritium Experiments
Author: Axel Schmidt1
1 MIT
Corresponding Author: [email protected]
A large body of evidence suggests isospin symmetry plays a key role in the EMC effect, the mod- ification of quark distribution functions in the nuclear medium, as well as short-range correlated pairing between nucleons. Electron scattering experiments that probe the momentum distributions of quarks or of nucleons are limited to nuclei near the valley of stability, in a narrow band of proton- neutron asymmetry, making it difficult to learn about how this asymmetry affects the nuclearen- vironment. Tritium and helium-3, being highly asymmetric isospin-mirror nuclei, present a special opportunity; by comparing electron scattering from tritium and helium-3, as well as from deuterium, isospin symmetry can be exploited to disentangle the u- and d-quark EMC effects and the isospin de- pendence of short-range correlations. This past spring, a first round of experiments were completed at Jefferson Lab’s Hall A using sealed-cell tritium and helium-3 targets, in order to look atelectron scattering in deep-inelastic and quasi-elastic kinematics. These experiments will offer aone-of-a- kind look at the isospin dependence of the nuclear medium. In this talk, an overview of the three recent Hall A experiments and their physics goals will be presented.
E-mail: [email protected]
Neutrino Masses and Neutrino Mixing / 310
Neutrino Oscillation Results from the T2K Experiment
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Author: Cristovao Vilela1
1 Stony Brook University
Corresponding Author: [email protected]
T2K is a long baseline neutrino oscillation experiment making use of Super-Kamiokande as its off- axis far detector that has been taking data since 2010. The results of the oscillation analysis with five far detector samples, including data taken up to May 2017 with a total of 14.7 × 1020 POT accumu- lated in neutrino-mode and 7.6 × 1020 POT in anti-neutrino mode, will be presented. In particular, these results have been produced with a new reconstruction algorithm for Super-Kamiokande, in- cluding re-optimized far detector event selections and expanded fiducial volume, with an effective statistical improvement of 30% compared to previous analyses.
E-mail: [email protected]
Collaboration name: T2K Collaboration
PGDNN / QMHI / 111
Nuclear PDF, Small x Physics Results at RHIC
Author: Xuan Li1
1 Los Alamos National Lab
Corresponding Author: [email protected]
The proton gluon distribution function increases rapidly with decreasing momentum fraction x at fixed Q2, but cannot increase indefinitely as x decreases. Gluon saturation is expected at a low x value when gluon recombination balances gluon splitting. The nuclear (with atomic mass number A) gluon distribution is approximately A1/3 larger than the nucleon gluon distribution function at the same x. Understanding the kinematics of gluons in the low x region will provide insights into the nuclear matter origin and improves the knowledge of Quantum Chromodyanmics (QCD) in the non-perturbative region. The Relativistic Heavy Ion Collider (RHIC) can probe gluons with x between 0.001 and 0.02 inside the gold nuclei via forward di-jet or di-hadron measurements. Both STAR and PHENIX experiments have carried out a series of measurements to study the nuclear gluon distribution functions (nPDFs) and observed clear nuclear modification of the gluon PDF in the low x region. Recent studies of forward inclusive hadron, di-hadron, di-jet and heavy flavor measurements in 200 GeV d+Au, p+Au, p+Al and 3He+Au collisions and 500/510 GeV p+p collisions have extended the kinematic region of the probed proton/nuclear gluon distribution function. We will present selected results from RHIC in this talk. Prospects of future measurements from detector upgrades at PHENIX, sPHENIX and Electron Ion Collider (EIC) will be presented as well.
E-mail: [email protected]
Collaboration name: PHENIX
Funding source: DOE Office of Science
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Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity / 188
Realizing the Promise of 21 cm Cosmology with HERA
Author: Josh Dillon1
1 UC Berkeley
Corresponding Author: [email protected]
21 cm cosmology promises to provide an exquisite and perhaps revolutionary new 3D probe of our early universe. With it, we can uncover the astrophysics of the first luminous objects in the universe, improve CMB constraints on cosmological parameters, and cross-check the recent EDGES detection of an anomalously large absorption feature that points tantalizingly at new physics. However, realiz- ing that promised probe of the astrophysics and cosmology of the the “Cosmic Dawn” and the epoch of reionization (EoR) has proven extremely challenging. We’re looking for a small signal buried un- der foregrounds orders of magnitude brighter. We need large interferometers, precisely calibrated, producing mountains of data to have any shot of seeing the signal. In this talk, I will present the Hydrogen Epoch of Reionization Array, a purpose-built interferometer currently under construction in South Africa that is designed not just to detect the EoR but to characterize its evolution and to push deeper into the Cosmic Dawn. I will discuss the analysis techniques we’ve developed and the progress we’ve made separating the 21 cm from astrophysical foregrounds.
E-mail: [email protected]
Collaboration name: Hydrogen Epoch of Reionization Array (HERA)
Funding source: National Science Foundation, Gordon and Betty Moore Foundation
Physics at High Energies / 328
Highlights from SUSY Searches with the CMS Detector
Author: James Hirschauer1
1 FNAL
Corresponding Author: [email protected]
With the collection of approximately 90 fb−1 of proton-proton collision data at center-of-mass col- lision energy of 13 TeV since 2015, CMS is probing high mass supersymmetry (SUSY) parameter space with large datasets for the first time. The talk will first review results of the standard searches for strongly produced natural SUSY, and highlight corners of phase space where SUSY could still be hiding. Searches for lower cross section electroweak SUSY production will also be presented. The talk will conclude with a discussion of non-traditional SUSY searches including those in final states with long-lived particles and low missing transverse energy from R-parity violation.
E-mail: [email protected]
Collaboration name: CMS Collaboration
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Tests of Symmetries and the Electroweak Interaction / 208
New Results from the UCNA Experiment
Authors: Eric Dees1; Michael Brown2
1 NCSU 2 UKY
Corresponding Author: [email protected]
The primary goal of the UCNA experiment is to provide, using polarized ultracold neutrons (orUCN), a high precision measurement of the axial coupling constant in neutron decay, gA. High precision predictions for neutron decay in the Standard Model can be achieved with just two measurements: one to fix the absolute vector coupling strength, and one to determine gA. These parameters play a critical role in a variety of physics scenarios, such as big bang nucleosynthesis, high precision models of the solar fusion rate, and high precision modeling of reactor neutrino fluxes. Neutron measurements also provide input for constraints on a variety of extensions to the Standard Model, in many cases at, or beyond, the sensitivity ultimately expected from the Large Hadron Collider. Although the vector coupling strength can be obtained from super-allowed nuclear decays, neutron decay is the definitive source for high precision values of gA. UCNA is designed to determine gA through a measurement of the angular correlation between the neutron spin and the momentum of the emitted beta particle, known as the beta asymmetry. UCNA is also the first angular correlation measurement to utilize UCN to control key sources of systematic error: the neutron polarization and neutron-generated backgrounds. We present here the results of 2011–2013 running at the Los Alamos Neutron Science Center and place our results in the context of the world data set.
E-mail: [email protected]
Collaboration name: UCNA
DM / PPHI / 8
Direct Search for Dark Photons and Dark Higgs with the SeaQuest Spectrometer at Fermilab
Author: Ming Liu1 Co-authors: Kun Liu 2; Sho Uemura 2
1 Los Alamos National Laboratory 2 LANL
Corresponding Authors: [email protected], [email protected]
The SeaQuest experiment has been in operation since 2011 and is designed to study nuclear depen- dent Drell-Yan productions in the dimuon channel using the high intensity 120 GeV proton beam from the Main Injector on various thin nuclear targets (about ∼ 0.1 nuclear interaction lengths each). It provides an ideal setting for dark photon and dark Higgs search in a parameter spaceof great interest. In this energy, through kinetic mixing, the postulated low-mass (∼< 10 GeV) dark photon (and/or dark Higgs) particles could be produced in the Drell-Yan like q +q ¯ (or g + g) fusion
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processes in high energy proton + nucleus collisions, mostly in the beam dump (p + F e) and decay into dimuons (or di-electrons). For this search, a dedicated displaced-vertex trigger detector was built, installed and commissioned with upgraded DAQ in 2017. This trigger uses two planes of ex- truded scintillators to identify dimuons originating far downstream of the target, and is sensitive to dark photons (dark Higgs) that travel deep inside the beam dump before decaying to dimuons. We successfully took one week worth of production data parasitically with the E906 experiment in 2017. We will continue taking additional data parasitically alongside the upcoming SeaQuest polarized proton target physics program (E1039) for several years. In this talk we will present the latest status of the preliminary dark photon search from 2017 data and also discuss future opportunity.
E-mail: [email protected]
Collaboration name: SeaQuest
PGDNN / QMHI / 293
Cold-QCD Physics of the STAR Forward Upgrade
Author: James Drachenberg1
1 Lamar University
Corresponding Author: [email protected]
For almost twenty years, the STAR experiment at RHIC has played a leading role in expanding the frontier of nucleus-nucleus collisions and the interaction of spin-polarized beams of protons. In com- ing years, the STAR forward upgrade will enable new insight into cold nuclear matter, probing this physics at high and low regions of x. The proposed detector upgrades consist of electromagnetic and hadronic calorimetry as well as a charged-particle tracking system, each spanning the pseudora- pidity range of 2.5 < η < 4.5. Building upon existing STAR measurements, the upgrade will enable improved and precision measurements of probes such as neutral pions, direct photons, and Drell- Yan. Simultaneously, the upgrade will unlock a suite of new observables, such as charged-particle tagged jets at forward pseudorapidity. These measurements will provide new insights into the mul- tidimensional imaging of quarks and gluons within the nucleon, nuclear parton distributions, and hadronization in a nuclear environment. As such, the STAR forward upgrade will provide informa- tion crucial to realizing the full potential of the approaching era of the electron-ion collider.
E-mail: [email protected]
Collaboration name: STAR Collaboration
Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity / 88
21 cm Dark Energy Cosmology with CHIME
Author: Laura Newburgh1
1 Yale University
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Corresponding Author: [email protected]
The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is a new radio transit interferom- eter now taking data at the Dominion Radio Astrophysical Observatory (DRAO) in Penticton, BC, Canada. We will use the 21 cm emission line of neutral hydrogen to map baryon acoustic oscillations between 400–800 MHz across 3/4 of the sky. These measurements will yield sensitive constraints on the dark energy equation of state between redshifts 0.8–2.5, a fascinating but poorly probed era corresponding to when dark energy began to impact the expansion history of the Universe. I will describe the CHIME instrument, the analysis challenges, the calibration requirements, and current status.
E-mail: [email protected]
Collaboration name: CHIME Collaboration
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 183
New Measurements of the EMC Effect in Hall-C at Jefferson Lab
Author: Eric Pooser1
1 Jefferson Lab
Corresponding Author: [email protected]
The x dependence of the EMC effect has been measured for a variety of nuclei in a multitude of experiments conducted over the past 35 years. Previous EMC ratio measurements for light nuclei (A ≤ 12) have shown a dependence on the local nuclear structure of nucleons and the associated modification to nuclear structure functions. The newly commissioned Super High Momentum Spec- trometer (SHMS) in Hall-C has been used to collect inclusive electron scattering measurements on various light nuclei utilizing the 12 GeV CEBAF facility at Jefferson Lab. These data obtained dur- ing a portion of E12-10-008 includes previously unmeasured nuclei, namely 10B and 11B, and will therefore provide a comparison of nuclei which differ by just one nucleon. This will facilitate the extraction of the nucleon structure function as modified by the nuclear medium. Status of the target- ratio analysis of recently acquired E12-10-008 data will be discussed.
E-mail: [email protected]
Collaboration name: Hall-C Commissioning Experiments Run Group
Funding source: DE-AC05-06OR23177
DM / PPHI / 16
The Beam Dump eXperiment
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Author: Mariangela Bondi’1
1 INFN - Sez. Catania
Corresponding Author: [email protected]
The Beam Dump eXperiment is an electron-beam thick-target experiment aimed to investigate the existence of Light Dark Matter particles in the MeV-GeV mass range. The experiment hasbeen conditionally approved and is expected to run in a dedicated underground facility located about 20 m downstream of the JLab-Hall A beam-dump. The detector consists of two main components: a CsI(Tl) electromagnetic calorimeter (ECal) and a veto system used to suppress the background. The expected signature of the DM interaction in the Ecal is a ∼ GeV electromagnetic shower paired with a null activity in the surrounding active veto counters. A complete small-scale prototype of the final detector has been constructed in order to validate the proposed technology and demonstrate the capability to reject the cosmogenic background. Beam-related background was estimated by means of Monte Carlo (MC) simulations. In order to benchmark our simulation tools with on site data, we recently measured, with JLab support, the muon background produced by the 10.6 GeV e-beam on the Hall-A dump at the location of the proposed BDX facility with present shielding configuration. A hodoscope made by a BDX ECal CsI(Tl) crystal sandwiched between a set of segmented plastic scintillators was used to measure the muon rate. This talk will present an overview of the BDX experiment with a particular focus on the results of the recent muon-flux measurements and the comparison with the corresponding simulations.
E-mail: [email protected]
Collaboration name: BDX Collaboration
Neutrino Masses and Neutrino Mixing / 321
The Short Baseline Neutrino Oscillation Program at Fermilab
Author: Jyoti Joshi1
1 Brookhaven National Laboratory
Corresponding Author: [email protected]
Neutrino Oscillation, i.e., discovery that neutrinos have mass, is perhaps the most striking recent experimental evidence of physics which found a crack in the Standard Model to give us a glimpse of the fundamental underlying theories. The Short-Baseline Neutrino (SBN) program makes useof a trio of LArTPC (Liquid Argon Time Projection Chamber) detectors — named the Short-Baseline Near Detector or SBND, MicroBooNE and ICARUS — positioned along Fermilab’s Booster Neutrino Beam (BNB), to address the previously observed short-baseline neutrino anomalies. LArTPC is a state-of-the-art technology for studying these mysterious particles and building mas- sive neutrino detectors. LArTPCs provide 3D imaging of interaction events with excellent spatial resolution. This scaleable detector technology allows us to make precision measurements ofneu- trino interactions. This talk will give an overview of the current and future short-baseline neutrino oscillation experiments, with a focus on the MicroBooNE experiment, and will discuss the prospects of addressing the short-baseline anomalies in the near future.
E-mail: jjoshi@@bnl.gov
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Tests of Symmetries and the Electroweak Interaction / 70
Beta Decay Asymmetry Measurements with Trapped Atoms
Author: Dan Melconian1
Co-authors: A Gorelov 2; B Fenker 1; D Ashery 3; J Behr 2; M Anholm 4
1 Texas A&M University 2 TRIUMF 3 Tel Aviv University 4 University of Winnipeg
Corresponding Author: [email protected]
Nuclear β decay’s long history of shaping and testing the Standard Model of particle physics con- tinues to this day with elegant, ultra-precise low-energy nuclear measurements. Experiments ob- serving the angular correlations between the electron, neutrino and recoil momenta following beta decay can be used to search for exotic currents contributing to the dominant (V-A) structure of the weak interaction. Precision measurements of the correlation parameters to <0.1% would be sensitive to (or meaningfully constrain) new physics, complementing other searches at large-scale facilities like the LHC.
Atom traps provide an ideal source of very cold, short-lived isotopes in an extremely clean and open environment. As such, they are invaluable tools for precision measurements of beta-decay pa- rameters. The TRIUMF Neutral Atom Trap (TRINAT) collaboration utilizes neutral atom-trapping techniques with optical pumping methods to highly polarize (>99%) 37K atoms. Recently, we de- termined the beta asymmetry parameter to 0.3%, which is comparable to or better than any other nuclear measurement, including the neutron. In terms of minimal left-right symmetric models, this implies a limit of >351 GeV for the mass of a possible right-handed W . Alternatively, one may 37 interpret the result as a 4.4× better measurement of Vud from K. This talk will discuss using atom traps as a test of the electroweak interaction with particular em- phasis on TRINAT’s 37K program.
E-mail: [email protected]
Collaboration name: TRINAT
Funding source: US Dept of Energy Award No. DE-FG03-93ER40773, the Natural Sciences and Engineering Research Council of Canada, and the Israel Science Foundation
Physics at High Energies / 303
Searches for Physics Beyond the Standard Model with Third-Generation Quarks
Author: Siyuan Sun1
1 University of Michigan
Page 67 CIPANP 2018 - Thirteenth Conference on the Intersections of Particle … / Book of Abstracts
Corresponding Author: [email protected]
This talk will explore the results of current searches that utilize top and bottom quarksatATLAS, including searches for 3rd Generation SUSY particles, searches for BSM Higgs, and searches for other exotic particles.
E-mail: [email protected]
Collaboration name: ATLAS Collaboration
Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity / 33
Gravitational-Wave Transient Astronomy on the Rise
Author: Chris Pankow1
1 Northwestern University
Corresponding Author: [email protected]
The past three years have encompassed a meteoric rise of gravitational-wave astronomy withthe activation of the first advanced gravitational-wave interferometers and the subsequent direct de- tection of GW150914 — a gravitational-wave transient from a merging binary black hole. Since then, two observing runs, spanning about a year of total observation time, have been completed and recently included the kilometer-scale French-Italian Virgo instrument. The payoff, a monumental joint electromagnetic and gravitational-wave campaign surrounding GW170817, added a crucial and highly anticipated component to multi-messenger astronomy. Primary among a rich set of results, this watershed event provided an unequivocal and long-anticipated link between short gamma-ray bursts, kilonovae, and binary neutron star mergers. I will report the key results driving the birth and growth of gravitational-wave astronomy: stellar mass black hole binaries and their implications for compact binary astrophysics, tests of general relativity, and the foundation for future studies. I will also enumerate the timeline and ongoing studies of GW170817/GRB170817A. Finally, I will re- view the progression towards a truly worldwide network of second generation gravitational-wave interferometers.
E-mail: [email protected]
Collaboration name: LIGO-Virgo Collaboration
Tests of Symmetries and the Electroweak Interaction / 66
Nuclear Beta Decays and CKM Unitarity
Author: John C. Hardy1
1 Texas A&M University
Page 68 CIPANP 2018 - Thirteenth Conference on the Intersections of Particle … / Book of Abstracts
Corresponding Author: [email protected]
+ Results from superallowed β decays between 0 , T = 1 analog states yield the best value for Vud, with a precision of ±0.02%. World data now comprise 14 separate superallowed transitions hav- ing Ft values known to 0.1% precision or better. These results, which cover a wide range ofpar- ent nuclei from 10C to 74Rb, constitute a very robust data set. Each transition’s Ft value depends on its half-life, Q-value and branching ratio. It also depends on small (∼1%) transition-dependent theoretical corrections, of which the most sensitive accounts for isospin symmetry breaking. The validity of these corrections is confirmed by the excellent consistency among the14 Ft-values, an expected consequence of CVC. Recent measurements, which compare pairs of mirror superallowed transitions, further support that validity. With CVC consistency established, the result now yields Vud = 0.97420(21), which makes this by far the most precisely known element of the CKM matrix. Together with Vus and Vub, it leads to the most demanding test available of the unitarity of that matrix, with the sum of squares equaling 0.99962(49). Three other types of beta decay can be used to 1 extract Vud: the superallowed beta decay between T = 2 mirror nuclei; and the beta decays of the neutron and pion. All three are hampered by experimental challenges that have limited their Vud precision well short of that achieved with the superallowed 0+→ 0+ transitions. They are, however, statistically consistent with it.
E-mail: [email protected]
Funding source: US DOE, Office of Science, Office of Nuclear Physics Award No. DE-FG03-93ER40773 and WelchFoun- dation Grant No. A-1397
Neutrino Masses and Neutrino Mixing / 162
Characterizing Single-Phase LArTPC Detector Performance with MicroBooNE
Author: Christopher Barnes1
1 University of Michigan
Corresponding Author: [email protected]
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 attenuation of drifting electrons, as well as diffusion and recombination. Mi- croBooNE, residing on the surface, can also provide useful information about cosmic ray rate and the build up of space charge in the TPC volume. A laser calibration system has been designed and employed to investigate these important effects.
E-mail: [email protected]
DM / PPHI / 351
Search for Light Dark Matter with the MESA Accelerator
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Author: Luca Doria1
1 University of Mainz
Corresponding Author: [email protected]
At the Institute for Nuclear Physics of the Johannes Gutenberg University in Mainz, the construc- tion of the MESA facility has started. At its core there is a new superconducting energy-recovery linac which will provide intense electron beams for precision experiments in subnuclear physics. An important part of the MESA physics program consists of the search for a “dark sector” which is a candidate explanation for the longstanding dark matter problem. This talk will highlight the MESA dark sector program and in particular two experiments will be described. The first one is called MAGIX and it is a two-spectrometer set-up employing an internal gas-jet target installed on a recirculation arc of MESA. The second one is a beam-dump experiment for directly detecting dark matter particles. The experiments are in the R&D phase and the current status and future prospects will be presented.
E-mail: [email protected]
Collaboration name: MAGIX@MESA and BDX@MESA
Physics at High Energies / 41
ATLAS Searches for Diboson Resonances
Author: Ines Ochoa1
1 Columbia University
Corresponding Author: [email protected]
Many extensions to the Standard Model predicts new particles decaying into two bosons (W , Z, γ, H) making these important signatures in the search for new physics. Searches for such diboson res- onances have been performed in final states with different numbers of leptons, photons and jets b-jets where new jet substructure techniques to disentangle the hadronic decay products in highly boosted configuration are being used. The most recent results in the search for such resonances by the ATLAS experiment at the LHC will be presented, using proton-proton collision data collected at a centre-of-mass energy of 13 TeV.
E-mail: [email protected]
Collaboration name: ATLAS Collaboration
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 113
The Search for the Onset of Color Transparency
Author: Dipangkar Dutta1
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1 Mississippi State University
Corresponding Author: [email protected]
We will give an overview of a unique prediction of Quantum Chromodynamics, called color trans- parency (CT), where the final (and/or initial) state interactions of hadrons with the nuclear medium must vanish for exclusive processes at high momentum transfers. We will trace the progress of our understanding of this phenomenon, beginning with its confirmation in high energy phenomena, fol- lowed by investigations of the onset of CT at intermediate energies. We will present updates from a recent CT search experiment that was completed as one of the commissioning experiments of the newly upgraded experimental Hall C at the Jefferson Lab. We will also make connections between the CT experiment and the other commissioning experiments, which include experiments measur- ing the F2 structure function and the EMC effect. Finally, we will also discuss some new proposals that will extended the search to new unexplored phase space.
E-mail: [email protected]
Funding source: US Department of Energy, grant # DE-FG02-07ER41528
PGDNN / QMHI / 355
EIC at Small-x: Connections to p+p/A & A+A Physics at RHIC & LHC
Author: Prithwish Tribedy1
1 Brookhaven National Lab
Corresponding Author: [email protected]
Over past years DIS e+p data have provided crucial inputs to the phenomenology of p+p/A & A+A collisions. Largest uncertainties in such modeling arise from the spatial and momentum distribu- tion of partons inside nuclei at small-x. In this talk, I will discuss such issues and highlight a few recent measurements of the charge inclusive and charge dependent angular correlations from RHIC and LHC that will help us better constrain partonic distributions inside nuclei as well as inside the hadrons. I will also discuss how the lessons from RHIC & LHC can be useful to model event-by-event physics at the EIC at small-x.
E-mail: [email protected]
Neutrino Masses and Neutrino Mixing / 195
Event Reconstruction Techniques for ANNIE Phase II
Author: Jingbo Wang1
1 UC Davis
Page 71 CIPANP 2018 - Thirteenth Conference on the Intersections of Particle … / Book of Abstracts
Corresponding Author: [email protected]
The Accelerator Neutrino Neutron Interaction Experiment (ANNIE), deployed on the Booster Neu- trino Beam (BNB) at Fermilab, is planning to use a 26-ton Gd-doped water Cherenkov detector to study the multiplicity of final state neutrons from neutrino-nucleus interactions in water, which pro- vides a unique opportunity to study this physics in an energy range relevant to both atmospheric and long baseline neutrino experiments. The experiment has two main goals: (1) perform the first measurement of the abundance of neutrons from neutrino interactions in water, as a function of mo- mentum transfer, in order to constrain neutrino-nucleus interaction models, and (2) demonstrate the power of new fast-timing, position-sensitive detectors by making the first deployment of the Large Area Picosecond PhotoDetectors (LAPPDs) in a physics experiment. The Phase I of ANNIE has suc- cessfully measured the neutron background inherent to the BNB. The Phase II of ANNIE will realize the physics measurements by using the arrival time and position of the Cherenkov photons in both PMTs and LAPPDs. The interaction vertices and the charged lepton tracks are reconstructed byusing a maximum likelihood fit. The energies of the charged lepton and the neutrino are reconstructed by using Machine and Deep Leaning algorithms. This presentation will give an overview of the ANNIE Phase II simulation and present the recent development of event reconstruction techniques.
E-mail: [email protected]
Collaboration name: ANNIE
Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity / 27
Did LIGO Detect Dark Matter?
Author: Simeon Bird1
1 UCR
Corresponding Author: [email protected]
I will discuss the possibility that the black-hole binary detected by LIGO may be a signature of primordial black hole dark matter. If two BHs in a galactic halo pass sufficiently close, they radiate enough energy in gravitational waves to become gravitationally bound. Curiously, the expected merger rate from these objects overlaps with that predicted by LIGO. Although a PBH dark matter fraction of unity is now ruled out, a smaller fraction is still plausible.
E-mail: [email protected]
Tests of Symmetries and the Electroweak Interaction / 13
Recent Status of Weak-Interaction Tests via Precision Superal- lowed Beta-Decay Measurements at TRIUMF
Author: Kyle Leach1
1 Colorado School of Mines
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Corresponding Author: [email protected]
Tests of the Standard Model through precision measurements of nuclear decay properties have proven to be a valuable tool in experimental subatomic physics. Of these investigations, 0+ → 0+ β-decay decay data are among the most important, as they currently provide the most precise de- terminations of both the vector coupling strength in the weak interaction, GV , and the up-down element of the CKM quark mixing matrix, Vud. These studies also provide some of the best con- straints on the possibility of additional quark generations, as well as limits on exotic currents in the weak interaction. The three quantities that are required for performing these tests (branching ratio, half-life, and Q-value) can all be measured to high-precision with rare-isotope beams at the TRIUMF- ISAC facility in Vancouver, Canada. In this talk, I will highlight recent experimental work with both the GRIFFIN spectrometer and the TITAN ion-trap system, as well as theoretical advances towards first-principle nuclear-structure corrections. Finally I will provide a picture of where the remaining critical measurements still reside, and where work at TRIUMF is headed in the near future.
E-mail: [email protected]
Collaboration name: GRIFFIN and TITAN Collaborations
Funding source: This work is supported by the US DOE under grant No. DE-SC0017649 and NSERC (Canada). TRIUMF receives funding via the NRC (Canada).
Physics at High Energies / 163
Mining the LHC Data for Anomalies
Author: Angelo Monteux1
1 UC Irvine
Corresponding Author: [email protected]
We describe a novel, model-independent technique of “rectangular aggregations” for mining the LHC data for hints of new physics. A typical (CMS) search now has hundreds of signal regions, which can hide the presence of potentially interesting anomalies. Applying our technique to the two CMS jets+MET SUSY searches, we identify a set of previously overlooked ∼ 3σ excesses, characterized by low jet multiplicity, zero b-jets, and low MET and HT. We discuss the presence of a bump in the similar ATLAS monojet search, and discuss a simplified model that provides an excellent combined fit to these excesses and discuss all additional constraints.
E-mail: [email protected]
DM / PPHI / 265
Searching for New Forces with Dark Light
Author: Ross Corliss1
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1 MIT
Corresponding Author: [email protected]
Cosmic motivations and anomalies in precision measurements have encouraged standard model ex- tensions in the form of Dark Photons or, more generically, a new force-carrier. Existing experimental searches for such particles have probed the majority of the parameter space of simple models, but so far no culprit has been found and the standard-model anomalies remain unexplained. The recent report of anomalous correlations in 8Be transitions has heightened interest in a potential new particle near 17 MeV. Although this region has been partially explored via hadronic produc- tion mechanisms, a particle with proto-phobic couplings is more effectively probed using leptonic production. The DarkLight experiment proposes to search for this particle in the invariant massspec- trum of e+e− pairs produced in electron-nuclear scattering. I will give an overview of the staged approach we have taken, including recent tests at the LERF facility at JLab and designs for a future large-acceptance detector, and also our near-term proposal to install a spectrometer pair at the CE- BAF Injector to search for this signal in an intensity regime where backgrounds from accidental coincidence dominate.
E-mail: [email protected]
Collaboration name: DarkLight Collaboration
Funding source: This work is supported by DOE grants DE-FG02-94ER40818 and DE-SC0011970, and NSF MRIgrant PHY-1437402
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 134
The Search for the Color Transparency in Hall C at Jefferson Lab
Author: Holly Szumila-Vance1
1 Jefferson Lab
Corresponding Author: [email protected]
Color transparency (CT) is a fundamental phenomenon of QCD postulating that at high momentum transfer hadrons fluctuate to a small color neutral transverse size in the nucleus, and final statein- teractions within the nuclear medium are suppressed. CT is observed experimentally as a rise in the measured nuclear transparency as a function of the momentum transferred. While CT has been observed for mesons, it remains unconfirmed in baryons. Observation of CT in baryons would pro- vide a new handle for understanding the nuclear strong force and the first observations of hadrons fluctuating to a small size in the nucleus. An enhancement in the nuclear transparency wasobserved in A(p, 2p) reactions at Brookhaven. This experiment seeks to confirm the measurement of proton transparency as well as to measure the onset. During the spring of 2018, this experiment was the first to run in Hall C at Jefferson Lab using the recently upgraded 12 GeV electron beam andobtained four kinematic points covering the region where Brookhaven previously observed an enhancement. This experiment used the High Momentum Spectrometer (HMS) and Super High Momentum Spec- trometer (SHMS) in coincidence to measure A(e, e′p). This talk will summarize the status ofthe experiment since the completion of data taking this spring.
E-mail: [email protected]
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Collaboration name: E12-06-107 Collaboration
Funding source: U.S. DOE Grant Number: DE-FG02-07ER41528
PGDNN / QMHI / 30
Hadron in Jet Fragmentation
Author: Felix RingerNone
Corresponding Author: [email protected]
Collimated jets of hadrons and their substructure play a central role at present day and future collider experiments. In particular in the past years, it has been realized that the measurement of hadron distributions inside jets can provide valuable information about QCD. On the one hand, identified hadrons can be used to precisely map out the energy distribution inside jets both in the longitudinal and transverse direction. On the other hand, new insights into the QCD hadronization mechanism can be obtained. By first reconstructing jets in the final state, these new observables capture addi- tional information about the final state event topology compared to traditional hadron spectra. In this talk, I review the significant progress that has been made recently both from the theoretical and the experimental side.
E-mail: [email protected]
Neutrino Masses and Neutrino Mixing / 34
Theia: A Multi-Purpose Water-Based Liquid Scintillator Detec- tor
Author: Vincent Fischer1
1 UC Davis
Corresponding Author: [email protected]
Recent developments in the field of liquid scintillator chemistry and fast-timing photosensors paved the way for a new generation of large-scale detectors capable of tackling a broad range of physics issues. Water-based Liquid Scintillator (WbLS) is a novel detection medium that combines the ad- vantages of pure water, including low attenuation, accurate direction reconstruction, and low cost, and those of liquid scintillator, including high light yield and low-threshold detection. When cou- pled with high efficiency, fast-timing photosensors, such as Large Area Picosecond PhotoDetectors (LAPPDs), WbLS exhibits an immense potential for neutrino physics and BSM searches. Theia is a 50-kiloton multi-purpose neutrino detector that aims to jointly deploy these two technologies in order to fulfill its physics program objectives, including the determination of the neutrino masshier- archy and the CP violation phase in the leptonic sector, the detection of solar, reactor, and supernova neutrinos, and the search for neutrinoless double beta decay and proton decay. This presentation will describe the physics potential and the experimental setup of the Theiadetec- tor.
E-mail:
Page 75 CIPANP 2018 - Thirteenth Conference on the Intersections of Particle … / Book of Abstracts [email protected]
Collaboration name: Theia
Tests of Symmetries and the Electroweak Interaction / 3
New Evaluation of the γW -box Correction to 0+ − 0+ Nuclear β- Decay and Vud Extraction
Author: Mikhail Gorshteyn1
1 Mainz University
Corresponding Author: [email protected]
Current most precise knowledge of the value of Vud is obtained from the analysis of a number of superallowed nuclear β-decays. At present, the main limitation in precision of this determination is due to radiative corrections, more specifically the “inner” γW -box correction that is independent of the electron spectrum but depends on hadronic structure. A novel dispersion formulation of the γW -box is developed. It allows to test the validity and improve the previous evaluation of Marciano and Sirlin, which was based on several semi-empiric assumptions. Further effects, such as possible effects of the nuclear excitations both on inner and outer corrections are discussed.
E-mail: [email protected]
Physics at High Energies / 9
Theoretical Results for Charged-Higgs Production
Author: Nikolaos Kidonakis1
1 Kennesaw State University
Corresponding Author: [email protected]
I discuss charged-Higgs production via two different processes: in association with a top quark, and in association with a W boson. I present total cross sections and differential distributions that include higher-order corrections from soft and collinear gluon emission. I show that these radiative corrections are significant.
E-mail: [email protected]
Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity / 288
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The Cosmic Origin of the Heavy Elements: Implications fromthe Neutron Star Merger GW170817
Author: Daniel Siegel1
1 Columbia University
Corresponding Author: [email protected]
The recent detection of the binary neutron star merger GW170817 by LIGO and Virgo wasfollowed by a firework of electromagnetic counterparts across the entire electromagnetic spectrum. In partic- ular, the ultraviolet, optical, and near-infrared emission is consistent with a kilonova that provided strong evidence for the formation of heavy elements in the merger ejecta by the rapid neutron cap- ture process (r-process). In this talk, I will discuss our current understanding of how kilonovae are produced by neutron star mergers and how r-process nucleosynthesis in these outflows can explain the cosmic origin of the heavy elements in the universe, which has been an enduring mystery for more than 70 years.
E-mail: [email protected]
DM / PPHI / 260
Resonance Search for a Heavy Photon with the Heavy Photon Search Experiment
Author: Omar Moreno1
1 SLAC National Accelerator Laboratory
Corresponding Author: [email protected]
The Heavy Photon Search (HPS) experiment at Jefferson Lab is searching for a hypothetical new / U(1) vector boson (”heavy photon”, “dark photon” or A ) in the mass range of 20–500 MeV/c2. / An A in this mass region is natural in hidden sector models of light, thermal dark matter. The / A couples to the ordinary photon through kinetic mixing, which induces its coupling to electric charge. Since heavy photons couple to electrons, they can be produced through a process analogous to bremsstrahlung, subsequently decaying to an e+e−, which can be observed as a narrow resonance above the dominant QED trident background. For suitably small couplings, heavy photons travel detectable distances before decaying, providing a second signature. Using the CEBAF electron beam, located at the Thomas Jefferson National Accelerator Facility, incident on a thin tungsten target, along with a compact, large acceptance forward spectrometer consisting of a silicon vertex tracker and lead tungstate electromagnetic calorimeter, HPS can access unexplored regions in the mass- coupling parameter space. HPS conducted successful engineering runs in 2015 using a 1.056 GeV, 50 nA beam and 2016 using a 2.3 GeV, 200 nA beam. This talk will present the results of a resonance search for a heavy photon using the 1165 nb−1 (7.29 mC) of data collected during the 2015 engineering run.
E-mail: [email protected]
Collaboration name: Heavy Photon Search
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DM / PPHI / 366
The APEX Experiment at Jefferson Lab: A Search for a NewVector Boson
Author: Seamus Riordan1
1 Argonne National Laboratory
Corresponding Author: [email protected]
The A’ Experiment, or APEX, aims to search for a new vector boson that kinetically mixes withthe photon, a “dark photon” or a “heavy photon”, with a mass of O(100 MeV) by studying the invariant mass spectrum of e+e− pairs produced from an electron beam on a high-Z target. Dark photons appear in many well-motivated extensions of the Standard Model and may mediate interactions between dark matter and ordinary matter. APEX will extend current constraints on the mixing parameter by a factor of a few for dark photon masses near 100 MeV. APEX is scheduled to take data at Jefferson Lab in early 2019, taking advantage of the high duty-factor electron beam and usingthe twin symmetric high resolution spectrometers in Hall A. An overview of the current constraints for such a boson and experimental plans will be presented.
E-mail: [email protected]
Collaboration name: APEX Collaboration
Funding source: Work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357.
Plenary 5 / 207
Recent Results on Heavy Flavor Production in High Energy Nu- clear Collisions
Author: Xin DongNone
Corresponding Author: [email protected]
The goal of the ultra-relativistic heavy ion program is to study Quantum Chromodynamics under finite temperature and density conditions. After a couple of decades of experiment, the focusatthe top RHIC and the LHC energy has evolved to quantitative understanding of properties of the hot and dense medium, namely the strongly-coupled Quark Gluon Plasma (sQGP) created in these heavy- ion collisions, and to constrain transport parameters of the sQGP medium. Heavy quarks offer unique insights towards detailed understanding of the sQGP properties due to their large masses. Recent collider and detector advances have enabled precision measurements of heavy quark hadron production in heavy-ion collisions. In this talk, I will review recent results from heavy quark production measurements at RHIC and the LHC. These high quality data will offer stringent constraints on theoretical model calculations and help precision determination of QGP medium transport parameters. Finally, I look forward to a more prospective future of the heavy quark program with further improved detectors at both RHIC and the LHC.
E-mail:
Page 78 CIPANP 2018 - Thirteenth Conference on the Intersections of Particle … / Book of Abstracts
Plenary 5 / 75
Status of Searches for Chiral Magnetic Effects in Nuclear Colli- sions
Author: Wei Li1
1 Rice University
Corresponding Author: [email protected]
The Chiral Magnetic Effect (CME) is the phenomenon of electric charge separation along theexternal magnetic field that is induced by the chirality imbalance. In relativistic nucleus-nucleus collisions, local chirality imbalance of left- and right-handed quarks may be generated, which is related to the topology of gluon gauge fields. With the presence of an extremely strong magnetic field, the CME has been predicted to occur, leading to final-state electric charge separations along the poles of the lenticular-shaped medium created. In this talk, I will review the latest status of experimen- tal searches for the chiral magnetic effects in nuclear collisions at RHIC and the LHC, and discuss exciting opportunities with programs planned in the near future.
E-mail: [email protected]
Plenary 5 / 302
Physics with an Electron-Ion Collider
Author: Ernst SichtermannNone
Corresponding Author: [email protected]
An Electron-Ion Collider, proposed in the U.S. as facility upgrades to Jefferson Lab or the Relativistic Heavy Ion Collider, would offer unique capabilities to study quarks and gluons in nucleons andnuclei using flexible collision energies, high luminosity, and high polarization. It would make itpossible to image quarks and gluons in nucleons and nuclei, to characterize their QCD dynamics, and to explore phenomena at high gluon density. This talk will highlight the science, key measurements, and prospects for realization.
E-mail: [email protected]
Funding source: U.S. Department of Energy, Office of Science (NP)
Plenary 6 / 89
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Recent Results from Dark Matter Direct Detection Experiments
Author: Kaixuan Ni1
1 UC San Diego
Corresponding Author: [email protected]
The worldwide effort of direct dark matter detection has made tremendous progress towardsthe understanding of dark matter. New results were reported recently from several experiments using techniques across from noble liquids, bubble chambers, cryogenic bolometers, scintillating crystals and low-threshold detectors, covering a large dark matter mass range and constraining new param- eter space for the dark matter interaction cross sections. Are we at the brink of a discovery, orwill we soon encounter the unavoidable neutrino background? I will review the recent results with a prospect towards the future.
E-mail: [email protected]
Plenary 6 / 104
New Directions in the Search for Light and Ultralight Dark Mat- ter
Author: Tongyan Lin1
1 UCSD
Corresponding Author: [email protected]
Dark matter candidates span the entire mass range from ∼ 10−22 eV up to the weak scale and beyond. Recently, the scope of dark matter searches has significantly expanded to include a variety of motivated candidates over much of this mass range. I will discuss new ideas and prospects to directly detect “light” (sub-GeV) and “ultralight” (sub-eV) dark matter, generalizing searches for WIMPs or axion dark matter. I will highlight several examples covering the meV–GeV mass range, including prospects for absorption of bosonic dark matter as well as proposals to detect scattering of sub-MeV dark matter.
E-mail: [email protected]
Plenary 6 / 83
Coherent Scattering and the Flavor Physics and Detection of Su- pernova Neutrinos
Author: Kate Scholberg1
1 Duke University
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Corresponding Author: [email protected]
Coherent elastic neutrino-nucleus scattering (CEνNS) is a neutral-current process in which a neu- trino scatters off an entire nucleus, depositing a tiny recoil energy. The process is importantin core-collapse supernovae and also presents an opportunity for detection of a burst of core-collapse supernova neutrinos in low-threshold detectors designed for dark matter detection. This talk will discuss the physics of CEνNS, its importance in core collapse, and prospects for supernova burst detection in low-threshold recoil detectors.
E-mail: [email protected]
Plenary 6 / 31
IceCube: Opening a New Window on the Universe from the South Pole
Author: Francis Halzen1
1 WIPAC, UW-Madison
Corresponding Author: [email protected]
The IceCube project has transformed a cubic kilometer of natural Antarctic ice into a neutrino detec- tor. The instrument detects more than 100,000 neutrinos per year in the GeV to PeV energy range. Among those, we have isolated a flux of high-energy cosmic neutrinos. I will discuss the instru- ment, the analysis of the data, the significance of the discovery of cosmic neutrinos, and the recent multimessenger observation of a flaring TeV blazar in coincidence with the IceCube neutrino alert IC170922. The large cosmic neutrino flux observed implies that the Universe’s energy densityin high-energy neutrinos is the same as that in gamma rays, suggesting that the sources are connected and that a multitude of astronomical objects await discovery.
E-mail: [email protected]
Collaboration name: IceCube
Funding source: NSF
QCD, Hadron Spectroscopy, and Exotics / 292
Two-Photon Effects in Elastic Nucleon Form Factors
Author: Marc Vanderhaeghen1
1 University Mainz
Corresponding Author: [email protected]
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In view of the proton radius puzzle and the precision currently achieved in extracting the proton radius from muonic Hydrogen spectroscopy, the two-photon exchange (TPE) corrections between the lepton and hadron are at present the largest source of hadronic uncertainty. I present an overview on recent work within a dispersion relation framework to estimate such TPE corrections both in elastic electron-proton and muon-proton scattering as well as in the interpretation of the muonic Hydrogen spectroscopy. The results are compared to recent CLAS, VEPP-3 and OLYMPUS dataas well as to a full TPE calculation in the near-forward approximation, based on unpolarized structure function input. The next steps in this field will be discussed.
E-mail: [email protected]
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 190
New Studies of the EMC Effect and Short-Range Correlations
Author: Or Hen1
1 MIT
Corresponding Author: [email protected]
I will present results from new studies of short-ranged correlations in nuclei and the EMC effect, with emphasis on measurements of neutron-rich nuclei. I will also discuss the development of new effective theories for describing short-ranged correlations, the way in which they relate toexperi- mental observables, and the emerging universality of short-distance and high-momentum physics in nuclear systems.
E-mail: [email protected]
Neutrino Masses and Neutrino Mixing / 236
Status of the nEXO Experiment
Author: Shuoxing Wu1
1 Stanford University
Corresponding Author: [email protected]
The planned next generation Enriched Xenon Observatory (nEXO) experiment is aiming tosearch for the neutrino-less double beta (0νββ) decay from 136Xe. nEXO has a sensitivity in the order of 28 136 10 years on the half-life (T1/2) of 0νββ decay from Xe after 10 years’ running, entirely covering the inverted mass hierarchy region. The nEXO detector is a time projection chamber (TPC). Ithas a cylindrical shape with a diameter of ∼1.3 m and a drift length of ∼1.2 m containing 5 tonnes of liquid xenon enriched to 90% (136Xe). nEXO will use modular metal pads deposited on a quartz substrate to readout the ionisation signal and provide the spatial information of the event. nEXO will be implemented with ∼4 m2 silicon photomultiplier (SiPM) to collect the scintillation light in addition to the charge signal. Combining both charge and light signals, nEXO aims to have an energy resolution of 1% at the Q-value of the double beta decay from 136Xe. In this talk, both the physics potential of nEXO and various R&D outcomes will be presented.
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E-mail: [email protected]
Collaboration name: nEXO
Quark Matter and High Energy Heavy Ion Collisions / 313
Influence of the QCD Equation of State by System Size
Author: Jacquelyn Noronha-Hostler1
1 Rutgers University
Corresponding Author: [email protected]
A long standing question in the field of heavy-ion collisions is whether charm quarks are thermalized within the Quark Gluon Plasma. In recent years, progress in lattice QCD simulations hasledto reliable results for the equation of state of a system of 2+1 flavors (up, down, and strange) and 2+1+1 flavors (up, down, strange, and charm). We find that the equation of state strongly affects differential flow harmonics and a preference is seen for thermalized√ charm quarks at the LHC. Predictions are also made for the event-plane correlations at RHIC Au–Au sNN = 200 GeV collisions, and the scaling√ of differential flow observables and factorization√ breaking for all charged particles atLHC Pb–Pb sNN = 5.02 TeV collisions compared to LHC Xe–Xe sNN = 5.44 TeV collisions, which could be useful in answering the question: are charm quarks thermalized?
E-mail: [email protected]
Dark Matter / 358
Supernova 1987A Constraints on Sub-GeV Particles
Author: Samuel McDermott1
1 FNAL
Corresponding Author: [email protected]
Supernova 1987A created an environment of extremely high temperatures and nucleon densities. The rough agreement between predictions of core collapse models and observations of a “neutrino burst” provide an opportunity to set bounds on a wide range of theories of new physics. I will present new bounds on dark sector models, incorporating finite-temperature effects on the production and trapping of a dark photon and millicharged particles, nuclear effects for the coupling to axions, and a more realistic model of the high-mixing parameter space than in previous work. This has dramatic effects for the landscape of such models.
E-mail: [email protected]
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Parton and Gluon Distributions in Nucleons and Nuclei / 214
Glue Spin from Lattice QCD
Author: Keh-Fei Liu1
1 University of Kentucky
Corresponding Author: [email protected]
The formulation of the glue spin operator and large momentum effective theory will bereviewed and a direct calculation of the glue spin from the lattice calculation with chiral fermion action will be presented. The lattice calculation is carried out with overlap fermion on 2+1 flavor domainwall fermion configurations. Both the overlap and domain wall fermions are chiral fermions. Aglobalfit with large momentum extrapolation on multiple lattices with 4 lattice spacings and one at physical pion mass to assess the systematic errors has been undertaken to reach the final result.
E-mail: [email protected]
Collaboration name: χQCD Collaboration
Funding source: DOE Nuclear Physics
Physics at High Energies / 42
Searches for New Phenomena in Leptonic Final States Using the ATLAS Detector
Author: Sebastien Rettie1
1 The University of British Columbia
Corresponding Author: [email protected]
Many theories beyond the Standard Model predict new phenomena which decay to well isolated, high-pt leptons. Searches for new physics models with these signatures are performed using the ATLAS experiment at the LHC. The results reported here use the pp collision data sample collected by the ATLAS detector at the LHC with a centre-of-mass energy of 13 TeV.
E-mail: [email protected]
Collaboration name: ATLAS Collaboration
Neutrino Masses and Neutrino Mixing / 242
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Demonstration of Single Barium Ion Sensitivity for Neutrinoless Double Beta Decay Using Single Molecule Fluorescent Imaging
Authors: Austin McDonald1; Ben Jones1; David Nygren1
1 University of Texas at Arlington
Corresponding Author: [email protected]
A new method to tag the barium daughter in the double beta decay of 136Xe is described, based on adaptation of the single molecule fluorescent imaging (SMFI) technique. Individual barium dications chelated on a transparent plate are detected at a significance of 12.9 σ, with a spatial resolution of 2 nm rms. Observation of a single-step photo-bleach transition confirms the interpretation of single ion sensitivity. This result is the first step toward an essentially background-free technique inthe search for neutrino-less double beta decay in 136Xe, based on robust event discrimination by SMFI in a high-pressure xenon gas TPC.
E-mail: [email protected]
Collaboration name: NEXT Collaboration
Quark Matter and High Energy Heavy Ion Collisions / 315
CMS Results on Small Systems
Author: Zhenyu Chen1
1 Rice University
Corresponding Author: [email protected]
In recent years, a wealth of experimental evidence has suggested the presence of novel collectivity in small collision systems such as p–p and p–Pb with high-multiplicity final states. The origin of the observed collectivity is under intense debate, i.e., whether a strongly coupled quark-gluon medium is formed, similar to that in large heavy ion collisions. Latest results at CMS in small systems will be presented. These results will provide new insights in unraveling the nature of collectivity insmall but dense QCD systems.
E-mail: [email protected]
Collaboration name: CMS Collaboration
Dark Matter / 262
Initial Dark Matter Results from the SuperCDMS Single-Charge Sensitive Detectors
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Author: Francisco Ponce1
1 Stanford University
Corresponding Author: [email protected]
Astronomical evidence over the past several decades points to a Universe composed primarily of Dark Matter. There are several competing hypotheses about the composition and the interaction mechanisms of Dark Matter. Several groups have assembled instruments to test these ideasby searching for the hypothesized interaction, but despite their best efforts no direct detection has been confirmed to date. The Super Cryogenic Dark Matter Search (SuperCDMS) SNOLAB exper- iment is the successor to SuperCDMS Soudan and CDMS II experiments, which for the past two decades focused on the direct detection of dark matter particles. Currently, the next generation of high-resolution SuperCDMS HV detectors are being developed and recently a 0.93 g prototype with a charge resolution of 0.1 electron-hole pairs (CDMS HVeV) was produced. A 0.49-gram day exposure with minimal overburden was taken using the CDMS HVeV detector. The first limits on inelastic electron scattering dark matter and dark photon absorption are presented. The limits for thedark matter-standard model particle interaction significantly improve experimental constraints ondark matter particles with masses as low as 1 MeV. These results demonstrate the scientific potentialof phonon-mediated semiconductor detectors that are sensitive to single electronic excitations.
E-mail: [email protected]
Collaboration name: SuperCDMS
Funding source: DOE, NSF
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 213
Isospin Dependence of the EMC Effect and Nucleon Short-Range Correlations
Author: Barak Schmookler1
1 Massachusetts Institute of Technology
Corresponding Author: [email protected]
The number of Short-Range Correlated (SRC) pairs in nuclei is known to linearly correlate with the strength of the European Muon Collaboration (EMC) effect. This linear correlation has lead to theoretical models of the EMC effect where primarily nucleons which are members of SRC pairsare modified. As recent work has shown, the overwhelming majority of these SRC pairs are neutron- proton (np) pairs. A consequence of np pair dominance is an isospin dependence to the EMC effect. By constructing per-neutron and per-proton SRC and EMC cross-section ratios, we show that a larger fraction of protons than of neutrons are modified in asymmetric, neutron-rich nuclei. With these new normalizations, we find that the per-neutron EMC slopes and SRC ratios both saturate much sooner than the standard per-nucleon quantities, starting already with carbon; while the per- proton values continue to increase, even going from iron to lead. In addition, we extract a universal EMC modification function based on the assumption of np pair dominance.
E-mail: [email protected]
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Physics at High Energies / 336
Searches for BSM Physics with the CMS Detector
Author: Sunil Somalwar1
1 Rutgers University/Dept of Physics
Corresponding Author: [email protected]
Discovery of the Higgs boson at the Large Hadron Collider completed the Standard Model puzzle. However, we still do not know why the Higgs boson is light, what is the makeup of the dark matter, how matter survived in the evolution of the universe, etc. LHC’s treasure-trove of proton-proton collision data could allow us to better understand the mysteries of the nascent universe and theHiggs mass. The CMS Collaboration has a broad program of searches which target heavy resonances, long- lived particles and other objects predicted by various theoretical models. I will describe how the CMS experimentalists are sorting through the LHC collision data to go Beyond the Standard Model. The focus of the talk will be on recent results obtained using data collected at Run-II of the LHC.
E-mail: [email protected]
Collaboration name: CMS Collaboration
Parton and Gluon Distributions in Nucleons and Nuclei / 59
Overview of Longitudinal Spin Physics Results from RHIC
Author: Ming Liu1
1 Los Alamos National Laboratory
Corresponding Author: [email protected]
The Relativistic Heavy Ion Collier (RHIC) at Brookhaven National Laboratory has been in operation since 2001 and delivered the world’s highest energy polarized proton-proton collisions with the center of mass energy up to 510 GeV. This has provided a unique opportunity to study the polarized quark and gluon spin structures inside the proton and novel QCD dynamics in longitudinally and transversely polarized proton-proton collisions at high energy. In this talk, I will highlight the latest longitudinal spin physics results from the PHENIX and STAR experiments at RHIC, including studies of the gluon and flavor identified quark polarizations inside the proton, followed by abrief discussion of the future prospects of spin physics opportunity at RHIC.
E-mail: [email protected]
Collaboration name: RHIC
Funding source: DOE NP
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Quark Matter and High Energy Heavy Ion Collisions / 330
PHENIX Results on Collectivity in Small Systems
Author: Sylvia Morrow1
1 Vanderbilt University
Corresponding Author: [email protected]
To answer the question of how small a system can be while still exhibiting collective behavior, the PHENIX experiment has used RHIC’s extraordinary versatility to design a set of experiments con- trolling the initial geometry of the collisions by selecting different colliding species, p/d/3He+Au. In addition, a beam energy scan with d+Au collisions was done to vary the lifetime of the system while keeping the initial geometry constant. In this talk we show PHENIX measurements of elliptic and triangular flow of charged hadrons and elliptic flow of identified hadrons at midrapidity as a function of transverse momentum in p/d/3He+Au collisions at 200 GeV per nucleon center-of-mass energy. Measurements of elliptic flow of charged hadrons in d+Au collisions at 200, 62.4, 39, and 19.6 GeV per nucleon center-of-mass energy will also be presented as a function of transverse momentum and pseudorapidity. In order to assess the origin of collectivity in the smallest systems, these results are compared with several theoretical models that produce azimuthal particle correlations based on initial and/or final state effects. Hydrodynamical models which include a droplet of quark gluon plasma provide the best simultaneous description of our observations.
E-mail: [email protected]
Collaboration name: PHENIX
Neutrino Masses and Neutrino Mixing / 6
Overview of Decay-At-Rest Neutrino Sources
Author: Daniel Winklehner1
1 MIT
Corresponding Author: [email protected]
Recently, the idea of Decay-At-Rest (DAR) neutrino sources has gained in popularity due to their well understood energy spectrum and flavor composition. Currently, there are experiments being proposed which use decay-at-rest from kaons, pions, muons, and isotopes. I will present an overview of the decay-at-rest process, and the experiments being developed. After looking at the bigger pic- ture, I will focus on particle accelerator driven decay-at-rest and the technology necessary to achieve the experimental goals (e.g. discovering sterile neutrinos).
E-mail: [email protected]
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Collaboration name: DAEdALUS
Dark Matter / 64
Status and Prospects of CDEX-10
Author: qian Yue1
1 Tsinghua University
Corresponding Author: [email protected]
There is compelling evidence that about one-quarter of the energy density of the Universe ismade up of Dark Matter, the identification and study of which are among the most important goalsin basic research. The China Dark Matter Experiment (CDEX) pursues direct searches of light Weakly Interacting Massive Particles (WIMPs) at the China Jinping Underground Laboratory (CJPL), which is the deepest operating laboratory for astroparticle research in the world. Recent results from a prototype CDEX-1 pPCGe (p-type Point Contact Germanium) detector and CDEX-10 array detector system are reported. The CDEX-10 experiment with a PCGe array of 10 kg target mass range isstill taking data. The CDEX program evolves into the targets of “CDEX-1T Experiment” with ton-scale germanium detector arrays, which will be composed of thousands of kg-mass prototype germanium detectors and further contribute to the studies of Dark Matter search and Neutrinoless Double Beta Decay. The key technologies including HPGe detector fabrication, crystal growth and so on hasbeen pursued. A new large space in CJPL-II will be ready by the end of 2018 for CDEX experiment.
E-mail: [email protected]
Collaboration name: CDEX Collaboration
QCD, Hadron Spectroscopy, and Exotics / 257
High Q2 Elastic Form Factor Program at Jefferson Lab
Author: Andrew Puckett1
1 University of Connecticut
Corresponding Author: [email protected]
The electromagnetic form factors (EMFFs) of the nucleon, measured in elastic electron-nucleon scat- tering, are among the simplest and most well-defined measurable dynamical properties of the nu- cleon, and serve as important benchmarks for the testing of theoretical models and ab initio lattice QCD calculations of nucleon structure. They also provide stringent, model-independent constraints on the extraction of Generalized Parton Distributions (GPDs), particularly at large values of the mo- mentum transfer Q2. Precise knowledge of the EMFFs over a wide Q2 range is also essential to the interpretation of many other experiments in nuclear and particle physics. In the last two decades, the use of polarization observables has dramatically increased our knowledge of the nucleon EMFFs at large Q2 values. Such measurements are presently a unique worldwide capability of Jefferson Lab’s Continuous Electron Beam Accelerator Facility (CEBAF). In this talk, I will present the near-future
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program of high-Q2 nucleon EMFF measurements at CEBAF, exploiting the recently-completed up- grade of CEBAF to a maximum beam energy of 11 GeV (for electron-beam experiments), and the complementary capabilities of experimental Halls A, B, and C. Central to this program is the new Super BigBite Spectrometer (SBS), which is specifically designed to enable the high-Q2 EMFF pro- gram. Time permitting, I will also discuss prospects for higher-Q2 EMFF measurements at a future polarized electron-ion collider (EIC).
E-mail: [email protected]
Funding source: US Department of Energy, Office of Science (Award ID DE-SC0014230)
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 100
Short-Range Correlations
Author: Zhihong Ye1
1 Argonne National Lab
Corresponding Author: [email protected]
Due to the highly localized feature of the short-range correlations (SRCs), the high momentum tails from light to heavy nuclei reveals very similar distributions when their momenta are above the Fermi momentum. The exclusive measurements of proton and electron scattering off the NN pairs in2N- SRC showed the dominance of np pairs. It indicates the isospin nature of the NN interaction at short distance. With the measurements of inclusive electron scattering on different nuclei in the quasi- elastic region, we are able to study the two- and three- nucleon correlations (2N-SRC and 3N-SRC), by taking the cross-section ratios of heavy nuclei to light nuclei, such as Deuteron or He3. While the 2N-SRC has been observed with good agreement at SLAC in 1980s, and recently in Hall-B and Hall-C at Jefferson Lab, however, there is still no clear evidence of the 3N-SRC because bothresults show no agreement. The most recent experiment in Hall-A, E08014, performed a more precious measurement on the 3N-SRC as well as the isospin dependence of SRCs. The new results revealed no clear signal of 3N-SRC plateau at the x > 2 region. The next generation experiments using H3/He3 targets, which have been taking data in 2018, will further investigate the SRC effects both in exclusive and inclusive scattering. In this talk, I will briefly introduce the SRCs, results from previous measurements and most recent experiments, and introduce the ongoing experiments, followed by some discussions.
E-mail: [email protected]
Funding source: DE-AC02-06CH11357
Quark Matter and High Energy Heavy Ion Collisions / 346
Signatures of Hydrodynamic Behavior in Small Collision Systems
Author: Giuliano Giacalone1
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1 IPhT Saclay
Corresponding Author: [email protected]
A well-established hydrodynamic framework has been developed over the last couple of decades to describe the dynamics of the fluidlike system (potentially, a quark-gluon plasma) created in relativis- tic heavy-ion collisions. This framework predicts in particular the nontrivial patterns of long-range azimuthal correlations which are observed in the final states of nucleus-nucleus collisions, and has been able to explain, essentially, all data on azimuthal correlations collected at the BNL Relativistic Heavy Ion Collider (RHIC) and at the CERN Large Hadron Collider (LHC). A striking result of the LHC is the observation of the same patterns of azimuthal correlations in the final states of smaller collision systems, namely, p+p and p+Pb collisions. Such observations triggered immediately the question of whether a tiny droplet of fluidlike matter may be created in these small systems. Nowadays this is a subject under intense study, both theoretically and in experiments. In this talk, I present our understanding of small systems in the hydrodynamic framework. By means of very simple arguments, I explain how the paradigms of the hydro picture turn out to be powerful tools allowing for predictions which are robust and universal, i.e., independent of the details of the models used to obtain the numerical results. I show that these generic predictions are all confirmed with an impressive accuracy by LHC p+Pb data, as well as by RHIC p+Au, d+Au, and 3He+Au data. I eventually discuss p+p collisions, where the signatures of hydrodynamic behavior appear to be less visible.
E-mail: [email protected]
Physics at High Energies / 138
EFT for Higgs Physics
Author: Chris Murphy1
1 Brookhaven
Corresponding Author: [email protected]
The ATLAS and CMS collaborations have recently released significant new data on Higgs anddibo- son production in LHC Run 2. Measurements of Higgs properties have improved in many channels, while kinematic information for h → γγ and h → ZZ can now be more accurately incorporated in + − fits using the STXS method, and W W diboson production at high pT gives new sensitivity to de- viations from the Standard Model. We have performed an updated global fit to precision electroweak data, W +W − measurements at LEP, and Higgs and diboson data from Runs 1 and 2 of the LHC in the framework of the Standard Model Effective Field Theory (SMEFT), allowing all coefficients to vary across the combined dataset, and present the results in both the Warsaw and SILH operator bases. We exhibit the improvement in the constraints on operator coefficients provided by the LHC Run 2 data, and discuss the correlations between them. We also explore the constraints our fit results impose on several models of physics beyond the Standard Model.
E-mail: [email protected]
Dark Matter / 371
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SENSEI Experiment for Direct Search of Light Dark Matter
Author: Guillermo Fernandez Moroni1
1 Fermilab
Corresponding Author: [email protected]
We present the status and prospects of the Sub-Electron Noise Skipper Experimental Instrument (SENSEI) that uses a non-destructive readout technique to achieve stable readout for 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 that is stable over millions of pixels on a large-area detector. This low threshold allows for unprecedented sensitivity to the largely unexplored, but theoretically well-motivated, area of sub-GeV dark matter models. We’ll discuss the reach and prospects ofthe SENSEI experiment currently under construction, which will use 100 grams of Skipper CCDs. We will also present the lessons learned from a small scale prototype currently operating in the MINOS cavern at Fermilab.
E-mail: [email protected]
Collaboration name: SENSEI Collaboration
Parton and Gluon Distributions in Nucleons and Nuclei / 11
Nucleon Spin Structure Measurements at JLab
Author: Alexandre Deur1
1 Jefferson Lab
Corresponding Author: [email protected]
We will summarize the longitudinal and transverse spin measurements at JLAB. First, we will present the published and preliminary experimental results. They belong to a first phase of research using JLab’s 6 GeV beam that covered the interface between the perturbative and nonperturbative domains of QCD. Furthermore, we have results pertaining to these two domains, e.g. high-x DIS on one side of the interface and the chiral domain on the other side. We will then discuss the impact of these measurements, showing in particular how they trigger theoretical advances for AdS/QCD, hadron spectroscopy and GPDs. We conclude by discussing the future spin program with the JLab upgraded 12 GeV beam.
E-mail: [email protected]
Funding source: DE-AC05-06OR23177
Neutrino Masses and Neutrino Mixing / 264
CEvNS Observation at the SNS with the COHERENT Experiment
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Author: Ivan Tolstukhin1
1 Department of Physics, Indiana University, Bloomington, IN, 47405, USA
Corresponding Author: [email protected]
The process of coherent elastic neutrino-nucleus scattering (CEvNS) predicted more than 40years ago eluded detection for a long time despite having the largest cross-section for low-energy neutrino interactions. This is largely because CEvNS detection requires sensitivity to low-energy nuclear recoils in a potentially high-background environment. The COHERENT collaboration is deploying a suite of low-energy detectors in a low-background corridor of the Spallation Neutron Source (SNS) at the Oak Ridge National Laboratory (ORNL) to test the N 2-dependence of CEνNS with different nuclear targets and detector technologies. The first observation of CEvNS at a6.7σ confidence level was recently made by the COHERENT experiment with a 14.6 kg CsI[Na] detector. The result is in agreement with the Standard Model prediction and already improves constraints on non-standard neutrino interactions. In addition, COHERENT has a 185 kg NaI[Tl] scintillating crystal array and an about 22 kg LAr detector to provide results on CEvNS from a light nucleus where nuclear form factors are close to unity. Planning is ongoing for a 10 kg PPC HPGe to be deployed in the near future. The recent observation of CEvNS at SNS, an overview of the COHERENT experiment, anda survey of the future experimental program will be presented.
E-mail: [email protected]
Collaboration name: COHERENT
Funding source: Collaborators are supported by the U. S. Department of Energy Office of Science, the National Science Foundation, NASA, and the Sloan Foundation.
QCD, Hadron Spectroscopy, and Exotics / 169
Proton Polarizabilities from a Partial-Wave Analysis of Compton Scattering Data / Sum Rules Connecting Real and Virtual Comp- ton Scattering on the Nucleon
Author: Vladimir Pascalutsa1 Co-author: Vadim Lensky 2
1 University of Mainz 2 Johannes Gutenberg University
Corresponding Author: [email protected]
Talk 169: I would like to present a first partial wave-analysis (PWA) of the experimental cross sections of Compton scattering on the proton [1]. The resulting solutions reveal an appreciable sensitivity to small refinements of the experimental database, which could explain the discrepancies amongthe various extractions of proton polarizabilities (see e.g. [3] for review). The database inconsistency can soon be resolved by the ongoing Compton experiments at the Mainz Microtron (MAMI). [1] N. Krupina, V. Lensky and V. Pascalutsa, arXiv:1712.05349 [nucl-th]. [2] O. Gryniuk, F. Hagelstein and V. Pascalutsa, Phys. Rev. D92 (2015) 074031; ibid. D94 (2016) 034043.
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[3] F. Hagelstein, R. Miskimen and V. Pascalutsa, Prog. Part. Nucl. Phys. 88 (2016) 29-97. Talk 4: The response of a nucleon to external electromagnetic probes at low energies and low momentais encoded in structure constants, the nucleon polarizabilities. In this presentation, I will discuss new relations (sum rules) that connect the structure constants measured in real, virtual, and doubly-virtual Compton scattering (CS). These relations are obtained, assuming the analyticity of the CS amplitude. Two of the new sum rules connect structure constants dependent on the nucleon spin, e.g., the longitudinal-transverse polarizability δLT , accessed in inclusive electron scattering, is related to the static spin polarizability γE1E1, measured in the real CS, and the slope of spin generalized polariz- abilities (GPs) P (M1,M1)1 − P (L1,L1)1, measured in the virtual CS. The other two sum rules hold for the unpolarized doubly-virtual CS and relate some structure constants that can only be measured in off-forward doubly-virtual CS (not experimentally accessible at present) to the slopes of thenu- 2 2 cleon’s scalar GPs and moments of the unpolarized structure functions F1(x, Q ) and F2(x, Q ). One more relation constrains the low-Q2 behaviour of the subtraction function in the CS amplitude, which enters the two-photon-exchange contribution to the Lamb shift of (muonic) hydrogen. I will discuss the verification of these sum rules, using empirical data and χPT, and the use of these relations to constrain the low-energy structure of the nucleon.
E-mail: [email protected]
Funding source: DFG (SFB 1044)
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 182
New Results on Three-Nucleon Short Range Correlations
Author: Misak Sargsian1
1 Florida International University
Corresponding Author: [email protected]
Three nucleon short range correlations are one of the most elusive structures in nuclei, whoseob- servation and the evaluation of their properties may have a significant impact on our understanding of the dynamics of super-dense nuclear matter that may exist in the cores of Neutron Stars. We discuss kinematic conditions and the observables that are most optimal for probing 3N SRCs in in- clusive electro-nuclear processes and make predictions about the inherent relation between 2N and 3N SRCs. We demonstrate that these predictions are in reasonable agreement with the limited num- ber of available high energy data, indicating on the possible first observation of 3N SRCs in the nuclei.
E-mail: [email protected]
Funding source: Department of Energy
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Neutrino Masses and Neutrino Mixing / 146
Recent MiniBooNE Results: First Measurement of Monoenergetic Muon Neutrino Charged Current Interactions and a Search for Vector Portal Dark Matter
Author: Rory Fitzpatrick1
1 University of Michigan
Corresponding Author: [email protected]
This talk will present recent results from MiniBooNE, with a focus on the first measurement ofmo- noenergetic muon neutrino charged current interactions. MiniBooNE’s sensitive search for vector portal dark matter in the mass range 0.01–0.3 GeV will also be discussed. The NuMI beamabsorber provides an intense source of 236 MeV muon neutrino events originating from kaon decay at rest that are observed by the MiniBooNE detector. The kaon-decay-at-rest (KDAR) neutrino represents a standard candle for studying neutrino-nucleus interactions, cross sections, and energy reconstruc- tion in the hundreds of MeV region and can be used for a number of precision measurements. This result is the first known-energy, weak-interaction-only probe of the nucleus to yield a measurement of neutrino-nucleus energy transfer (ω = Eν −Eµ).
E-mail: [email protected]
Collaboration name: MiniBooNE
Funding source: DOE
Parton and Gluon Distributions in Nucleons and Nuclei / 24
Hadron Multiplicity and Fragmentation in SIDIS
Author: Nicolas PIERRE1
1 CEA Saclay
Corresponding Author: [email protected]
COMPASS final results on multiplicities of charged hadrons and of identified pions and kaonspro- duced in the deep inelastic muon scattering off an isoscalar target are presented and compared to HERMES results. Measurements are done in bins of x, y and z in a wide kinematic range. The hadron and pion data show a good agreement with (N)LO QCD expectations. The most interesting is the kaon multiplicity that allows to extract kaon fragmentation functions, a crucial ingredient in solving the strange quark polarisation puzzle. The COMPASS results are quite different from the expectations of the old NLO DSS fit and they cannot be described by LO QCD either. In this context the importance of K+/K− multiplicity ratio at high z is discussed.
E-mail: [email protected]
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Quark Matter and High Energy Heavy Ion Collisions / 122
Current Status of Hydrodynamic Modeling from p+p to Heavy Ions
Author: Ryan Weller1
1 MIT
Corresponding Author: [email protected]
In recent years, suggestive signatures of collective flow-like behavior have been observed in p+p collisions at the LHC and also in light+heavy-ion collisions. We review hydrodynamic model cal- culations that reasonably describe the experimentally measured dNch/dη and v2, v3, v4 at η = 0 in collisions from Pb+Pb down to p+p. Nevertheless, it is still uncertain whether the flow-like corre- lations in small collisions should be ascribed the same hydrodynamic origin as in heavy+heavy-ion collisions. Resolving this problem requires knowing (1) how a proton should impart its fluctuating shape on hydrodynamic initial data (e.g. ε2, ε3), and (2) in what situations hydrodynamics is justi- fied. It turns out the entire non-hydrodynamic behavior of a system is encoded at large orders inthe hydrodynamic gradient expansion, whose resummation yields a subset of microscopic system trajec- tories known as a hydrodynamic attractor. The behavior of trajectories near this attractor definean “off-equilibrium” version of hydrodynamics, whose applicability for small collisions is justified. This provides an answer to (2), but leaves (1), the choice of hydro initial data, as an open issue.
E-mail: [email protected]
Funding source: U.S. Department of Energy, under grant Contract Number DE-SC0011090
Physics at High Energies / 309
Probing Hidden Sectors at the LHC
Author: Brian Shuve1
1 Harvey Mudd College
Corresponding Author: [email protected]
I discuss examples of how the LHC can be sensitive to low-mass hidden sectors. In particular, I show how rare Z-boson decays provide a window into the mass-generation mechanism of dark-photon models, motivating searches for displaced vertices and high multiplicities of soft leptons.
E-mail: [email protected]
Dark Matter / 300 keV Sterile Neutrinos as Dark Matter and the 3.5 keV Line
Author: Kev Abazajian1
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1 UC Irvine
Corresponding Author: [email protected]
I will give an overview of the status of keV sterile neutrinos as dark matter, including the production mechanisms in the early universe and detectability today. I will give the status of indirect searches, including the candidate X-ray line at 3.55 keV and prospects for future searches. I will also discuss laboratory detection methods, including searches in beta decay and K-capture nuclei.
E-mail: [email protected]
Funding source: NSF Theoretical Physics Grant No. PHY-1620638
Neutrino Masses and Neutrino Mixing / 299
Overview of DUNE
Author: Jianming Bian1
1 UC Irvine
Corresponding Author: [email protected]
The Deep Underground Neutrino Experiment (DUNE) is a next-generation long-baseline experiment. DUNE will utilize a high-intensity neutrino beam produced at Fermilab and will measure electron- neutrino appearance and muon-neutrino disappearance with its 40 kiloton Liquid Argon far detector at the Sanford Underground Research Facility (SURF) in Lead, South Dakota, 1300 km from Fermi- lab. The goals of DUNE are studies of neutrino oscillations, including CP violation and neutrino mass hierarchy determination, and searches for nucleon decays and supernova neutrinos, as well as precision neutrino physics at the near site. The DUNE far detectors are based on liquid argon time projection chamber (LArTPC) technology, which offers an excellent spatial resolution, high neutrino detection efficiency, and superbback- ground rejection. Two large DUNE far detector prototypes, in both single phase LArTPC (ProtoDUNE- SP) and dual phase LArTPC (ProtoDUNE-DP) technologies, are under construction and will be op- erated at the CERN Neutrino Platform (NP) starting in late 2018. In this talk, we will give an overview of the physics program and current status of the DUNE exper- iment.
E-mail: [email protected]
Collaboration name: DUNE
Particle and Nuclear Astrophysics / 133
Latest Results from the AMS Experiment on the International Space Station
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Author: francesca giovacchini1
1 ciemat
Corresponding Author: [email protected]
The Alpha Magnetic Spectrometer (AMS) is a multi-purpose high-energy particle physics detector in space. It was installed on the International Space Station (ISS) in May 2011 to conduct a unique long- duration mission of fundamental physics research in space. In seven years AMS has collected more than 115 billion charged cosmic rays with energies up to TeV region performing the most precise measurement of galactic cosmic rays to date. An overview of the latest results from AMS will be presented.
E-mail: [email protected]
Collaboration name: AMS-02 Collaboration
Dark Matter / 332
Searching for Ultra-Heavy Dark Matter
Author: Surjeet Rajendran1
1 UC Berkeley
Corresponding Author: [email protected]
Observational bounds on the mass of dark matter could allow the dark matter to be as heavyas 1048 GeV. Such ultra-heavy dark matter candidates emerge as composite objects produced as are- sult of significant self-interactions in the dark sector. Detection of this kind of dark matter raises new challenges — the low number density of these particles requires detectors with a large target volume, while the transit of an individual ultra-heavy dark matter particle can lead to significant en- ergy deposition. Leveraging the fact that the transit speed of dark matter is ∼220 km/s, well below relativistic speeds but above terrestrial speeds, we discuss methods to search for ultra-heavy dark matter.
E-mail: [email protected]
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 186
The Nucleon Axial Coupling from Quantum Chromodynamics
Author: Chia Cheng Chang1
1 LBL
Corresponding Author: [email protected]
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The axial coupling of the nucleon, gA, is the strength of its coupling to the weak axial current of the Standard Model, much as the electric charge is the strength of the coupling to the electromagnetic current. This axial coupling dictates, for example, the rateof β-decay of neutrons to protons and the strength of the attractive long-range force between nucleons. Precision tests of the Standard Model in nuclear environments require a quantitative understanding of nuclear physics rooted in Quantum Chromodynamics, a pillar of this theory. The prominence of gA makes it a benchmark quantity to determine theoretically, a difficult task as the theory is non-perturbative. Lattice QCD provides a rigorous, non-perturbative definition of the theory which can be numerically implemented. In order to determine gA, the lattice QCD community has identified two challenges which mustbe overcome to achieve a 2% precision by 2020: the excited state contamination must be controlled QCD and the statistical precision must be markedly improved. Here we report a calculation of gA = 1.271 ± 0.013 using an unconventional method that overcomes these challenges.
E-mail: [email protected]
Collaboration name: CalLat
Funding source: DOE
Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity / 329
Recent Results from the Dark Energy Survey
Author: Eric Baxter1
1 University of Pennsylvania
Corresponding Author: [email protected]
The Dark Energy Survey has recently demonstrated powerful cosmological constraints obtained us- ing first year observations of galaxy positions and gravitational lensing of galaxy images. Inthenear future, these analyses will be extended to include cross-correlations with gravitational lensing of the cosmic microwave background, and constraints from other cosmological probes. I will summarize recent results and discuss near-term improvements.
E-mail: [email protected]
Collaboration name: Dark Energy Survey Collaboration
PPHI / TSEI / 267
Precision Atomic Tests of Physics Beyond the Standard Model
Author: Holger MuellerNone
Corresponding Author: [email protected]
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We will give an overview of atomic precision measurements as tests of physics beyond the Standard Model, such as searches for “fifth forces”, tests of fundamental symmetries with clocks, and searches for an electric dipole moment of the electron. In particular, measurements of the fine structure constant α use methods from across sub-fields and are thus powerful tests of the consistency of theory and experiment in physics. Using the recoil frequency of cesium-133 atoms in a matter-wave interferometer, we report the most accurate measurement, α = 1/137.035999046(27), at 2.0×10−10 accuracy. Comparison with Penning-trap measurements of the electron gyromagnetic anomaly g−2 via the Standard Model is now limited by the uncertainty in g−2; a 2.5-sigma tension has implications for dark sector candidates and electron substructure may be a sign of physics beyond the Standard Model that warrants further investigation.
E-mail: [email protected]
Quark Matter and High Energy Heavy Ion Collisions / 54
Overview of Recent Results from the ATLAS Experiment
Author: Brian Cole1
1 Columbia University
Corresponding Author: [email protected]
The heavy-ion program in the ATLAS experiment at the LHC originated as an extensive program to probe and characterize the hot, dense matter created in relativistic lead-lead collisions. In recent years, the program has also broadened to a detailed study of collective behaviour in smaller sys- tems. In particular, the techniques used to study larger systems are also applied to proton-proton and proton-lead collisions over a wide range of particle multiplicities, to try and understand the early-time dynamics which lead to similar flow-like features in all of the systems. Another recent development is a program studying ultra-peripheral collisions, which provide gamma-gamma and photonuclear processes over a wide range of CM energy, to probe the nuclear wavefunction. This talk presents the most recent results from the ATLAS experiment based on Run 1 and Run 2 data, including measurements of collectivity over a wide range of collision systems, potential nPDF modifications – using electroweak bosons, inclusive jets, and quarkonia – and photonuclear dijet production.
E-mail: [email protected]
Collaboration name: ATLAS Collaboration
Dark Matter / 324
Darkside Status and Prospects
Author: Luca Pagani1
1 UC Davis
Corresponding Author: [email protected]
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DarkSide uses dual-phase Liquid Argon Time Projection Chambers to search for WIMP dark matter. The talk will present the latest result from the current experiment, DarkSide-50, running sincemid 2015 using a 50-kg-active-mass TPC, filled with argon from an underground source. The next stage of the DarkSide program will be a new generation experiment involving a global collaboration from all the current Argon based experiments. DarkSide-20k, based on a 20-tonne fiducial mass TPC with SiPM based photosensors, is designed to have a background well below that from coherent scattering of solar and atmospheric neutrinos. Like its predecessor, DarkSide-20k will be housed at the Gran Sasso (LNGS) underground laboratory, and it is expected to attain a WIMP-nucleon cross section of 10−47 cm2 for a WIMP mass of 1 TeV/c2 in a 5 year run.
E-mail: [email protected]
Collaboration name: DarkSide
PPHI / TSEI / 277
Muon g-2 Experiments at FNAL and J-PARC
Author: Joseph Price1
1 University of Liverpool
Corresponding Author: [email protected]
The measurement of the anomalous magnetic moment of the muon made at Brookhaven National Laboratory differs from the Standard Model expectation by over 3 standard deviations. A newexper- iment at Fermilab, using the same storage ring as the Brookhaven experiment, aims to improve the accuracy of this measurement by a factor of 4, and an additional experiment, using a new technique, at J-PARC is scheduled. The results from these experiments are among the most eagerly anticipated in particle physics. The Fermilab g-2 experiment began data taking this year, and a summary ofthe early measurements will be presented, together with the status, timeline and expected sensitivity of the two experiments.
E-mail: [email protected]
Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity / 19
The eBOSS Survey: Recent Results and Prospects
Author: Anand Raichoor1
1 EPFL
Corresponding Author: [email protected]
I will present recent results and prospects for the SDSS/eBOSS survey (2014-2019), the last program completing the SDSS cosmological observations, which started some twenty years ago. The primary goal of those observations is to constrain dark energy through the measure of the distance-redshift relation with baryon acoustic oscillations (BAO) in the clustering of matter. eBOSS will use one mil- lion objects divided in four different tracers to expand the volume covered by SDSS/BOSS focusing on
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the redshift range [0.6,2.2]. The eBOSS data will also bring constraints on other cosmological topics, as test of General Relativity on cosmological scales through redshift-space distortion measurements, or new constraints on the summed mass of all neutrino species.
E-mail: [email protected]
Collaboration name: SDSS/eBOSS Collaboration
Quark Matter and High Energy Heavy Ion Collisions / 363
Overview of Recent Heavy Ion Results from the CMS Experiment
Author: Manuel Calderon de la Barca Sanchez1
1 UC Davis
Corresponding Author: [email protected]
We present a summary of recent heavy ion results with CMS, including several topics of interest to the study of quark matter. Our interest involves characterizing the properties of the quark-gluon plasma, such as its temperature and transport coefficients, and the dynamical properties leading to collective behavior. We have explored the onset of collectivity in small systems via azimuthal correlations in p-Pb collisions. We discuss energy loss of high momentum partons via measurements of photon-tagged jets, jet shapes, heavy-flavor jets, and reconstruction of heavy-flavor hadrons. We present results on hot and cold nuclear effects on charmonia and bottomonia via measurements in p-Pb and Pb-Pb. In addition, measurements obtained during the 1-day Xe-Xe test run at the LHC, comparing them to the Pb-Pb case, will also be presented. We discuss measurements of W bosons and top quark production in p-Pb collisions, which can constrain nuclear PDFs.
E-mail: [email protected]
Collaboration name: CMS
Funding source: NSF
Particle and Nuclear Astrophysics / 360
New Results and Update on Ultrahigh Energy Cosmic Rays
Author: Glennys Farrar1
1 NYU
Corresponding Author: [email protected]
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This talk will have two components. The main part will survey the state-of-knowledge aboutUHE- CRs, emphasizing recent results from the Pierre Auger Observatory on anisotropies and possible source correlations. A short second part will report on multi-messenger constraints combining Auger, Fermi-LAT and IceCube data, on pure-proton and mixed-composition source models.
E-mail: [email protected]
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 263
The Nucleon Axial Form Factor from Quantum Chromodynam- ics
Author: Rajan Gupta1
1 Los Alamos National Lab
Corresponding Author: [email protected]
The nucleon axial form factor is needed to calculate the cross-section of neutrino interactions with nuclei. Due to lack of data on neutrino scattering off protons, one has to model the effect ofnuclear interactions to extract it from neutrino scattering data off heavier nuclei. It is also being calculated from first principles analysis of QCD using large scale simulations of lattice QCD. By comparing the phenomenological and lattice QCD form factors, one can help constrain the modeling ofnuclear effects. This talk will summarize the status of lattice QCD calculations and discuss thechallenges and prospects for high precision results.
E-mail: [email protected]
Collaboration name: PNDME
Funding source: DOE HEP and LANL LDRD
Neutrino Masses and Neutrino Mixing / 268
Measurements of Neutrino-Nucleus Scattering from 0.1–10 GeV
Author: Christopher MarshallNone
Corresponding Author: [email protected]
Neutrino interactions and nuclear modeling are among the largest systematic uncertainties in neu- trino oscillation experiments, which must infer the true neutrino energy from scattering products on heavy targets such as carbon, oxygen, or argon. Recent data from MiniBooNE, T2K, and MIN- ERvA indicate shortcomings in current theoretical models of neutrino cross sections on nuclei. I will present an overview of measurements of neutrino scattering in the range of 0.1 to 10 GeV, and discuss prospects for the future.
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E-mail: [email protected]
Dark Matter / 239
Results and Plans for the PICO Dark Matter Bubble Chamber
Author: Anthony Noble1
1 Queens University
Corresponding Author: potato@snolab.ca
This talk will present the current status of the PICO dark matter experimental program. ThePICO detectors are based on the bubble chamber technology and record potential interactions of WIMPs in the target fluid through phase transitions induced by the energy depositions of recoiling nuclei. The technique is complementary to other dark matter search methods and has lead to recentworld- leading results for spin-dependent WIMP interactions. The current state of the results from PICO operations will be presented, as well as an update on the status and prognosis for the new detector configuration PICO-40, currently being installed at SNOLAB. The future prospects for a tonnescale “PICO-500” will also be described.
E-mail: [email protected]
Collaboration name: PICO Collaboration
Dark Matter / 101
The Latest Analyses of the LUX Dark Matter Project
Author: Matthew Szydagis1
1 U Albany
More recent results will be shared from the Large Underground Xenon (LUX) detector, which was a 100-kg-scale, 2-phase xenon direct dark matter search experiment, operated between 2013–16 at SURF. Dark matter, the missing 25% of the mass-energy content of the universe, is sought inmore ways, using effective field theory operators to extend the search to higher-mass Weakly Interacting Massive Particles (WIMPs), and electron instead of nuclear recoil, to seek axions and mirror dark matter. In addition, annual and diurnal modulation analyses of the 427 live-days of exposurewill be explored. Lastly, old and new calibrations (including 14C β, 127Xe, 83mKr, and D-D neutron) and position, energy, field, and pulse-shape reconstruction techniques plus trigger efficiency willbe reviewed, in the context of new background and signal models being developed by LUX which will extend to higher energies than ever before.
E-mail: [email protected]
Collaboration name:
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LUX (Large Underground Xenon)
Funding source: Department of Energy
PPHI / TSEI / 149
New Results on Low-Energy Exclusive Hadronic Cross Sections from BaBar and Implications for g-2 of the Muon
Author: Bill GARY1
1 University of California, Riverside
Corresponding Author: [email protected]
The BABAR Collaboration has an extensive program studying hadronic cross sections in low-energy e+e− collisions, accessible through the selection of events with initial-state photon radiation. The measurements allow significant improvements in the precision of the standard model prediction for the muon anomalous magnetic moment. Recent results on the π+π−π0π0 final state and on KKππ final states are presented. The ππππ channel is one of the most important for the muon g-2 calculation, while our measurements of the KKππ channels obviate the need to rely on isospin relations and greatly improve the results in these channels.
E-mail: [email protected]
Collaboration name: BaBar
Particle and Nuclear Astrophysics / 85
Recent Highlights from the High Altitude Water Cherenkov Ob- servatory
Author: Andrea Albert1
1 SLAC
Corresponding Author: [email protected]
The High Altitude Water Cherenkov (HAWC) Observatory has been surveying the TeV sky forover 3 years. HAWC surveys 2/3rd of the sky each day with a wide field-of-view, high duty-cycle, and wide energy range. HAWC is a powerful instrument to study key aspects of particle astrophysics, including the production, propagation, and interaction of cosmic rays, searches for dark matter, and locating the highest energy (>100 TeV) gamma-ray sources. It can also monitor for variable sources and transients. We will discuss the discovery of TeV halos around middle-aged nearby pulsars that shed new light on the positron excess puzzle. We will also discuss new TeV sources that have been discovered, including possible PeV cosmic ray sources (PeVatrons). Additionally, we will discuss searches for GRBs, gravitational wave events, and dark matter.
E-mail:
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Collaboration name: HAWC Collaboration
Funding source: DOE Office of Science HEP
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 121
Neutrinoless Double Beta Decay in Chiral Effective Field Theory
Author: Vincenzo Cirigliano1
1 Los Alamos National Laboratory
Corresponding Author: [email protected]
Within the framework of chiral effective field theory I will discuss the leading contributions tothe neutrinoless double-beta decay transition operator induced by light Majorana neutrinos. Based on renormalization arguments, I will argue that one needs to introduce a leading-order short-range operator, missing in all current calculations. I will then discuss strategies to determine the finite part of the short-range coupling by matching to lattice QCD or by relating it via chiral symmetry to isospin-breaking observables in the two-nucleon sector. Finally, I will estimate the impact of this new contribution on nuclear matrix elements of relevance to experiment.
E-mail: [email protected]
Neutrino Masses and Neutrino Mixing / 319
The CAPTAIN Program: Status and Plans
Author: Christopher Mauger1
1 University of Pennsylvania
Corresponding Author: [email protected]
The Cryogenic Apparatus for Precision Tests of Argon Interactions with Neutrinos (CAPTAIN) pro- gram makes measurements that are crucial for the future DUNE experiment. DUNE aims to study neutrino oscillation phenomena with high precision with long-baseline and atmospheric neutrinos, and the electron-neutrino spectrum from galactic core-collapse supernovae. CAPTAIN addresses challenges with both of these programs by making measurements of the liquid-argon time-projection chamber (LArTPC) response to medium-energy neutrons and by measuring the electron-neutrino on argon cross-section in an energy regime coincident with the neutrino spectrum expected from super- novae. CAPTAIN has deployed Mini-CAPTAIN, a 400-kg instrumented-mass LArTPC, in a neutron beamline at the Los Alamos Neutron Science Center that provides neutrons of energies up to 800 MeV. I report the status of the analysis of these measurements and their implications for DUNE’s long-baseline neutrino oscillation program. Next, the 5-ton instrumented-mass CAPTAIN detector will be deployed in a stopped-pion neutrino source. This will constitute the first demonstration that LArTPC’s can measure neutrinos in an energy regime relevant to supernova physics.
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E-mail: [email protected]
Collaboration name: CAPTAIN
Quark Matter and High Energy Heavy Ion Collisions / 250
ALICE Upgrades for Run3 and Physics Projections
Author: Wladyslaw Henryk Trzaska1
1 University of Jyvaskyla
Corresponding Author: [email protected]
The upcoming upgrade of the CERN LHC is a challenge and opportunity for ALICE (ALargeIon Collider Experiment). By sustaining a Pb–Pb readout rate of 50 kHz, ALICE will gain two orders of magnitude in statistics and conduct high-precision measurements of rare probes at low pT values. ALICE is refitting the Time Projection Chamber with new, GEM-based readout chambers withelec- tronics for continuous readout using the new SAMPA chip. The same chip will be utilized forthe upgrade of electronics of the Muon Arm. To improve vertexing and tracking, especially at low pT values, a new Inner Tracking System is being constructed based on ALIPIDE (ALICE Pixel Detector) — a custom designed sensor incorporating the specific requirements imposed by the physics pro- gram, including a high-granularity and low material budget of the non-active elements. ALIPIDE is also used by the Muon Forward Tracker intended to add vertexing capabilities to the Muon Spec- trometer over a broad range of transverse momenta allowing ALICE to measure beauty down to pT ∼ 0 from displaced J/ψ vertices and to have an improved precision for the ψ(2S) measurement. It will also add high-granularity data to the forward multiplicity information acquired by the new Fast Interaction Trigger. The TOF and TRD will get new readout electronics while PHOS, EMCAL, CPV, and HMPID will improve the readout rates with the existing electronics. The O2 system will offer new computing facility with online tracking and data compression.
E-mail: [email protected]
Collaboration name: ALICE Collaboration
Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity / 266
Cosmology with the Atacama Cosmology Telescope
Author: Simone Aiola1
1 Princeton University
Corresponding Author: [email protected]
Full-sky Cosmic Microwave Background (CMB) temperature data from the Planck satellite tightly constrains the six ΛCDM parameters, reinforcing the success of the current model in describing
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the CMB sky. However, more precise cosmological measurements show tensions between the high- redshift and low-redshift probes, with a discrepancy in the value of the Hubble constant, H0, at a significance higher than 3σ. Although these results could suggest a failure of the present model, the accuracy of the current measurements has been questioned. The Atacama Cosmology Telescope (ACT) is currently mapping forty percent of the CMB skyathigh resolution. In this talk, I will show how such a unique dataset will allow us to investigate the current tensions. I will highlight the complementarity of a high-resolution experiment also capable to extract high- fidelity information from the polarization of the CMB. I will conclude with future prospects forthe next generation CMB experiments.
E-mail: [email protected]
Collaboration name: ACT Collaboration
Dark Matter / 271
LUX Sensitivity to Effective Field Theory Interactions
Author: Nicole Larsen1
1 University of Chicago / Kavli Institute for Cosmological Physics
Corresponding Author: [email protected]
The past two decades have seen a tremendous increase in the sensitivity of direct detection exper- iments. In the absence of a definitive dark matter detection, the Large Underground Xenon (LUX) campaign (which ran underground at the Sanford Underground Research Facility from 2013 to 2016) has worked to constrain a far broader set of dark matter interactions than the spin-independent and spin-dependent results that are typically reported. Here we review a non-relativistic effective field theory framework that describes a rich set of momentum-and-velocity dependent dark matter- nucleon interactions in a model-independent way. We comment on complementarity between ex- perimental targets and techniques. Finally, we discuss LUX’s sensitivity to this class of interactions both in isolation and in the case of interference between interactions.
E-mail: [email protected]
Collaboration name: LUX Collaboration
Particle and Nuclear Astrophysics / 87
IceCube/DeepCore Results on Neutrino Properties Using Atmo- spheric Neutrinos
Author: Feifei Huang1
1 The Pennsylvania State University
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Corresponding Author: [email protected]
The IceCube Neutrino Observatory at the South Pole can measure atmospheric neutrinos atener- gies up to the TeV scale. DeepCore is the low-energy subarray that provides sensitivity in the neutrino energy range from roughly 10 GeV to 100 GeV, where Earth-crossing neutrinos are sub- ject to flavor-oscillation phenomena. These neutrinos are muon and electron neutrinos produced in Earth’s atmosphere via decays of particles from interactions between cosmic rays and the atmo- sphere. The primary oscillations detected are from muon neutrinos to tau neutrinos. Wepresent the measurement of muon neutrino disappearance and tau neutrino appearance using three years of IceCube-DeepCore data.
E-mail: [email protected]
Collaboration name: IceCube
Neutrino Masses and Neutrino Mixing / 201
Neutrino Scattering Studies in MicroBooNE
Author: Vassili Papavassiliou1
1 New Mexico State University
Corresponding Author: [email protected]
A good understanding of the cross sections for neutrino interactions with nucleons and nuclei is crucial for neutrino oscillation studies, in addition to providing a tool for the exploration of nucleon and nuclear structures. The MicroBooNE liquid-argon time-projection-chamber (LArTPC) experi- ment has been taking neutrino data with the Booster Neutrino Beam at Fermilab since 2015. The LArTPC capabilities in track reconstruction, energy measurement, and particle identification allow us to probe interesting regions of neutrino-argon scattering cross sections and to probe the quark composition of the nucleon and test models of nuclear structure and final-state interactions. We present the current status of several on-going MicroBooNE cross section analyses, as well as plans for future measurements.
E-mail: [email protected]
Collaboration name: MicroBooNE
Funding source: DOE
Quark Matter and High Energy Heavy Ion Collisions / 314
Parton Shower Modification Studied with Jet Substructure in AL- ICE
Author: Davide Caffarri1
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1 NIKHEF - Amsterdam
Corresponding Author: [email protected]
The heavy-ion physics program at the LHC aims at characterizing the high energy density,high temperature, deconfined partonic state of matter called Quark-Gluon Plasma. Hard probes arevery useful tools to study the QGP properties since they are abundantly produced at the LHC energy regime, via hard scattering processes, and they experience the full evolution of the system, losing energy while passing through it. Eventually, these processes might also modify the parton fragmen- tation with respect to the vacuum case. Jet measurements in Pb–Pb collisions allow one to study how the energy is lost by the partons that traverse the medium and redistribute it to other particles present in the QGP. Moreover, measure- ments of the jet substructure can bring insight on possible modifications, induced by the medium, on fragmentation of partons into jets and their virtuality evolution. Jet substructure is probed using jet shape observables, defined as different combinations of information that jets carry at different levels (energy profile, jet constituents distributions, clustering history, …). The measurement of these observables in pp collisions is also an important test of QCD, to be compared with theoretical calculations and Monte Carlo generators. A review of recent jet shape measurements performed with the ALICE detector in pp and Pb-Pb collisions will be presented.
E-mail: [email protected]
Collaboration name: ALICE
PPHI / TSEI / 61
Baryogenesis via Particle–Antiparticle Oscillations
Author: Seyda Ipek1
Co-author: John March-Russell 2
1 University of California Irvine 2 University of Oxford
Corresponding Author: [email protected]
Our Universe has more matter than antimatter and we cannot explain this asymmetry within the Standard Model. CP violation is crucial to explain the baryon asymmetry of the Universe. We observe CP violation in the SM in neutral meson oscillations. Can similar (but beyond the SM) particle–antiparticle oscillations in the early Universe generate the baryon asymmetry? I will show “Yes, they can!” and give a specific new physics model as an example.
E-mail: [email protected]
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 114
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Current Status of Neutrinoless Double-Beta Decay Matrix Elements
Author: Javier Menendez1
1 Center for Nuclear Study, University of Tokyo
Corresponding Author: [email protected]
Observing neutrinoless double-beta (0νββ) decay is the most promising way to detect lepton number violation in the laboratory, and it would imply that neutrinos are their own antiparticles. The decay half-life naturally depends on a nuclear matrix element that needs to be calculated theoretically. A good knowledge of this matrix element is key for the planning of 0νββ decay experiments, and also to extract information on the neutrino mass once 0νββ decay is observed. Currently predicted matrix-element values depend on the many-body method used to calculate them and, in addition, they may need to be “quenched”, as the matrix elements of other beta decays that, however, have a very different momemtum-transfer regime. I will discuss recent efforts towards obtaining reliable nuclear matrix elements, ranging from improved calculations with phenomeno- logical many-body approaches, to the first applications of “ab initio” many-body methods to 0νββ decay, finalizing with possible measurements that could be very useful to test calculations andto provide information on the value of the 0νββ matrix elements.
E-mail: [email protected]
Funding source: Japanese Society for the Promotion of Science through KAKENHI grant No. 18K0639
Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity / 211
BICEP/Keck: Constraining the Primordial Gravitational-Wave Sig- nal with CMB Polarization Observations from the South Pole
Author: Lorenzo Moncelsi1
1 California Institute of Technology
Corresponding Author: [email protected]
The inflationary scenario generically predicts the existence of primordial gravitational waves(GW), though over a wide range of amplitudes from slow-roll to multi-field models. Currently the most promising method for constraining, and potentially detecting, an inflationary GW background is to search for the imprint that these tensor perturbations would leave on the cosmic microwave back- ground (CMB) polarization as a parity-odd “B-mode” pattern. The BICEP/Keck experiments (BK) target this primordial signature by observing the polarized microwave sky at degree-scale resolu- tion from the South Pole. Attempting to observe the very faint primordial B-mode signal requires a telescope with exquisite sensitivity and tight control of systematics. The presence of bright Galactic emission, along with the distortion of the CMB polarization field due to gravitational lensing, make this measurement extremely challenging. In order to disentangle the primordial signal from these “foregrounds”, a wide frequency coverage is necessary. I will present the latest BK constraints on the tensor-to-scalar ratio “r” using data taken from 2010 to 2015 at 90, 150, 220 GHz (BK15), in com- bination with data from the Planck and WMAP satellites. Upcoming observations with the “Stage-3” BICEP Array experiment will extend this frequency range to 30–270 GHz, ultimately improving our sensitivity to r by an order of magnitude with respect to BK15, thus constraining natural inflation and all single-field models.
E-mail:
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Collaboration name: BICEP and Keck Array Collaborations
Funding source: Keck Foundation, Moore Foundation, National Science Foundation
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 76
Overview of Nuclear Beta Decay Tests of Fundamental Symme- tries
Author: Alejandro Garcia1
1 University of Washington
Corresponding Author: [email protected]
We will present an overview on the present status and outlook of experiments using nuclear beta decays to search for new physics. At the low-momentum transfers associated with nuclear beta decays, phenomena associated with new physics at high-energy scales can show up as right-handed or chirality-flipping (tensor or scalar) currents, all absent in the Standard Model. We will describe ongoing experimental efforts, future per- spectives in the field, and the needs from nuclear structure theory to carry out the program.
E-mail: [email protected]
Funding source: DOE
PPHI / TSEI / 203
Search for Neutron-Antineutron Oscillations at the Sudbury Neu- trino Observatory
Author: Marc Bergevin1
1 LLNL
Corresponding Author: [email protected]
Tests on |B − L| symmetry breaking models are important probes to search for new physics. One proposed model with |∆(B − L) = 2| involves the oscillation of a neutron to an antineutron. In this talk, the recently published results for a search of this process in the deuteron from the data acquired from all three operational phases of the Sudbury Neutrino Observatory experiment will be summarized. Discussions on the observable signature of such a process and an upper limit on the free neutron-antineutron oscillation time will also be provided.
E-mail:
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Collaboration name: SNO Collaboration
Funding source: Part of this work was performed under the auspices of the US Department of Energy by Lawrence Liv- ermore National Laboratory under contract DE-AC52-07NA27344, release number LLNL- ABS-749889.
Dark Matter / 202
Position Reconstruction Using Photon Timing for the DEAP-3600 Liquid Argon Dark Matter Experiment
Author: Yu Chen1
1 University of Alberta
Corresponding Author: [email protected]
DEAP-3600 is a single-phase liquid argon (LAr) dark matter detector being operated 2 km under- ground at SNOLAB. The ultra-pure LAr target is contained in a spherical acrylic vessel of3600kg capacity, viewed by an array of 255 photomultiplier tubes (PMTs). The expected sensitivity to the spin-independent WIMP-nucleon cross-section is 10−46 cm2 at 100 GeV WIMP mass. Natural ra- dioactive contamination can cause alpha decays originating in the acrylic vessel or TPB wavelength shifter, or gamma rays, mostly from PMT materials, that may induce Cerenkov light. Thesearepo- tential surface backgrounds. Reconstruction of the position of the interactions taking place in the detector utilizes both charge and timing. Including this information in our suite of cuts allows us to identify and remove almost all surface background events. An overview and the results of the initial filling phase is presented. A method of event position reconstruction emphasizing photon timing will be discussed.
E-mail: [email protected]
Collaboration name: DEAP-3600
Particle and Nuclear Astrophysics / 65
Recent Status and Future Plans for the China JinPing Underground Laboratory
Author: Qian Yue1
1 Tsinghua University
Corresponding Author: [email protected]
China Jinping Underground Laboratory (CJPL) is the deepest laboratory and an ideal site for rare- event experiments such as dark matter, neutrinoless double beta decay, solar neutrino experiment,
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and so on. It is located in the Jinping Mountain, Sichuan Province, southwest China, with an over- burden of about 2,400 m. The laboratory is operated by Tsinghua University and Yalong River Hy- dropower Development Company, Ltd. This paper will give an overview of conditions, status and future plans of the laboratory. Main experiments and scientific activities carried out at CJPL will also be presented. The experimental programs for direct detection of dark matter at CJPL willalso be introduced.
E-mail: [email protected]
Quark Matter and High Energy Heavy Ion Collisions / 289 b-Jet Tagging Performance with ALICE
Author: Barbara Trzeciak1
1 Utrecht Univeristy
Corresponding Author: [email protected]
The ALICE experiment is dedicated to investigate properties of the Quark-Gluon Plasma (QGP)cre- ated in high-energy Pb–Pb collisions at the LHC. Heavy quarks (charm and beauty) are a unique tool to study and characterise the QGP properties. They are produced in the early stage of the heavy-ion collisions and traverse the hot and dense medium losing energy due to collisional and radiative pro- cesses that are predicted to be dependent on the colour charge and mass of the hard-scattered parton. Measurement of the beauty-jet (b-jet) production gives a direct access to the initial parton kinemat- ics. It can provide further constraints for heavy-quark energy loss models and allows accessing a possible modification of the b-quark fragmentation in the medium. Studies of b-jets in pp and p–Pb collisions are the necessary reference for interpreting the heavy-ion collision results. In this talk, we will present performance studies for the b-jet tagging in pp and p–Pb collisions with the ALICE detector. The b-jet identification exploits the long lifetime and the relatively large mass of the B hadrons. We will discuss b-jet tagging algorithms based on single tracks and on the displaced secondary vertex topology, including a very promising deep learning based b-jet tagging approach.
E-mail: [email protected]
Collaboration name: ALICE
Neutrino Masses and Neutrino Mixing / 284
Hadron Production Measurements for Long-Baseline Neutrino Experiments with NA61/SHINE
Author: Yoshikazu Nagai1
1 University of Colorado Boulder
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Corresponding Author: [email protected]
A precise prediction of the neutrino flux is a key ingredient for achieving the physics goals oflong- baseline neutrino experiments. In modern accelerator-based neutrino experiments, neutrino beams are created from the decays of secondary hadrons produced in hadron-nucleus interactions. Hadron production is the leading systematic uncertainty source on the neutrino flux prediction; therefore, its precise measurement is essential. The NA61/SPS Heavy Ion and Neutrino Experiment (NA61/SHINE) is a fixed-target experiment atthe CERN Super Proton Synchrotron, which studies hadron production in hadron-nucleus and nucleus- nucleus collisions for various physics goals. For neutrino physics, light hadron beams (protons, pions, and kaons) are collided with a light nuclear target (carbon, aluminum, and beryllium) and spectra of outgoing hadrons are measured. This talk will review the recent results and ongoing hadron production measurements in NA61/SHINE for the precise neutrino flux predictions in the T2K and Fermilab long-baseline neutrino experiments. For the T2K experiment, the interactions of 31 GeV/c proton beams on a thin carbon or a replica of the T2K 90 cm-long carbon target were measured and these measurements have significantly re- duced T2K’s neutrino flux uncertainty. For the Fermilab long-baseline neutrino beamlines (NuMI and LBNF), measurements are currently ongoing for 60–120 GeV proton, pion, and kaon beams on various nuclear targets. This talk will also discuss the prospects for future hadron production mea- surements with NA61/SHINE beyond 2020, after the Long Shutdown 2 of the accelerator complex at CERN.
E-mail: [email protected]
Collaboration name: NA61/SHINE Collaboration
Neutrino Masses and Neutrino Mixing / 136
Isolating Neutrino Cross Section Uncertainties with Theory
Author: Aaron Meyer1 Co-authors: Andreas Kronfeld 2; Ciaran Hughes 2; Minerba Betancourt 2; Richard Gran 3; Richard Hill 4; Yin Lin 5
1 Brookhaven National Laboratory 2 Fermilab 3 University of Minnesota 4 University of Kentucky 5 University of Chicago
Corresponding Author: [email protected]
Studies of neutrino oscillation physics lay at the intersection point of nucleon physics, nuclear physics, and experimental physics. Computations of the neutrino scattering cross sections that are necessary to understand oscillation physics require nuclear models with weak matrix elements of the nucleon. These matrix elements are difficult to probe experimentally or can be subject tosub- stantial systematic corrections, and common model parametrizations significantly underestimate the uncertainties of the pertinent nucleon amplitudes. Furthermore, these amplitudes are often de- termined from scattering of neutrinos with nuclei, which entangles the uncertainties from nucleon amplitudes and nuclear model assumptions. In this talk, I will highlight recent work to dissect and understand the uncertainties from neutrino scattering with free nucleons, with the intention ofpro- viding realistic estimates of the nucleon amplitude uncertainties. These studies include use of the model-independent z-expansion parametrization to reanalyze deuterium bubble chamber data as
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well as preliminary first-principles calculations from lattice QCD. With robust estimates of theun- certainty, it will then be possible to unambiguously isolate the discrepancies with experimental data that come from nucleon amplitudes and nuclear models.
E-mail: [email protected]
Particle and Nuclear Astrophysics / 326
NuSTAR and Super-Eddington Accretion onto Neutron Stars
Author: Murray Brightman1 Co-authors: Andrew Fabian 2; Daniel Stern 3; Didier Barret 4; Dominic Walton 2; Felix Fuerst 5; Fiona Harrison 1; Matteo Bachetti 6; Matthew Middleton 7
1 Caltech 2 University of Cambridge 3 JPL 4 IRAP 5 ESAC 6 INAF 7 University of Southampton
Corresponding Author: [email protected]
The Nuclear Spectroscopic Telescope Array (NuSTAR) is the first focusing X-ray telescope athard energies in space. Since its launch in 2012, NuSTAR has opened up a sensitive new view on many energetic astrophysical phenomena, such as supernova explosions, black hole spin measurements and cosmic supermassive black hole accretion history. One of NuSTAR’s main discoveries is that some bright X-ray sources in other galaxies, known as ultraluminous X-ray sources (ULXs), long believed to be powered by black holes, were in fact powered by neutron stars. Some of these neutron stars were found to be radiating factors of 1,000 greater than the theoretical Eddington limit would allow, confounding theory. I will talk about the NuSTAR telescope, the discovery of neutron-star- powered ULXs, and a recent measurement of the magnetic field strength of one of these sources that has provided clues about how they radiate so powerfully.
E-mail: [email protected]
Collaboration name: NuSTAR
Quark Matter and High Energy Heavy Ion Collisions / 327
The Application of Deep Learning to Event-by-Event Simulations of Relativistic Hydrodynamics
Author: LongGang Pang1 Co-authors: Hannah Petersen 2; Horst Stoecker 2; Kai Zhou 2; Nan Su 2; Xin-Nian Wang
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1 UC Berkeley and LBNL 2 FIAS
Corresponding Author: [email protected]
The state-of-the-art pattern recognition method in machine learning (deep convolution neuralnet- work) has been used to classify two different phase transitions between normal nuclear matter and hot-dense quark gluon plasma. Large amounts of training data have been prepared by simulating heavy ion collisions with event-by-event relativistic hydrodynamics. High level correlations of par- ticle spectra in transverse momentum and azimuthal angle learned by the neural network are quite robust in deciphering the transition type in the quantum chromodynamics phase diagram. Through this study, we demonstrated that there is a traceable encoder of the phase structure that survives the dynamical evolution and exists in the final snapshot of heavy ion collisions and one canex- clusively and effectively decode this information from the highly complex output using machine learning.
E-mail: [email protected]
Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity / 325
The Simons Observatory and CMB-Stage IV
Author: Nicholas Galitzki1
1 University of California, San Diego
Corresponding Author: [email protected]
The Simons Observatory (SO) will make precision temperature and polarization measurements ofthe cosmic microwave background (CMB) over angular scales between 1 arcminute and tens of degrees using over 40,000 detectors and sampling frequencies between 27 and 270 GHz. SO will consist of a six-meter-aperture telescope coupled to over 20,000 detectors and an array of half-meter aperture refractive cameras, coupled to an additional 20,000 detectors. The unique combination of large and small apertures in a single CMB observatory will allow us to sample a wide range of angular scales over a common survey area while providing an important stepping stone towards the realization of CMB-Stage IV. CMB-Stage IV is a proposed project that will combine and expand on existing facilities in Chile and Antarctica to reach the ∼500,000 detectors required for the project’s science objectives. SO and CMB-Stage IV will measure fundamental cosmological parameters of our uni- verse, find high-redshift clusters via the Sunyaev-Zeldovich effect, constrain properties of neutrinos, and seek signatures of dark matter through gravitational lensing. The complex set of technical and science requirements for these experiments has led to innovative instrumentation solutions which we will discuss. For instance,the SO large aperture telescope will couple to a cryogenic receiver that is 2.4 m in diameter and over 2 m long, creating a number of technical challenges. We will give an overview of the drivers for, and designs of, the SO telescopes and cameras as well as the current status of the project. We will also discuss the current status of CMB-Stage IV and important next steps in the project’s development.
E-mail: [email protected]
Collaboration name: Simons Observatory
Funding source: Simons Foundation
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Nuclear Forces and Structure, NN Correlations, and Medium Effects / 63
Multi-Wire 3D Gas Tracker for Searching New Physics in Nuclear Beta Decay
Author: Dagmara Rozpedzik1
Co-authors: Adam Kozela 2; Kazimierz Bodek 1; Konrad Lojek 1; Leendert Hayen 3; Lennert De Keukeleere 3; Maciej Perkowski 1; Nathal Severijns 3
1 Jagiellonian University 2 INP PAS 3 KU Leuven
Corresponding Author: [email protected]
Searches of new physics beyond the Standard Model (SM) performed at low energy frontiers are complementary to experiments carried out at high energy colliders. Often used methods for testing the SM and beyond at low energies are precision spectrum shape and correlation coefficient mea- surements in nuclear and neutron beta decay. In order to study tiny effects in beta spectrum shape, a special spectrometer was built. It consists of a 3D low pressure gas tracker (drift chamber with hexagonal cells, signal readout at bothwire ends) and plastic scintillators for triggering a data acquisition and registration of the beta particle energy [1]. The results of the characterization process indicate the possibility of using suchagas tracker in a range of experiments with low energy electrons where beta particle tracking with mini- mal kinematics deterioration is beneficial. Application of this technique is also planned for a neutron decay correlation experiment [2]. In the presentation, the first application of this tracker in a high- precision beta spectrum shape study will be discussed. It is devoted to the determination of the weak magnetism term in nuclear beta decay [3,4].
[1] K. Lojek, D.Rozpedzik, K. Bodek, M. Perkowski, N. Severijns, NIM A 802 (2015) 38
[2] K. Bodek, Acta Phys. Pol. B, 47 (2016) 349
[3] N. Severijns, J. Phys. G: Nucl. Part. Phys. 41 (2014) 114006 [4] L. Hayen, N. Severijns, K. Bodek, D. Rozpedzik, X. Mougeot, Rev. Mod. Phys. 90 (2018) 015008
E-mail: [email protected]
PPHI / TSEI / 161
Neutron-Antineutron Conversion to Search for B-L Violation
Author: Susan Gardner1
Co-author: Xinshuai Yan 1
1 University of Kentucky
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Corresponding Author: [email protected]
Neutron-antineutron (n–n¯) conversion describes the change of a neutron into an antineutron as me- diated by an external source. As a result its ability to occur is not limited by the presence of magnetic fields or matter, as would be the case if a neutron were to transform spontaneously, or tooscillate, into an antineutron. We explore the limits on the appearance of baryon number minus lepton num- ber (B-L) violation that can be set through the study of the conversion process, notably through scattering experiments employing intense beams, and we discuss the conditions under whichsuch studies can also yield limits on the neutron’s Majorana mass.
E-mail: [email protected]
Funding source: Partial support from the U.S. Department of Energy Office of Nuclear Physics under contract DE-FG02- 96ER40989.
Dark Matter / 307
COSINE-100 and Tests of DAMA
Author: Reina Maruyama1
1 Yale University
Corresponding Author: [email protected]
Astrophysical observations give overwhelming evidence for the existence of dark matter. While the DAMA collaboration has asserted for years that they observe a dark matter-induced annual modula- tion signal in their NaI(Tl)-based detectors, their observations are inconsistent with those from other direct detection dark matter experiments under most assumptions of dark matter. I will describe the COSINE-100 experiment and other low-background NaI(Tl)-based dark matter experiments, and our progress toward resolving the current stalemate in the field.
E-mail: [email protected]
Collaboration name: COSINE-100
Funding source: NSF, Sloan
NFS / QCDHS / 194
Status of Baryon-Baryon Interactions from Lattice QCD
Author: Silas Beane1
1 University of Washington
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Corresponding Author: [email protected]
I will review recent progress in obtaining baryon-baryon phase shifts and several paradigmatic re- action rates from lattice QCD simulations.
E-mail: [email protected]
Collaboration name: NPLQCD
Funding source: US Department of Energy
TSEI / PHE / 109
Review of the First W Boson Mass Measurement with the ATLAS Detector
Author: Fabrice Balli1
1 CEA Saclay
Corresponding Author: [email protected]
A precise measurement of the W boson mass represents an important milestone to test the overall consistency of the Standard Model. Since the discovery of a Higgs Boson, the W boson mass is predicted to 7 MeV precision, while the world average of all measurements is 15 MeV, making the improved measurement an important goal. Large samples of leptonic decays of W and Z bosons were collected by the ATLAS detector with efficient single lepton triggers in the 7 TeV data setcor- responding to an integrated luminosity of 4.6 fb−1. With these samples the detector and physics modelling has been studied in great detail and enabled a W boson mass measurement with a preci- sion of 19 MeV, which will be presented in this talk. Special focus will be drawn on the modeling of the production processes of W bosons in proton-proton collisions, that are crucial for this measure- ment.
E-mail: [email protected]
Collaboration name: ATLAS Collaboration
Dark Matter / 335
Dark Matter Interpretation of the Galactic Center Gamma Ray Excess
Author: Ryan Keeley1
1 University of California Irvine
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Corresponding Author: [email protected]
The Milky Way’s Galactic Center harbors a gamma-ray excess that is a candidate signalofanni- hilating dark matter. Dwarf galaxies remain predominantly dark in their expected commensurate emission. In this talk I will discuss the degree of consistency between these two observations, quan- tified through a joint likelihood analysis. Doing so will incorporate Milky Way dark matterhalo profile uncertainties, as well as an accounting of diffuse gamma-ray emission uncertainties indark matter annihilation models for the Galactic Center Extended gamma-ray excess (GCE) detected by the Fermi Gamma-Ray Space Telescope. The preferred range of annihilation rates and masses ex- pands when including these unknowns. Even so, using two recent determinations of the Milky Way halo’s local density leave the GCE preferred region of single-channel dark matter annihilation mod- els to be in strong tension with annihilation searches in combined dwarf galaxy analyses. This joint likelihood analysis allows us to quantify this inconsistency. This analysis allows for testing dark matter annihilation models’ consistency within this combined dataset. As an example, we test arep- resentative inverse Compton sourced self-interacting dark matter model, which is consistent with both the GCE and dwarfs.
E-mail: [email protected]
Precision Physics at High Intensities / 172
Probing BSM and High-x Physics with SoLID at JLab
Author: Paul Souder1
1 Syracuse University
Corresponding Author: [email protected]
The SoLID spectrometer is being designed at JLab in order to provide a high luminosity andhigh- acceptance device for studies of parity-violation in deep inelastic scattering (PVDIS). The PVDIS studies will measure the vector-electron and axial-quark coupling, which is small in the Standard Model and thus provides a good test of BSM physics. In addition, the method provides a unique way to measure physics at large Bjorken x. Charge symmetry violation can be isolated with a deuterium target and an isovector EMC effect can be studied in a neutron-rich nucleus suchas 48Ca. In addition, quark-quark correlations can be isolated in higher-twist effects. With a proton target, the d/u PDF ratio can be measured directly without making corrections for nuclear targets. These topics will be reviewed in the context of recent theoretical and experimental developments.
E-mail: [email protected]
Collaboration name: SoLID Collaboration
Heavy Flavors and the CKM Matrix / 187
0 Short-Distance Matrix Elements for D -Meson Mixing from Nf = 2 + 1 Lattice QCD
Author: Chia Cheng Chang1
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1 LBL
Corresponding Author: [email protected]
We calculate in three-flavor lattice QCD the short-distance hadronic matrix elements of allfive ∆C = 2 four-fermion operators that contribute to neutral D-meson mixing both in and beyond the Standard Model. We use the MILC Collaboration’s Nf = 2 + 1 lattice gauge-field configurations generated with asqtad-improved staggered sea quarks. We also employ the asqtad action for the valence light quarks and use the clover action with the Fermilab interpretation for the charm quark. We analyze a large set of ensembles with pions as light as Mπ ≈ 180 MeV and lattice spacings as fine as a ≈ 0.045 fm, thereby enabling good control over the extrapolation to the physical pion mass and continuum limit. We obtain for the matrix elements in the MS − NDR scheme using the choice of evanescent operators proposed by Beneke et al., evaluated at 3 GeV. To illustrate the util- ity of our matrix-element results, we place bounds on the scale of CP-violating new physics in D0 mixing, finding lower limits of about 10–50 ×103 TeV for couplings of O(1). To enable our results to be employed in more sophisticated or model-specific phenomenological studies, we provide the correlations among our matrix-element results. For convenience, we also present numerical results in the other commonly used scheme of Buras, Misiak, and Urban.
E-mail: [email protected]
Collaboration name: FNAL/MILC
Funding source: DOE
Parton and Gluon Distributions in Nucleons and Nuclei / 5
Unpolarised Parton Distribution Functions Today: Needs, Achieve- ments and Challenges
Author: Emanuele Roberto Nocera1
1 Higgs Centre for Theoretical Physics
Corresponding Author: [email protected]
I review recent progress in the determination of the unpolarised parton distribution functions (PDFs) of the proton. I focus on how the needs for accuracy and precision in current and future programs at high-energy accelerators are addressed in contemporary PDF sets. I discuss the impact on PDFs of the uncertainties coming from the data, the theory and the methodology, and I outline some corresponding challenges in their assessment.
E-mail: [email protected]
TSEI / PHE / 377
The Weak Charge: From Atoms to the Z-Pole
Author: Mikhail Gorshteyn1
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1 University of Mainz
Corresponding Author: [email protected]
I review the status of theoretical calculations that empower the precise determination of the weak mixing angle across the whole range of currently accessible energies. The key ingredients include 2 the EW running of sin θW , and applications of the dispersion relations to radiative corrections that involve effects of the strong interaction. The upcoming low-energy experiments with polarized electrons will be sensitive to a wide range of New Physics, heavy and light, thus complementing collider searches.
E-mail: [email protected]
Precision Physics at High Intensities / 222
Physics with Electroweak Probes at the Electron-Ion Collider
Author: Nils Feege1
1 Stony Brook University
Corresponding Author: [email protected]
The Electron-Ion Collider (EIC) will be the first facility to collide spin-polarized electrons withpolar- ized protons, polarized light ions, and unpolarized heavy ions at high luminosity. Using the Standard Model electroweak interactions, the EIC will provide unprecedented insights into the structure of nucleons and nuclei and the partonic dynamics inside them. In addition, it will allow for precisely measuring parameters of the electroweak Standard Model itself. Finally, the EIC will open up pos- sibilities to look for rare phenomena beyond the Standard Model complementary to the LHC and fixed target experiments around the world. This talk discusses the capabilities of experiments atthe EIC to constrain nucleon structure functions using deep inelastic scattering meditated by W and Z bosons, to measure the weak mixing angle in a new kinematics range, and to search for electron-to- tau charged lepton flavor violation.
E-mail: [email protected]
Heavy Flavors and the CKM Matrix / 337
B and D Meson Leptonic Decay Constants and Quark Masses from Four-Flavor Lattice QCD
Author: Carleton DeTar1
Co-authors: Aida El-Khadra 2; Alexei Bazavov 3; Andreas Kronfeld 4; Antonio Vairo 5; Claude Bernard 6; Doug Toussaint 7; Elvira Gamiz 8; Ethan Neil 9; James Simone 4; Javad Komijani 5; John Laiho 10; Nathan Brown 6; Nora Brambilla 5; Paul Mackenzie 4; Robert Sugar 11; Ruth Van de Water 4; Steven Gottlieb 12; Urs Heller 13
1 University of Utah 2 University of Illinois at Urbana-Champaign 3 Michigan State University
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4 Fermilab 5 Technical University, Munich 6 Washington University 7 University of Arizona 8 Univ. Granada 9 University of Colorado 10 Syracuse University 11 UC Santa Barbara 12 Indiana University 13 APS
Corresponding Author: [email protected]
We describe a recent lattice-QCD calculation of the leptonic decay constants of heavy-light pseu- doscalar mesons containing charm and bottom quarks and of the masses of the up, down, strange, charm, and bottom quarks. Results for these quantities are of the highest precision to date. Calcula- tions use over twenty isospin-symmetric ensembles of gauge-field configurations with six different lattice spacings down to approximately 0.03 fm and several values of the light-quark masses down to physical values of the average up and down sea-quark masses. We use the highly-improved staggered-quark (HISQ) formulation for valence and sea quarks, including the bottom quark. The analysis employs heavy-quark effective theory (HQET). A novel HQET method is used in the deter- mination of the quark masses.
E-mail: [email protected]
Collaboration name: Fermilab Lattice, MILC, and TUMQCD
Funding source: DOE, NSF, MINECO (Spain), Junta de Andalucia (Spain), DFG (Germany), SFTC (UK), German Excel- lence Initiative, EU Seventh Framework, EU Marie Curie COFUND
Parton and Gluon Distributions in Nucleons and Nuclei / 181
Parton Distribution Functions with Intrinsic Charm and Other News from CTEQ
Author: Marco Guzzi1
1 Kennesaw State University
Corresponding Author: [email protected]
We investigate the possibility of a (sizable) nonperturbative contribution to the charm parton distri- bution function (PDF) in a nucleon, theoretical issues arising in its interpretation, and its potential impact on LHC scattering processes. We discuss separation of the universal component of thenon- perturbative charm from the rest of the radiative contributions and estimate its magnitude in the CTEQ global QCD analysis at the next-to-next-to leading order in the QCD coupling strength, in- cluding the latest experimental data from HERA and the Large Hadron Collider.
E-mail: [email protected]
Collaboration name:
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CTEQ-TEA
NFS / QCDHS / 316
HOBET: The SM as an Effective Theory and its Direct Matching to LQCD
Author: Kenneth McElvainNone Corresponding Author: [email protected]
The configuration interaction shell model operates in a subset of the complete Hilbert spacedefined by projection operator P. Unless P is very large, an effective theory treatment is required. Historically, the renormalization into P has been done informally, by adding a few physically motivated operators with associated parameters to the matrix elements of a realistic or chiral potential. The parameters are then tuned to reproduce a selected set of observables. While this approach has some success in reproducing the excitation spectrum of nuclei, the contact with the wave function is lost. Also, even if the P spaceD wave function E were the projection of the full wave function, the evaluation of
a bare operator f P OPˆ i between projections of initial and final states would miss longer and shorter range contributions from excluded states defined by Q=1-P and be scaled by the unknown and relatively small fraction of the wave function contained in P. In this presentation, we describe the formal construction of the shell model as an effective theory along with answers for the renormalization of operators to account for contributions of parts of the wave function outside P and the wave function normalization. The underlying effective interaction can be expressed as an expansion whose LECs can be constrained by observables such as scattering phase shifts and binding energies, or the spectrum of two nucleons in a periodic volume ascomes from LQCD calculations.
E-mail: [email protected]
Collaboration name: CalLat
Funding source: UC Berkeley
Dark Matter / 224
GAPS: a New Cosmic-Ray Antimatter Experiment
Author: Sean Quinn1
1 University of California, Los Angeles
Corresponding Author: [email protected]
The General AntiParticle Spectrometer (GAPS) is a balloon-borne instrument designed todetect cosmic-ray antimatter using the novel exotic atom technique, obviating strong magnetic fields re- quired by experiments like AMS, PAMELA, or BESS. It will be sensitive to primary antideuterons with kinetic energies of ≈ 0.05 − 0.2 GeV/nucleon, providing some overlap with the previously mentioned experiments at the highest energies. For 35 × 3 day balloon flights, and certain classes
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of primary antideuteron propagation models, GAPS will be sensitive to mDM ≈ 10 − 100 GeV c−2 WIMPs with a dark-matter flux to astrophysical flux ratio approaching 100. This clean primary channel is a key feature of GAPS and is crucial for a rare event search. Additionally, the antiproton spectrum will be extended to cover the 0.07 ≤ E ≤ 0.25 GeV domain. For E > 0.2 GeV GAPS data will be complementary to established experiments, while E < 0.2 GeV explores a new regime. The first flight is scheduled for late 2020 in Antarctica. This talk will describe the astrophysical processes and backgrounds relevant to the dark matter search, a brief discussion of detector operation, and construction progress made to date.
E-mail: [email protected]
Collaboration name: GAPS
Funding source: NASA
Precision Physics at High Intensities / 174
Latest Updates from the AlCap Experiment
Author: Andrew EdmondsNone
Corresponding Author: [email protected]
The AlCap experiment is a joint venture between the COMET and Mu2e collaborations tomeasure the rate and spectrum of particles emitted after nuclear muon capture on aluminium. Both collabo- rations will search for the charged lepton flavour violating process of neutrinoless muon-to-electron conversion by stopping muons in an aluminium target and so knowledge of other particles emitted during this process is important. The AlCap charged particle emission data was collected at thePaul Scherrer Institut in Switzerland over two runs in 2013 and 2015. In this talk, the experiment will be described and results will be presented.
E-mail: [email protected]
Collaboration name: AlCap Collaboration
TSEI / PHE / 280
Prospects for New Atomic Parity Violation Experiments
Author: Gerald Gwinner1
1 University of Manitoba
Corresponding Author: [email protected]
Low-energy precision tests of electro-weak physics keep playing an essential role in the search for new physics beyond the Standard Model. Atomic parity violation (APV) experiments measure the
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strength of highly forbidden atomic transitions induced by the exchange of Z bosons between elec- trons and quarks in heavy atoms. APV is sensitive to additional interactions such as leptoquarks, and provides complementary sensitivity to weak, parity-violating electron-quark couplings relative to parity-violating electron scattering. Our group is working towards a measurement in francium, the heaviest alkali, where the APV signal is about 18 times larger than in cesium. Since francium has no stable isotopes, we have established an online laser trap at the ISAC radioactive beam facility at TRIUMF that can confine millions of cold francium atoms at micro-Kelvin temperatures in avolume of approximately 1 cubic mm, an ideal environment for precision spectroscopy. I will report on our first observation of the E1-forbidden 7s–8s transition, and discuss the prospects for improved APV measurements in francium and in general.
E-mail: [email protected]
Funding source: Supported by NSERC and TRIUMF via NRC (Canada), NSF and DOE (USA).
Parton and Gluon Distributions in Nucleons and Nuclei / 204
Probing the Nucleon and Nucleus Structures with Drell-Yan Pro- cess Induced by a 120 GeV/c Proton Beam
Author: Andrew Chen1
1 Univ. of Illinois, Urbana-Champaign
Corresponding Authors: [email protected], [email protected]
To investigate the sea-quark asymmetry of the proton, the SeaQuest experiment at Fermilab uses a proton beam of 120 GeV/c interacting with liquid Hydrogen or Deuterium. Alongside of that the SeaQuest also probes the quark energy loss and EMC effect using targets of Iron, Carbonand Tungsten. Data taking ended in July of 2017, having recorded dimuon events from 1.4×1018 protons interacting with various targets. A preliminary result of extracting sea-quark asymmetry will be given in this presentation. Progress in understanding quark energy loss and the nuclear EMC effect will also be presented.
E-mail: [email protected]
Collaboration name: SeaQuest
NFS / QCDHS / 296
Effective-Field-Theory Extrapolations of Lattice-QCD Predictions for Light Nuclei
Author: Johannes Kirscher1
1 The City College of New York
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Corresponding Author: [email protected]
I will present work which utilizes few-nucleon observables, predicted with the lattice technique from quantum chromodynamics, to calibrate an effective interaction theory for nucleons (the pi- onless effective field theory) in order to assess the sensitivity of larger nuclei, their ground-state and scattering properties and electromagnetic responses, with respect to the unphysical changes in the lattice formulation of QCD — the large quark/pion masses, in particular. The presentation will include our latest investigations on multi-neutron cluster and the mass gap as represented by the five-nucleon system.
E-mail: [email protected]
Heavy Flavors and the CKM Matrix / 295
Semileptonic Bs Decays
Author: Oliver Witzel1
1 University of Colorado Boulder
Corresponding Author: [email protected]
Semileptonic Bs → Kℓν and Bs → Dsℓν decays provide an alternative b-decay channel to de- termine the CKM matrix elements |Vub| and |Vcb| or obtain R-ratios to investigate lepton flavor universality violations. In addition, these decays may shed further light on the discrepancies seen in the analysis of inclusive vs. exclusive decays. Using the nonperturbative methods of lattice QCD, theoretical results are obtained with good precision and full control over systematic uncertainties. This talk will highlight ongoing efforts ofthe B-physics program by the RBC-UKQCD collabora- tion.
E-mail: [email protected]
Collaboration name: RBC-UKQCD Collaboration
TSEI / PHE / 367
Parity Violating Electron Scattering Experiments for an Ultra Pre- cise Determination of the Weak Mixing Angle at Low Energies
Author: Frank Maas1
1 Helmholtz Institute Mainz
Corresponding Author: [email protected]
Parity violating electron scattering off unpolarised electrons or unpolarised protons at low momen- tums transfer (well below Z-pole) is an ideal tool to test the Standard Model and search for BSM- physics up to a mass scale of about 50 TeV, complementary to the new physics searches at high
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energies at the LHC. The future MOLLER experiment at JLab and the future P2 experiment atthe upcoming MESA facility in Mainz are designed to reach an accuracy of order per mille in the mea- surement of the weak mixing angle and are sensitive to partly different Standard Model extensions. Both experiments and their prospective physics reach will be discussed.
E-mail: [email protected]
Collaboration name: MOLLER and P2 Collaborations
Dark Matter / 164
Cosmological Bounds on Non-Abelian Dark Forces
Author: Lindsay Forestell1
Co-authors: David Morrissey 2; Kris Sigurdson 3
1 TRIUMF, UBC 2 TRIUMF 3 University of British Columbia
Corresponding Author: [email protected]
Non-Abelian dark gauge forces that do not couple directly to ordinary matter may be realized in nature. If the dark sector is reheated in the early universe, it will be realized as a set of dark gluons at high temperatures and as a collection of dark glueballs at lower temperatures, with a cosmological phase transition from one form to the other. These glueballs can be, if left alone, the cosmological dark matter. We explore the parameter space needed to satisfy present day densities. However, de- spite being dark, these new glueball states can also connect indirectly to the Standard Model through various operators. These interactions will transfer energy between the dark and visible sectors, and they allow some or all of the dark glueballs to decay. We investigate the cosmological evolution and decays of dark glueballs in the presence of connector operators to the Standard Model. Dark glueball decays can modify cosmological and astrophysical observables, and we use these considerations to put very strong limits on the existence of pure non-Abelian dark forces. On the other hand, if one or more of the dark glueballs are stable, we find that they can potentially make up the dark matter of the universe.
E-mail: [email protected]
Precision Physics at High Intensities / 308
Muon Capture as a Probe of the Weak Axial Current
Author: Peter Kammel1
1 CENPA, UW Seattle
Corresponding Author: [email protected]
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Muon capture provides a powerful tool to study the properties and structure of the nucleon and few nucleon systems predicted by chiral effective theories founded on Quantum Chromodynamics. Our program focuses on capture from the simplest of all muonic atoms, muonic hydrogen (MuCap experiment) as well as muonic deuterium (MuSun experiment), by using a novel active target method based on the development of high pressure time projection chambers filled with hydrogen/deuterium gas. In this contribution we discuss two applications. Nucleon axial radius and muonic hydrogen. In a recent review [1] the model independent re-evaluation 2 2 [2] of the axial radius squared rA(z exp.) = 0.46(22) fm from νd scattering and the muon capture rate in hydrogen measured in MuCap was used to update the value of the induced pseudoscalar form 2 2 factor gP and, alternatively, to determine an independent rA(MuCap) = 0.46(24) fm from muon capture. MuSun and astrophysics neutrino reaction. The precision measurement of the capture rate for µd → nnν in MuSun will determine a critical low-energy constant in effective field theories, required for the calculation of fundamental astrophysics reactions like solar pp fusion and νd scattering at SNO. Data taking of the experiment was successfully concluded and the analysis is in an advanced state. [1] Richard J Hill et al, Rep. Prog. Phys. in press (2018), http://iopscience.iop.org/article/10.1088/1361- 6633/aac190 [2] A.S. Meyer et al, Phys.Rev. D 93, 113015 (2016)
E-mail: [email protected]
Collaboration name: MuSun Collaboration
Funding source: U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Award No. DE-FG02- 97ER41020
Parton and Gluon Distributions in Nucleons and Nuclei / 110
Electroweak, Jet and Heavy Flavor Probes in Proton-Lead Colli- sions at the LHC
Author: Soumya Mohapatra1
1 Columbia University
Corresponding Author: [email protected]
Measurements of isolated prompt photon, massive electroweak boson, and jet production in small collision systems are of great interest to understanding the partonic structure of heavy nuclei, and serve as a constraint on the initial state in larger collision systems. These channels are sensitive to a variety of effects such as the modification of the parton densities in nuclei, including thepossi- ble onset of non-linear QCD effects in certain kinematic regions, and the energy loss of partonsas they undergo multiple interactions in the nucleus√ before the hard parton-parton scattering. High- statistics samples of proton–lead collision data at sNN = 5.02 TeV and 8.16 TeV taken in 2016, as well as proton–proton comparison data at analogous collision energies, allow for a detailed study of these phenomena in data and comprehensive comparisons to the predictions of a variety of the- oretical approaches. This talk presents the latest ATLAS and CMS results in these and other topics, including new results from Run 2 proton–lead collisions on inclusive prompt photon production over a broad kinematic range, and angular correlations of forward dijets intended to probe the small-x region. Results will also be shown on yields and two-particle correlations involving open and closed
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heavy flavor mesons, both measured directly and through their semileptonic decays, to study energy loss and transport properties of heavy quarks in the QGP.
E-mail: [email protected]
Collaboration name: ATLAS Collaboration
Heavy Flavors and the CKM Matrix / 18
Unify the SU(3) Topological Diagram and Irreducible Representa- tion Amplitudes for B Decays
Author: XIAO-GANG HE1
1 NTU/SJTU
Corresponding Author: [email protected]
Flavor SU(3) analysis of B meson charmless hadronic two light pseudoscalar decays can be formu- lated in two different ways. One is to construct the SU(3) irreducible representation amplitude (IRA) according to effective Hamiltonian transformation properties, and the other is to draw the topolog- ical diagrams (TDA). We first point out that previous analyses of TDA and IRA approaches donot match in several aspects, in particular a few SU(3) independent amplitudes have been overlooked in the TDA approach. This has caused confusions in the past and sometimes resulted in incorrect interpretation of data. We then demonstrate that only if these amplitudes are included, a consistent and unified picture can be obtained. With the new TDA amplitudes, all charmless hadronic decaysof heavy meson must have nonzero direct CP symmetries as already predicted by the IRA approach. In addition to their notable impact on CP asymmetry, the new amplitudes are also important to extract new physics information.
E-mail: [email protected]
NFS / QCDHS / 72
New Developments in Lattice Effective Field Theory
Author: Dean Lee1
1 Michigan State University
Corresponding Author: [email protected]
I discuss new progress in performing first principles lattice simulations of nuclear systems using the framework of effective field theory. Some of the topics to be covered are the connections between bare nuclear forces and nuclear structure and a new algorithm for studying the thermodynamics and spectra of nuclei.
E-mail:
Page 131 CIPANP 2018 - Thirteenth Conference on the Intersections of Particle … / Book of Abstracts [email protected]
Collaboration name: Nuclear Lattice Effective Field Theory Collaboration
Funding source: Department of Energy
TSEI / PHE / 365
High Precision Extraction of AFB at the LHC
Author: Arie Bodek1
1 University of Rochester
Corresponding Author: [email protected]
We report on the extraction of the electroweak mixing angle from precision measurements of the forward-backward asymmetry (AFB) in dilepton events produced at the large hadron collider.
E-mail: [email protected]
Collaboration name: CMS (reporting also for ATLAS and LHCb)
Funding source: DOE
Precision Physics at High Intensities / 352
Antimatter Gravity with Muonium
Author: Daniel Kaplan1
1 Illinois Institute of Technology
Corresponding Author: [email protected]
The gravitational acceleration of antimatter, g¯, has yet to be directly measured; an unexpected out- come of its measurement could change our understanding of gravity, the universe, and the possibil- ity of a fifth force. Three avenues are apparent for such a measurement: antihydrogen, positronium, and muonium, the last requiring a precision atom interferometer and novel muonium beam under development. The interferometer and its few-picometer alignment and calibration systems appear feasible. With 100 nm grating pitch, measurements of g¯ to 10%, 1%, or better can be envisioned. These could constitute the first gravitational measurements of leptonic matter, of 2nd-generation matter, and possibly, of antimatter.
E-mail: [email protected]
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Collaboration name: MAGE
Dark Matter / 155
Signatures of Superradiant Axions from Lasing and Binary Merger Events
Author: Srimoyee Sen1
1 University of Washington
Corresponding Author: [email protected]
Superradiant axions around black holes can produce electromagnetic signatures via lasing or via conversion to photons in a strong magnetic field. The latter can also produce gravitational wave signatures besides electromagnetic ones in binary merger events involving a strongly magnetized neutron star and a black hole (BHNS). Due to the smallness of the axion mass, medium effects of the black hole environment and the interstellar medium can significantly affect electromagnetic signatures from lasing. I discuss these medium effects and the conditions under which lasing can take place. I also find that a significant fraction of the energy in the axion condensate canbere- leased via photons in a strong magnetic field of a neutron star within the characteristic time scale of merger events. This could lead to signatures in gravitational waves from merger events ofBHNS pairs.
E-mail: [email protected]
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 92
Current Status of Nuclear Forces from Chiral EFT
Author: Evgeny Epelbaum1
1 Ruhr-University Bochum
Corresponding Author: [email protected]
Nuclear forces derived in chiral EFT are nowadays extensively used to study low-energy reactions and to describe various properties of nuclei and nuclear matter. I review the current status of the theory and describe our recent efforts towards developing this theoretical approach into a precision tool. Topics addressed include the two- and three-nucleon forces, applications to light systems and uncertainty quantification.
E-mail: [email protected]
Quark Matter and High Energy Heavy Ion Collisions / 237
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Jet Measurements in Heavy Ion Collisions
Author: Christine Nattrass1
1 University of Tennessee, Knoxville
Corresponding Author: [email protected]
The Quark-Gluon Plasma (QGP) is created in high energy heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC). This medium is transparent to electromagnetic probes but nearly opaque to colored probes. Hard partons produced early in the collision fragment and hadronize into a collimated spray of particles called a jet. The partons lose energy as they traverse the medium, a process called jet quenching. Most of the lost energy is still correlated with the parent parton, contributing to particle production at larger angles and lower momenta relative to the parent parton than in proton-proton collisions. This partonic energy loss can be measured through several observables, each of which give different insights into the degree and mechanism of energy loss. The measurements to date are summarized and the path forward is discussed.
E-mail: [email protected]
Particle and Nuclear Astrophysics / 247
Sites of the r-process: supernovae and mergers: Recent Successes and Current Issues
Author: Chris Fryer1
1 Los Alamos National Laboratory
Corresponding Author: [email protected]
Many of the heavy elements in the universe are produced through the rapid capture of neutrons onto iron peak elements, the so-called r-process. Sites for this crucial heavy element production are necessarily extreme and leading proposals invoke conditions at the heart of the engines behind super- novae and gamma-ray bursts. These models include neutrino-driven winds, magnetically-contained winds, magnetically-driven outflows, and disk winds around a collapsed star as well as thewinds and dynamical ejecta from the merger of two neutron stars or a neutron star and a black hole. Here we review these sites, their successes and problems in an effort to gain a more complete picture of the production of the heavy elements made in the r-process.
E-mail: [email protected]
Collaboration name: Chris Fryer
Funding source: DOE
Parton and Gluon Distributions in Nucleons and Nuclei / 17
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TMDs - Transverse Connections Between Nuclear and Particle Physics
Author: Andrea Signori1
1 Jefferson Lab
Corresponding Author: [email protected]
Uncertainties generated by our ignorance of hadronic structure hamper precision calculations for high-energy scattering processes. Transverse-momentum-dependent (TMD) distributions give a quantitative representation of hadronic structure in a three-dimensional momentum space and encode all the possible spin and momentum correlations between a hadron and its constituents. Extractions of TMDs from hard scattering experiments rely both on the availability of multi-dimensional data sets and on the applicability of the TMD formalism. In this talk I will report about recent progress in the formalism that can have an impact on the phe- nomenology of TMD distributions. In particular, I will discuss which kinematic regions are most sensitive to the nonperturbative struc- ture of the TMDs and which current and future experiments can provide data in these regions. I will also discuss how to access quark and gluon TMD distribution and fragmentation functions in specific scattering processes and, finally, investigate what is the expected impact of TMDsonvery high energy scattering processes, such as W boson production at the Large Hadron Collider.
E-mail: [email protected]
NMNM / TSEI / 253
Sterile Neutrinos in the Early Universe
Author: George Fuller1
1 University of California, San Diego
Corresponding Author: [email protected]
I will give an overview of sterile neutrino physics in the early universe and in cosmology, especially as regards dark matter. This will include a discussion of production mechanisms, relic densities, the relationship of these to lepton and baryon numbers, and associated high energy scale physics issues. I will also discuss the status of X-ray observational constraints on sterile neutrino and other light dark matter, dark matter candidates.
E-mail: [email protected]
Funding source: National Science Foundation
QCD, Hadron Spectroscopy, and Exotics / 158
Analysis of ηπ0 and η/ π0 Systems at GlueX
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Author: Alexander Austregesilo1
1 Jefferson Lab
Corresponding Author: [email protected]
The GlueX experiment at Jefferson Lab aims to study the light-quark meson spectrum withanem- phasis on the search for hybrid mesons. The ηπ0 and η/ π0 final states are promising channels for this search. Several experiments have observed a contribution with exotic quantum numbers in these channels in the past, but the resonance interpretation is not well established. GlueX will con- tribute significant complementary information to this discussion by studying the production witha polarized 9 GeV photon beam. The comparison between both channels can shed light on the nature of the exotic mesons, in particular their flavor content. We will present preliminary results obtained from an initial dataset recorded in 2017.
E-mail: [email protected]
Collaboration name: GlueX Collaboration
Funding source: U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177
NMNM / TSEI / 294
Non-Standard Neutrino Interactions
Author: Andre de Gouvea1
1 Northwestern University
Corresponding Author: [email protected]
I discuss the status of non-standard neutrino interactions, especially their impact on next-generation neutrino oscillation experiments.
E-mail: [email protected]
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 342
Microscopic Shell Model Interactions and Effective Operators
Author: Scott Bogner1
1 Michigan State University
Corresponding Author: [email protected]
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As experimental efforts have shifted towards the study of rare isotopes, the predictive powerofthe wildly successful (but heretofore phenomenological) nuclear shell model is challenged by the scarcity of nearby data to constrain its parameters. Therefore, the ability to reliably calculate these param- eters directly from the underlying nuclear forces, and relying less on experimental data, becomes increasingly urgent as we move away from stable nuclei. In this talk, I summarize recent progress towards this goal using the in-medium similarity renormalization group (IM-SRG) to construct mi- croscopic shell model interactions and effective operators starting from the underlying inter-nucleon forces and currents.
E-mail: [email protected]
Funding source: NSF
Parton and Gluon Distributions in Nucleons and Nuclei / 108
Transverse Spin Related Measurements at RHIC
Author: Oleg Eyser1
1 Brookhaven National Laboratory
Corresponding Author: [email protected]
The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory is the world’s onlypo- larized proton collider with center-of-mass energies up to 500 GeV and beam polarizations of about 60% at the highest energies. It provides unique opportunities to study the spin structure in hadronic systems and opens new kinematic regions compared to deep inelastic scattering experiments. Trans- verse spin effects have been among the most surprising discoveries in nuclear physics and theyare an essential tool in order to separate the intrinsic properties of hadrons from interaction dependent dynamics in the framework of QCD factorization. This talk will discuss the latest achievements from the RHIC experiments related to nuclear spin orbit correlations and spin dependent fragmentation functions, universality of transverse momentum dependent distribution functions, and results from proton-nucleon collisions.
E-mail: [email protected]
Collaboration name: RHIC Spin Collaboration
QCD, Hadron Spectroscopy, and Exotics / 80
Toward Precise Determination of Resonant Hadron Scattering Am- plitudes from Lattice QCD
Author: John Bulava1
1 CP3-Origins, U. of Southern Denmark
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Corresponding Author: [email protected]
Given recent progress in the determination of scattering amplitudes from lattice QCD calculations, systematic errors due to the finite lattice spacing and simulation volume must now be controlled in order to provide quantitative QCD predictions for the properties of excited hadrons. To this end, I will present a calculation of the pion-pion scattering amplitude near the ρ(770) resonance, as well as the corresponding isovector timelike pion form factor, in which a complete systematic study is performed. Ongoing calculations of amplitudes containing the K∗(892), ∆(1232), and Λ(1405) resonances will also be presented.
E-mail: [email protected]
Particle and Nuclear Astrophysics / 176
Properties of the Binary Neutron Star Merger GW170817
Author: Benjamin Lackey1
1 Max Planck Institute for Gravitational Physics
Corresponding Author: [email protected]
Observations of binary neutron star mergers such as GW170817 by the LIGO and Virgo gravitational- wave detectors provide unique ways of constraining the equation of state through tidal interactions and potential observations of a post-merger signal. In this work we improve initial estimates of the parameters of GW170817 using the known source location, improved waveform modeling, addi- tional data down to 23 Hz compared to the 30 Hz in the initial analysis, and re-calibrated Virgo data. We compare results inferred using several waveform models which incorporate additional physi- cal effects as compared to the initial TaylorF2 waveform reported with the discovery of GW170817. These effects include precession, the spin induced quadrupole moment, and tidal effects calibrated with numerical simulations. We report updated constraints on the masses, spins, and tidal param- eters, and compare these results to predictions from various equation of state models. Finally, we perform an unmodeled Bayesian analysis to place upper limits on the amplitude and spectral energy density of the unobserved post-merger signal.
E-mail: [email protected]
Collaboration name: LIGO Scientific Collaboration and Virgo Collaboration
Quark Matter and High Energy Heavy Ion Collisions / 361
The Theory of Jets in Dense Matter
Author: Abhijit Majumder1
1 Wayne State University
Corresponding Author: [email protected]
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The quenching of hard jets in relativistic heavy-ion collisions has become the leading probeofthe properties of the Quark-Gluon-Plasma (QGP) formed in these collisions. Formed in rare hard inter- actions, jets traverse the entire space-time profile of the exploding plasma and are modified byit. The detailed study of these modifications reveals clues about the internal structure oftheQGP.In this talk I will conduct a broad survey of the field of jet modification in dense matter, outlining the variety of observables that are now available and what can be discerned from these. I will also focus on the evolving technology of Monte-Carlo event generators and how these can become probing tools in the study of the QGP.
E-mail: [email protected]
Collaboration name: JETSCAPE
Funding source: DOE, NSF
NMNM / TSEI / 25
Detecting CP Violation in the Presence of Non-Standard Neutrino Interactions
Author: Jeffrey Hyde1
1 Goucher College
Corresponding Author: [email protected]
New physics beyond the Standard Model could appear at long baseline oscillation experiments as non-standard interactions (NSI) between neutrinos and matter. If so, determination of the CP- violating phase δ13 is ambiguous due to interference with additional complex phases. I’ll present my work using both numerical solutions and a perturbative approach to study oscillation probabili- ties in the presence of NSI. I’ll show how the CP phase degeneracies are visualized on biprobability plots, and the extent to which the energy spectrum for a given baseline length can help resolve them.
E-mail: [email protected]
Parton and Gluon Distributions in Nucleons and Nuclei / 348
Transverse Momentum Distributions: Recent News from HER- MES and COMPASS
Author: Bjoern Seitz1
1 University of Glasgow
Corresponding Author: [email protected]
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Transverse momentum dependent distribution functions offer deep insights into the quark and gluon structure of the nucleon. Measuring asymmetries in Semi-Inclusive Deep Inelastic Scattering (SIDIS) of charged leptons off longitudinally and transversely polarised nucleons offers access to a variety of transverse momentum dependent distribution functions (TMD). The HERMES and COMPASS experiments are providing SIDIS asymmetries observed in meson-electroproduction off polarised protons and neutrons, establishing the underlying reaction mechanism and providing constraints and input to the modelling of TMDs. The presentation will present and review the latest results from these experiments.
E-mail: [email protected]
Collaboration name: HERMES
Funding source: Science and Technologies Facilities Council, UK
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 106
Experimental Tests of Ab Initio Calculations of Nuclear Struc- ture
Author: Alan Wuosmaa1
1 University of Connecticut
Corresponding Author: [email protected]
Ab Initio or first-principle methods have been very successful in calculating many properties oflight nuclei. These methods use the most modern formulations of two- and three-nucleon interactions and have provided very accurate reproductions of the binding energies and level spectra for light nuclei over the past several years. These approaches have also been used to predict other properties, such as spectroscopic overlaps, nucleon densities and correlations, and electro-magnetic transition rates. In some cases, the agreement between theory and experiment has been less good, with notable dis- crepancies between data and predictions. I will describe two very different experiments that provide varied data that may be compared to predictions from Quantum Monte Carlo calculations. The first involves the Z dependence of E2 electro-magnetic transition rates in the T=1 (10C,10B,10Be) triplet. The second example concerns spectroscopic overlaps and two-neutron densities in the so-called “super-heavy” isotope of hydrogen 5H, studied by proton removal with the 6He(d,3He)5H reaction at the National Superconducting Cyclotron Laboratory at Michigan State University.
E-mail: [email protected]
Funding source: Work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Awards No. DE-FG02-04ER41320, No. DE-SC0014552, No. DE-FG02-87ER40316, and No. DE-AC02- 06CH11357, and the U.S. National Science Foundation under Grants No. PHY-1068192 and No. PHY- 1102511.
Particle and Nuclear Astrophysics / 177
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Numerical Simulations of Neutron Star Mergers
Author: Francois Foucart1
1 University of New Hampshire
Corresponding Author: [email protected]
The observation of gravitational waves and electromagnetic signals powered by the merger oftwo neutron stars has already provided us with a wealth of information about compact objects, high- energy astrophysics, and nuclear astrophysics. To extract as much information as possible from such observations, however, a deeper understanding of the highly non-linear merger events is nec- essary. Accurate studies of the merger of two neutron stars, or of a black hole and a neutron star, require complex numerical simulations capable of evolving Einstein’s equations of general relativity, and the general relativistic equations of magnetohydrodynamics and neutrino radiation transport. In this talk, I will review recent efforts to improve the accuracy and physical realism of these sim- ulations. I will discuss our current ability to model the properties of observable gravitational wave and electromagnetic signals, as well as important limitations of existing simulations that may still affect our ability to reliably extract information from some of these signals.
E-mail: [email protected]
Collaboration name: Simulating eXtreme Spacetimes
Funding source: NASA Grant 80NSSC18K0565
QCD, Hadron Spectroscopy, and Exotics / 369
A Lattice QCD Study of the ρ Resonance
Author: Luka Leskovec1
Co-authors: Andrew Pochinsky 2; Constantia Alexandrou 3; Gumaro Rendon 1; John W. Negele 2; Marcus Petschlies 4; Sergey Syritsyn 5; Srijit Paul 6; Stefan Meinel 1
1 University of Arizona 2 MIT 3 cComputation-based Science and Technology Research Center, The Cyprus Institute 4 HISKP, Bonn 5 SUNY, Stony Brook 6 Computation-based Science and Technology Research Center, The Cyprus Institute
Corresponding Author: [email protected]
We present a lattice QCD study of the ρ resonance with Nf = 2 + 1 clover fermions at a pion mass of approximately 320 MeV and lattice size 3.6 fm. We study two processes involving the ρ. The first process is scattering of two pions in P-wave with isospin 1 where by using the Luescher method we determine the strong scattering phase shift, from which we determine the ρ resonance mass and decay width Γ(ρ → ππ). The second process is the radiative transition πγ → ππ where we follow the Briceno-Hansen-Walker-Loud approach to determine the radiative transition amplitude in the invariant mass region near the ρ resonance and both space- and time-like momentum transfer. This allows us to determine the coupling between the ρ, the pion and the photon and the ρ radiative decay width.
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E-mail: [email protected]
Quark Matter and High Energy Heavy Ion Collisions / 269
Using Photon-Jet Analyses to Probe the QGP
Author: Saskia Mioduszewski1
1 Texas A&M University
Corresponding Author: [email protected]
RHIC at Brookhaven National Laboratory has been providing high energy heavy-ion collisions since the year 2000. Hard probes are often analyzed to study the properties of the matter created inheavy- ion collisions, by comparing the measurements to those in p + p collisions. Direct photons, those produced during the collision rather than from decays of hadrons, are particularly interesting be- cause they do not interact strongly and thus are not affected significantly by the medium. With the photon energy as a good approximation for the initial energy of the recoil parton (before interaction with the medium), the study of direct-photon-triggered away-side jets can give information about the energy loss of the recoil parton while traversing through the medium. In addition, it is useful to compare the suppression of jet-associated yields for direct-photon and neutral-pion triggers, in order to analyze the path-length and color-factor dependence of parton energy loss. Correlation measurements of direct-photon+hadron and neutral-pion+hadron will be presented and discussed. The status of an analysis of neutral-triggered reconstructed jets will also be discussed.
E-mail: [email protected]
Collaboration name: STAR Collaboration
Funding source: DOE Office of Science
NMNM / TSEI / 217
Neutrino Oscillations and Supernova Nucleosynthesis
Author: Akif Baha Balantekin1
1 University of Wisconsin-Madison
Corresponding Author: [email protected]
A good fraction of the heavier nuclei were formed in the rapid neutron capture (r-process) nucle- osynthesis scenario. Although an astrophysical site of the r-process is not yet identified, one ex- pects such sites to be associated with explosive phenomena since a large number of interactions are required to take place during a rather short time interval. Candidate sites include core-collapse supernovae and neutron-star mergers. The dynamics of these sites very much depend on neutrinos. In particular, the sheer number of neutrinos produced give rise to collective neutrino oscillations.
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Collective oscillations of neutrinos represent emergent nonlinear flavor evolution phenomena insti- gated by neutrino-neutrino interactions in astrophysical environments with sufficiently high neu- trino densities. In this talk the connection between neutrino collective oscillations, the dynamics of core-collapse supernovae, and the origin of chemical elements, especially those produced by the r-process nucleosynthesis, will be discussed.
E-mail: [email protected]
Funding source: NSF
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 341
Current Status of Very-Large-Basis Hamiltonian Diagonalizations for Nuclear Physics
Author: Calvin Johnson1
1 San Diego State University
Corresponding Author: [email protected]
Today there are a plethora of many-body techniques for calculating nuclear wave functions and matrix elements. I will review the status of that reliable workhorse, the interacting shell model, a.k.a. configuration-interaction methods, a.k.a. Hamiltonian diagonalization, and survey its advantages and disadvantages. With modern supercomputers one can tackle dimensions up to about 20 billion! I will discuss prospects for going even further, and what one hopes to learn.
E-mail: [email protected]
Funding source: DOE
Quark Matter and High Energy Heavy Ion Collisions / 37
Jet Mass for the Inclusive Jet Production at the LHC
Authors: Felix RingerNone; Kyle Lee1; Xiaohui Liu2; Zhongbo Kang3
1 Stony Brook University 2 Beijing Normal University 3 UCLA
Corresponding Author: [email protected]
In this talk, I will develop the theoretical framework of jet substructure measurements in the semi- inclusive jet production. The talk will mainly be focused on the recent work on jet mass measure- ments, with and without grooming, as a particular substructure of interest. I will discuss factoriza- tion, nonperturbative effects, and joint resummations of several classes of logarithmic corrections to
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all orders. Then I will discuss how both ungroomed and groomed results give very good agreement with the available data from the LHC.
E-mail: [email protected]
Parton and Gluon Distributions in Nucleons and Nuclei / 127
First Extraction of Transversity from Data on Lepton-Hadron Scat- tering and Hadronic Collisions
Author: Marco Radici1
1 INFN - Sezione di Pavia
Corresponding Author: [email protected]
We present the first extraction of the transversity distribution in the framework of collinear factoriza- tion based on the global analysis of pion-pair production in deep-inelastic scattering off transversely polarized targets and in proton-proton collisions with one transversely polarized proton. The extrac- tion relies on the knowledge of dihadron fragmentation functions, which are taken from the analysis of electron-positron annihilation data. For the first time, the chiral-odd transversity is extracted from a global analysis similar to what is usually done for the chiral-even spin averaged and helicity dis- tributions. The knowledge of transversity is important for detecting possible signals of newphysics in high-precision low-energy experiments.
E-mail: [email protected]
Particle and Nuclear Astrophysics / 167
Applications of Chiral Forces to Nuclear Matter and Neutron Stars
Author: Christian Drischler1 Co-authors: Achim Schwenk 2; Kai Hebeler 2
1 University of California, Berkeley and Lawrence Berkeley National Laboratory 2 Technische Universitaet Darmstadt
Corresponding Author: [email protected]
The equation of state of (isospin-)asymmetric nuclear matter is a key quantity for nuclear astro- physics. In this talk, we discuss recent progress of microscopic calculations based on nuclear forces derived within chiral effective field theory and many-body perturbation theory. We focus in particu- lar on applications of our improved normal-ordering method which enables the treatment of general three-body (3N) interactions starting from a partial-wave-decomposed form. Specifically, chiral 3N forces up to next-to-next-to-next-to-leading order (N3LO) are now accessible in partial-wave based frameworks. Applying these density-dependent effective two-body potentials to matter of arbitrary proton frac- tions, we show results for the equation of state, symmetry energy, incompressibility in conjugation
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with empirical parametrizations including the quadratic expansion in isospin-asymmetry. Further- more, we elaborate on constructing equations of state up to the high central densities typically real- ized in neutron stars. These can then be used to constrain, e.g., mass-radius relations. Remarkably tight constraints have been obtained with our state-of-the-art equations of state.
E-mail: [email protected]
QCD, Hadron Spectroscopy, and Exotics / 290
Measurement of Transition Form Factors at BESIII
Author: Christoph Florian Redmer1
1 Institute for Nuclear Physics, Johannes Gutenberg-University Mainz
Corresponding Author: [email protected]
The two-photon physics program of the BESIII Collaboration is mainly motivated by the large uncer- tainty of the contribution of hadronic light-by-light scattering (hLBL) to the Standard Model calcu- lations of the anomalous magnetic moment of the muon aµ. Here, electromagnetic transition form factors (TFF) can serve as experimental input to improve the calculations. Data acquired with the BESIII detector at center of mass energies from 3.77 to 4.6 GeV allow one to study the momentum dependence of TFFs of light mesons. The measurements are performed with a single-tag technique and indicate an unprecedented accuracy at momentum transfers below 3 GeV2, the region of highest 0 / importance for the calculations of aµ. In addition to the single pseudoscalar mesons π , η and η , the ππ system is studied. The information is not only vital as input to the recently developed dis- persive approaches to the hLBL calculations, but allows one to investigate TFFs of scalar and tensor resonances, and can provide further insights on the pion polarizabilities, as well as pion rescattering effects. Making use of the large statistics collected at BESIII, a first double-tagged measurement of the pion transition form factor has been started. It is the first step towards a model independent parameterization of the TFF of the π0. In this presentation the current status of the program will be discussed.
E-mail: [email protected]
Collaboration name: BESIII
Parton and Gluon Distributions in Nucleons and Nuclei / 142
Light Quark Fragmentation Studies at the B-Factories
Author: Anselm Vossen1
1 Duke University/JLab
Corresponding Author: [email protected]
The first generation B-factories Belle and Babar, located at KEK and SLAC, respectively, took e+e− annihilation data mostly near the Υ(4S) resonance. Due to the size of the datasets, Belle sampled a record breaking 1 ab−1, BaBar about half that, as well as the precision instrumentation and PID
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capabilities, these facilities have been an indispensable tool for the precision study of fragmenta- tion functions. Using data collected by Belle and BaBar, fragmentation functions can be extracted independently of the nucleon structure that has to be considered when analyzing data from deep- inelastic scattering or hadronic collisions. This is in particular valuable to determine thepolariza- tion dependence as well as transverse momentum dependence of fragmentation functions which are convoluted with poorly known quantities in SIDIS and hadronic collisions. Most recently, Belle performed precision measurements of di-hadron production as well as the first observation of trans- versely polarized hyperons in electron-positron annihilation. Beyond determining Fragmentation Functions, the study of hadronization allows us access to perturbative and non-perturbative QCD effects. This talk will present the latest results from the ongoing program of hadronization studiesat Belle and BaBar. It will also give an outlook towards related physics opportunities at Belle II, which will start data taking this year, sampling about 40 times the luminosity that Belle did.
E-mail: [email protected]
Quark Matter and High Energy Heavy Ion Collisions / 240
Heavy Flavor Jet Quenching at RHIC and LHC Energies
Author: Shanshan Cao1
1 Wayne State University
Corresponding Author: [email protected]
Heavy quarks serve as valuable probes of the QGP properties as well as the mass hierarchy of parton energy loss. In this talk, different model calculations of heavy quark energy loss inside the QGPare compared to each other within the same framework, from which we narrow down the systematical uncertainty of the extracted heavy quark transport coefficients from model to data comparison. In addition, a multi-stage evolution approach is introduced to heavy quark energy loss. This combines a rare-scattering multiple emission formalism at momenta large compared to the mass of heavyquarks and a single scattering induced emission formalism at momenta comparable to the mass. Thisnew approach reduces the difference of energy loss between charm and beauty quarks and simultaneously describes the nuclear modification of D and B mesons.
E-mail: [email protected]
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 317
Prospects for ab-initio Calculations of Nuclei with Quantum Com- puting
Author: Eugene Dumitrescu1
Co-authors: Alex McCaskey 1; David Dean 1; Gaute Hagen 1; Gustav Jansen 1; Pavel Lougovski 1; Raphael Pooser 1; Thomas Papenbrock 2; Titus Morris 1
1 ORNL 2 UTK, ORNL
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Corresponding Author: [email protected]
In this talk, we report on the first nuclear physics computations performed on quantum computers. Addressing superconducting qubits provided by IBM and Rigetti via cloud servers, we calculate the binding energy of the deuteron to within a few percents. This is achieved by implementing the hybrid classical-quantum variational eigensolver algorithm with a low-depth version of the unitary coupled-cluster ansatz. I will discuss our results, experience, and future directions within the context of the near term noisy quantum computing paradigm.
E-mail: [email protected]
Funding source: DOE ASCR QCAT, DOE ASCR Testbed Pathfinder, ORNL LDRD
Particle and Nuclear Astrophysics / 305
Studying Lanthanide Production in r-Process Nucleosynthesis
Author: Nicole Vassh1
Co-authors: Gail McLaughlin 2; Matthew Mumpower 3; Rebecca Surman 1
1 University of Notre Dame 2 North Carolina State University 3 Los Alamos National Lab
Corresponding Author: [email protected]
The recent observations of the GW170817 electromagnetic counterpart suggest lanthanides were produced in this neutron star merger event. Lanthanide production in heavy element nucleosynthe- sis is subject to large uncertainties from nuclear physics and astrophysics unknowns. Specifically, the rare-earth abundance peak, a feature of enhanced lanthanide production at A ∼ 164 seen in the solar r-process residuals, is not robustly produced in r-process calculations when astrophysical and nuclear physics inputs are varied. One possibility which will be discussed is that the fission fragment distributions of heavy, neutron-rich nuclei dump material directly into the peak region at late times. Alternatively, the proposed dynamical mechanism of peak formation requires the r-process path to encounter a nuclear physics feature in the rare-earth region which may be within reach of nuclear physics experiments performed at, for example, the CPT at CARIBU and the upcoming FRIB. To max- imize what can be learned regarding nucleosynthesis from such precision measurements, we employ Markov Chain Monte Carlo studies to “reverse engineer” the nuclear masses capable of producing a peak compatible with the observed solar r-process abundances given different sets of astrophysical conditions. Here I will present the latest results for the masses found to produce the rare-earth peak in a low entropy accretion disk wind scenario, and compare directly with recent mass measurements from the CPT at CARIBU. Such collaborative efforts between theory and experiment could soon be in a position to make definitive statements regarding the mechanism of rare-earth peak formation and thus the astrophysical site of the r-process.
E-mail: [email protected]
NMNM / TSEI / 151
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Collective Neutrino Oscillations in the Presence of Collisions
Author: Shashank Shalgar1 Co-authors: Mark Paris 1; Vincenzo Cirigliano 1
1 Los Alamos National Laboratory
Corresponding Author: [email protected]
In dense astrophysical environments, the evolution of neutrino flavor is non-linear which can lead to many interesting phenomena. However, this non-linear evolution of neutrino flavor also called the “collective neutrino oscillations” is only beginning to be understood, especially in conjunction with collisions. I will discuss the effect of neutrino back-scattering in the interior of a core-collapse supernova using a simplified model.
E-mail: [email protected]
QCD, Hadron Spectroscopy, and Exotics / 126
Unitary Reaction Models and PWA Formalisms
Author: Alessandro Pilloni1
1 Jefferson Lab
Corresponding Author: [email protected]
Last decade witnessed a proliferation of new exotic states, in particular in the heavy quark sector. A comprehensive picture of all these states remains an unsettled topic. We discuss our recent devel- opments in amplitude analysis, in particular related to the identification of exotic states.
E-mail: [email protected]
NMNM / TSEI / 340
Neutrino Flavor Transformation and the Cosmic Lepton Asym- metry
Author: Luke Johns1 Co-authors: George Fuller 1; Mark Paris 2; Mattia Mina 3; Vincenzo Cirigliano 2
1 UC San Diego 2 Los Alamos National Lab 3 University of Oslo
Corresponding Author: [email protected]
Observational constraints permit a cosmic lepton asymmetry that is orders of magnitude larger than its baryonic counterpart, a possibility of great relevance for leptogenesis, sterile neutrino dark matter,
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and the flavor evolution of Standard Model neutrinos. It is this last connection that wefocuson here: the flavor states of neutrinos in the early universe are coupled to each other, through neutrino- neutrino forward scattering, in a way that depends on the lepton asymmetry. We identify the regimes of flavor transformation that are permitted by constraints and discuss possible ramifications forBig Bang nucleosynthesis. Incidentally, the regime preferred by resonant production of sterile neutrino dark matter is marked by a new flavor-transformation phenomenon, which we analogize to thereal- life toy known as a rattleback.
E-mail: [email protected]
Nuclear Forces and Structure, NN Correlations, and Medium Effects / 278
Weakly Bound Neutron-Rich Nuclei and Cosmic Phenomena
Author: Ushasi Datta1
1 Saha Institute Of Nuclear Physics
Corresponding Author: [email protected]
Understanding the limits of existence of nuclei is an open problem in fundamental science. Lack of understanding of the nucleon-nucleon interaction in nuclei with unusual neutron to proton ratio is one of the main reasons. Thus it is an urgent problem to find out the missing link of unified theory by studying single particle and bulk properties of the nuclei with large neutron proton asymmetry. The shell gaps at magic numbers are the characteristics of a mean nuclear field. The unambiguousin- formation on detailed components of the ground-state wave-function along with quantum numbers of the valence neutron of the nuclei can be obtained from the measurement of threshold strength along with the γ-ray spectra following Coulomb breakup. The shape of this threshold strength is a finger-print of the quantum numbers of the nucleon. We investigated the ground-state proper- ties of neutron-rich Na, Mg, Al nuclei around N ∼ 20 using this method at GSI, Darmstadt. Very clear evidences have been observed for melting and merging of long cherished magic shell gaps at N = 20, 28. The nuclei around the drip-line are short-lived but surprisingly, evanescent rare isotopes imprint their existence in stellar explosive scenarios (r-process etc.). Due to their fleeting existence, indirect measurements are often the only possible access to the information which isa valuable input to the model for star evaluation process. Some valuable bulk properties of the neutron- rich nuclei play a key role in understanding cosmic phenomena. I shall discuss in this presentation our achievements related to the above mentioned facts.
E-mail: [email protected]
Collaboration name: S306 - LAND FRS collaboration
Funding source: Alexander Von Humboldt fellowship grants, DAE Govt. Of India
Parton and Gluon Distributions in Nucleons and Nuclei / 232
Achievements and Open Issues in the Determination of Fragmen- tation Functions
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Author: Emanuele Roberto Nocera1
1 Higgs Centre for Theoretical Physics
Corresponding Author: [email protected]
I review recent progress in the determination of the collinear fragmentation functions (FFs). I focus on the role of new data, improved theory and increased methodological sophistication in recent global QCD fits of light charged hadron FFs. I outline issues that are still open, and I discuss possible ways to assess the interplay between FFs and parton distribution functions (PDFs) in semi-inclusive observables.
E-mail: [email protected]
Particle and Nuclear Astrophysics / 173
R-Process Experiments with Unstable Isotope Beams
Author: Alfredo Estrade1
1 Central Michigan University
Corresponding Author: [email protected]
The measurement of elemental abundances in ultra-metal poor stars over the last decade, andthe recent observation of a neutron-star merger event, are crucial steps towards solving one of the out- standing questions in nuclear astrophysics: the synthesis of the heaviest elements during the rapid neutron-capture process (r-process). However, and in spite of steady progress in the experimental and theoretical fronts, the lack of reliable nuclear data for most isotopes involved in the r-process still represents a significant hurdle to make precise comparisons of astrophysical theories with astro- nomical observations. Improving nuclear data for the r-process is one of the main motivations for the development of a new generation of radioactive ion beam laboratories specifically designed to be able to reach very unstable isotopes. I will review current efforts on r-process experiments with radioactive ion beams, discussing examples of measurements of nuclear masses and decay properties of neutron-rich isotopes at the National Superconducting Cyclotron Laboratory (NSCL) in the US, and the Radioactive Ion Beam Factory (RIBF) of RIKEN in Japan, which our group is involved with. I will also present an outlook of the exciting new experimental opportunities that will be offered by the Facility for Rare Isotope Beams (FRIB) under development at Michigan State University.
E-mail: [email protected]
Quark Matter and High Energy Heavy Ion Collisions / 112
Energy and System Dependent Heavy Flavor Measurements at PHENIX at RHIC
Author: Xuan Li1
1 Los Alamos National Lab
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Corresponding Author: [email protected]
Heavy flavor and quarkonium production are important hard probes to test Quantum Chromody- namics (QCD) and measure the properties of the Quark Gluon Plasma (QGP) created in high energy heavy ion collisions. Unlike LHC experiments, heavy flavor production at RHIC has its unique kine- matic region and different production mechanisms. The PHENIX experiment has collected large data sets of 200/510 GeV p+p; 200 GeV p+Al, p+Au, Cu+Au and Au+Au collisions, which allow us to study the energy dependence of the heavy flavor production, the heavy quark energy loss incold nuclear medium and hot QGP. In this talk, we will present latest PHENIX hidden and open heavy flavor results in different collision systems including the J/ψ cross section and nuclear modification 3 factor (RAA) in 200 GeV p+Al, p+Au and He+Au data to study the cold nuclear medium effects on the charm quark production; the energy dependent production of forward J/ψ from B meson de- cay and bottom cross section measured in p+p collisions which improves the understanding of the heavy flavor production√ mechanism; the non-prompt J/ψ nuclear modification factor measurement in Cu+Au collisions at sNN = 200 GeV and the charm and bottom decayed single electron nuclear modification factor measurements in 200 GeV Au+Au collisions. We will also show the prospectsfor ongoing PHENIX central and forward rapidity open heavy flavor measurements in 200 GeV Au+Au collisions.
E-mail: [email protected]
Collaboration name: PHENIX
Funding source: DOE Office of Science
Poster Session - Board: 12 / 199
New Techniques in the ANITA-IV Analysis
Author: Andrew Ludwig1
1 University of Chicago
Corresponding Author: [email protected]
The ANtarctic Impulsive Transient Antenna (ANITA) is a NASA balloon-borne radio (180–1200 MHz) telescope sensitive both to impulsive Askaryan radio emission from ultra-high energy (> 1018 eV) neutrino-initiated showers in the Antarctic ice sheet, as well as geomagnetically-induced radio emis- sion from extensive air showers (EAS) initiated by cosmic rays or upward-going tau leptons that are created by tau neutrino interactions in the Earth. The fourth flight of ANITA completed Dec29, 2016. I will report on the ongoing analysis of ANITA-IV data, with an emphasis on new techniques to reduce backgrounds from anthropogenic radio signals.
E-mail: [email protected]
Collaboration name: ANITA
Poster Session - Board: 14 / 339
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Neutrino Burst-Generated Gravitational Radiation from Collaps- ing Supermassive Stars
Author: Jung-Tsung Li1 Co-authors: Chad Kishimoto 2; George Fuller 3
1 UC San Diego 2 University of San Diego 3 University of California, San Diego
Corresponding Author: [email protected]
We estimate the gravitational radiation signature of the e+e− annihilation-driven neutrino burst ac- companying the asymmetric collapse of an initially hydrostatic, radiation-dominated supermassive 4 object suffering the Feynman-Chandrasekhar instability. An object with a mass 5 × 10 Msun < 5 M < 5 × 10 Msun, with primordial metallicity, is an optimal case with respect to the fraction of its rest mass emitted in neutrinos as it collapses to a black hole: lower initial mass objects willbe subject to scattering-induced neutrino trapping and consequently lower efficiency in this modeof gravitational radiation generation; while higher masses will not get hot enough to radiate signifi- cant neutrino energy before producing a black hole. The optimal case collapse will radiate several percent of the star’s rest mass in neutrinos and, with an assumed small asymmetry in temperature at peak neutrino production, produces a characteristic linear memory gravitational wave burst sig- nature. The timescale for this signature, depending on redshift, is ∼1 s to 10 s, optimal for proposed gravitational wave observatories like DECIGO. Using the response of that detector, and requiring a 4 signal-to-noise ratio SNR > 5, we estimate that collapse of a 5 × 10 Msun supermassive star could produce a neutrino burst-generated gravitational radiation signature detectable to redshift z < 7. With the envisioned ultimate DECIGO design sensitivity, we estimate that the linear memory signal from these events could be detectable with SNR > 5 to z < 13.
E-mail: [email protected]
Poster Session - Board: 6 / 333
Search for Anomalous Decay of the Free Neutron Using the UCNA Experiment: n → χ + e+ + e−
Author: Xuan Sun1
1 California Institute of Technology
Corresponding Author: [email protected]
The neutron lifetime is currently measured by two different types of experiments: ‘beam’ and‘bot- tle’. These two measurement techniques have a 4σ discrepancy in measured lifetime. A recent paper proposes to resolve this issue by introducing a dark sector particle, χ, that could offer an alternative decay channel for the neutron. This decay channel could resolve the discrepancy since beam experi- ments measure final decay products and bottle experiments measure remaining neutron population. The proposed theory allows for an e+e− pair produced in addition to a hypothesized χ. The UCNA (Ultra Cold Neutron Asymmetry) experiment has sensitivity to this particular decay signature, since it would appear as a mono-energetic peak over a standard β decay spectrum. In this experiment, polarized neutrons decay in a trap and their charged products are guided by a 1 T magnetic field to detectors on either side, thus effectively giving 4π detection coverage. Timing information and energy reconstruction is done on each β decay. We use results from the UCNA experiment’s 2012– 2013 dataset to set limits on the branching fraction of this decay channel. In the case of a candidate e+e− pair, the summed reconstructed energy from both sides is used to set limits on the branch- ing ratio of this decay channel, as a function of the mass of the hypothesized χ. We present an
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overview of the calibration process and the limits on a neutron dark decay channel set by the UCNA experiment.
E-mail: [email protected]
Collaboration name: UCNA Collaboration
Funding source: This work is supported in part by the US Department of Energy, Office of Nuclear Physics (DE-FG02- 08ER41557, DE-SC0014622, DE-FG02-97ER41042) and the National Science Foundation (1002814, 1005233, 1205977, 1306997 1307426, 1506459, and 1615153).
Poster Session - Board: 1 / 91
A New Symmetry of Electroweak Lagrangian
Author: Dmytro Ptashynskyi1 Co-authors: Kyrylo Merkotan 1; Nataliia Chudak 1; Oleksii Potiienko 1
1 Odessa National Polytechnic University
Corresponding Author: [email protected]
Problems of the Standard Model, associated with the introduction of non-gauge interactions and with the introduction of an electromagnetic field as a linear combination of fields on which various gauge groups are implemented, are analyzed. It is noticed that the existing model contains U(1) – phase uncertainty of the matrix elements of the raising and lowering generators of the SU(2) group. This uncertainty creates the condition for the additional local U(1) – symmetry of the Standard Model Lagrangian with respect to the choice of various equivalent generator representations of the SU(2) group. Such symmetry is provided by a gauge electromagnetic field introduction. In this case, due to the different action of the raising and lowering generators on the fields of each generation ofleptons and quarks, these fields interact with the electromagnetic field in different ways.
E-mail: [email protected]
Poster Session - Board: 17 / 379
Visualizing Invisible Dark Matter Annihilation with the CMB and Matter Power Spectrum
Author: Ran Huo1
1 UC Riverside
Corresponding Author: [email protected]
We study the cosmological signatures of Invisibly Annihilating Dark Matter (IAnDM) where DM annihilates into dark radiation particles that are decoupled from the Standard Model (SM). In a large class of dark sector models such invisible annihilation determines the relic abundance of DM via
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dark thermal freezeout. We demonstrate that IAnDM may reveal itself through observable, novel signatures that are correlated: scale-dependent ∆Neff (number of extra effective neutrinos) in the Cosmic Microwave Background (CMB) spectrum due to DM residual annihilation, while the phase of acoustic peaks shift towards the opposite direction relative to that due to SM neutrinos, resembling the effect due to scattering (fluid-like) thermal dark radiation. In addition, IAnDM inducesmodi- fications to the matter power spectrum that resemble yet are distinct from that due towarmdark matter. Current data is sensitive to IAnDM with masses upto ∼ 200 keV, while future observations will improve the reach, especially if the late-time DM annihilation cross-section is enhanced relative to the standard thermal value, which can be realized in a variety of scenarios.
E-mail: [email protected]
Poster Session - Board: 16 / 378
In-Ice Phased Antenna Arrays for Radiodetection of Energetic Neutrinos
Author: Cosmin Deaconu1
1 UChicago / KICP
Corresponding Author: [email protected]
Experiments such as the Askaryan Radio Array (ARA) use in-ice antennas to detect the Askaryan radio emission produced by interactions of ultra-high-energy neutrinos in glacial ice. A prototype phased array trigger was recently deployed with an ARA station this austral summer (December 2017–January 2018). The phased array trigger forms beams from multiple antennas in realtime to reduce the electric field required to trigger the detector. This poster will report on the design, operation, and physics potential of the prototype.
E-mail: [email protected]
Collaboration name: Askaryan Radio Array
Poster Session - Board: 2 / 370
Composite Higgs from Mass-Split Models
Author: Oliver Witzel1
1 University of Colorado Boulder
Corresponding Author: [email protected]
Beyond Standard Model theories describing the electro-weak sector must exhibit a large separation of scales (or “walking”) to account for a light, 125 GeV Higgs boson and the fact that so far no other resonances have been observed. Large separation of scales arises naturally and in a tunable manner in mass-split models that are built on a conformal fixed point in the ultraviolet. Splitting the
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fermion masses into “light” (massless) and “heavy” flavors, the system shows conformal behavior in the ultraviolet but is chirally broken in the infrared. Due to the presence of a conformal fixed point, such chirally broken systems show hyperscaling and have a highly constrained resonance spectrum that is significantly different from the QCD spectrum. We highlight most characteristic features presenting numerical data obtained from dynamical sim- ulations of an SU(3) gauge theory with four light and eight heavy flavors. In addition, we give an outlook on ongoing work simulating an SU(3) gauge theory with four light and six heavy flavors us- ing a set-up well suited to explore e.g. mass-generation of Standard Model fermions via four-fermion interactions or partial compositeness.
E-mail: [email protected]
Poster Session - Board: 4 / 373
Demonstration of 3D Micro-Power Readout for Liquid Argon Time Projection Chambers
Author: Daniel DwyerNone
Corresponding Author: [email protected]
We report the demonstration of a micro-power sensor designed for three-dimensional ionization charge detection and digital readout of liquid argon time projection chambers (LArTPCs). 3D readout is achieved using a custom-designed 32-channel system-on-a-chip ASIC (LArPix-v1), manufactured in 180 nm bulk CMOS, to uniquely instrument each pad in a charge-sensitive pad sensor array. Using a prototype sensor with 3 mm spacing between pads, we demonstrate low-noise (< 500 e− equiva- lent) low-power (< 100 µW/ch) ionization signal detection and readout of cosmic ray interactions in two LArTPCs with drift distances of 10 to 60 cm. This demonstration of 3D micro-power readout overcomes a critical technical obstacle for operation of LArTPCs in high-occupancy environments, such as the near detector site of the Deep Underground Neutrino Experiment (DUNE).
E-mail: [email protected]
Funding source: DOE-OHEP contract number DE-AC02-05CH11231
Poster Session - Board: 3 / 372
Results from MICE: the Muon Ionization Cooling Experiment
Author: Daniel Kaplan1
1 Illinois Institute of Technology
Corresponding Author: [email protected]
The Muon Ionization Cooling Experiment (MICE) is a feasibility demonstration of a crucial emittance- reduction technique for future muon colliders and neutrino factories. MICE has studied the effect of ionization energy loss in low-Z absorber materials on a muon beam. Muons were focussed on
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lithium hydride and liquid hydrogen absorbers using a large-aperture solenoid. Particle tracking and identification detectors upstream and downstream of the absorber enabled the reconstruction of the phase-space coordinates of individual muons. The evolution of beam emittance was measured by studying the properties of ensembles of single muons using muon beams with varying input emit- tances and momenta. Data taken in 2016 and 2017 are currently being analyzed. The current status and most recent results are presented.
E-mail: [email protected]
Collaboration name: MICE Collaboration
Funding source: DOE
Poster Session - Board: 10 / 375
Phases of UV Dark Matter Freeze In
Author: Lindsay Forestell1 Co-author: David Morrissey 2
1 TRIUMF, UBC 2 TRIUMF
Corresponding Author: [email protected]
WIMPs have not yet been seen via direct detection, indirect detection, or in collider searches. Perhaps now is a good time to consider alternate mechanisms for DM production. We investigate a new production mechanism for dark matter that consists of both a non-thermal freeze-in component as well as a hidden sector freeze-out.
E-mail: [email protected]
Poster Session - Board: 15 / 374
Possibilities for Underground Physics in the Pyhäsalmi Mine
Author: Wladyslaw Henryk Trzaska1
1 University of Jyvaskyla
Corresponding Author: [email protected]
The underground mining in the Pyhäsalmi mine, Finland, is coming to an end in approximately 18 months after nearly 60 years of operation. The infrastructure of the mine is in excellent condition, including 1400-metre long vertical elevator shaft and 11-km long truck-size decline for transporta- tion, large underground storage and service halls, offices, restaurant and modern communication services.
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An organization called Callio has been founded (https://callio.info) to maintain and operate the un- derground premises after the closure of the mine. There exists currently one dedicated laboratory hall (Lab2) for physics experiments at the deepest location of the mine. The overburden of 4100 mwe offers great possibilities for physics experiments requiring maximum shielding from cosmic muons. New excavations are possible. Currently there are two physics experiments running in the mine. EMMA is studying the composi- tion of cosmic rays at the knee region. The array of 11 stations is situated at the depth of 75m.The C14 experiment is situated in the laboratory hall Lab2. It is a small-size low-background set-up to map the concentration of carbon-14 in liquid scintillators.
E-mail: [email protected]
Poster Session - Board: 7 / 376
Progress Towards Measurement of the Nuclear Anapole Moment of Ba-137 Using BaF Molecules
Author: Sidney Cahn1
Co-authors: David DeMille 1; Emine Altuntas 2; Jai-Min Choi 3; Jeffrey Ammon 4
1 Yale University 2 NIST 3 Chonbuk National University 4 MIT Lincoln Lab
Corresponding Author: [email protected]
Nuclear spin dependent parity violation (NSD-PV) effects in atoms and molecules arise from Z0 boson exchange between electrons and the nucleus, and from the magnetic interaction between electrons and the parity-violating nuclear anapole moment. It has been proposed to study NSD- PV effects using an enhancement of the observable effect in diatomic molecules. Here, wedemon- strate measurements of this type with sensitivity to NSD-PV effects surpassing that of any previous atomic PV measurement, using the test system 138Ba19F. With ∼168 hours of data, we measure the matrix element, W , of the NSD-PV interaction with combined statistical and systematic uncertainty δW < 0.7 Hz. The sensitivity we demonstrate would be sufficient to measure NSD-PV effectsof the size anticipated across a wide range of nuclei. We describe the details of our method and future improvements, including an extensive study of systematic errors associated with our technique, and show that these can be controlled at least at the level of the present statistical sensitivity.
E-mail: [email protected]
Collaboration name: ZOMBIES
Funding source: NSF
Poster Session - Board: 8 / 12
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Using X-Ray Femtoscope and X-Ray Telescope We Verified that Dark Matter Behaves as Catalyst or as Inhibitor of the Nuclear Reactions
Author: Edward Jimenez1
1 Chemistry Engineering Faculty
Corresponding Author: [email protected]
The X-ray femtoscope predictions: 1) Dark matter has resonances for the chemical elements Cr, Xe and Tm, which corresponds tothe forces that gave the name to the WIMPs with adjustment of R2 = 0.996. 2) Navier Stokes equations and solutions for the atomic nucleus are robust, since they naturally deliver the values of the following constants: neutron radius rn = 0.843 fm, measured for the first time, nuclear viscosity 9.77 × 1022 ≤ ≤ 1.08 × 1023 fm2/s and Rydberg constant. 3) Dark matter produce nuclear catalysis. The X-ray telescope proofs: 1) Fluorescent dark matter has resonances in emission and absorption at low X-ray energies (3.5 keV). 2) Gravity appears indirectly through the first analytical solution to the millennium problem, associ- ated with the Navier Stokes (NS) equations, which govern the stability of the incompressible nuclear fluid, and which have the range of magnitude of the gravity 10−30. 3) Dark matter interacts with baryonic matter as a catalyst or as an inhibitor, so it isnotconsumed in the nuclear reaction for Chandra X-Ray Galaxy Clusters at z < 1.4.
E-mail: [email protected]
Poster Session - Board: 11 / 15
Lessons from HAWC PWNe Observations: The Diffusion Con- stant is Not a Constant; Pulsars Remain the Likeliest Sources of the Anomalous Positron Fraction; Cosmic Rays are Trapped for Long Periods of Time in Pockets of Inefficient Diffusion
Author: Stefano Profumo1 Co-authors: Javier Reynosa-Cordova 1; Maya Silverman 2; Nicholas Omahen 2
1 Santa Cruz Institute for Particle Physics 2 University of California, Santa Cruz
Corresponding Author: [email protected]
Recent TeV observations of nearby pulsars with the HAWC telescope have been interpreted as ev- idence that diffusion of high-energy electrons and positrons within pulsar wind nebulae is highly inefficient compared to the rest of the interstellar medium. If the diffusion coefficient welloutside the nebula is close to the value inferred for the region inside the nebula, high-energy electrons and positrons produced by the two observed pulsars could not contribute significantly to the local measured cosmic-ray flux. The HAWC collaboration thus concluded that, under the assumption of isotropic and homogeneous diffusion, the two pulsars are ruled out as sources of the anomalous high-energy positron flux. Here, we argue that since the diffusion coefficient is likely notspatially homogeneous, the assumption leading to such conclusion is flawed. We solve the diffusion equation with a radially dependent diffusion coefficient, and show that the pulsars observed byHAWCpro- duce potentially perfect matches to the observed high-energy positron fluxes. We also study the implications of inefficient diffusion within pulsar wind nebulae on Galactic scales, and showthat
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cosmic rays are likely to have very long residence times in regions of inefficient diffusion. We de- scribe how this prediction can be tested with studies of the diffuse Galactic emission.
E-mail: [email protected]
Funding source: This work was partially funded by a UCMEXUS-CONACYT collaborative project.
Poster Session - Board: 9 / 368
Introducing the SnowBall Chamber, Supercooled Water for Dark Matter and Neutron Detection
Author: Matthew Szydagis1
1 U Albany
We have all heard of the cloud and bubble chambers of course, and the latter in the context of direct WIMP dark matter detection even. However, no one has explored a third phase transition, into solid, until now that is. This poster will introduce the snowball chamber, which utilizes a supercooled liquid, just purified water in the prototype. An incoming particle triggers nucleation in theliquid, forming a solid. We will present the world’s first definitive evidence that radiation can trigger freez- ing in metastable cold water, an effect never before observed, and in particular share AmBe neutron source calibration data, wherein multiple nucleation sites could be observed during the neutron source runs, another world first, making our device act just like a reverse bubble chamber. Because the reaction is exothermic, not endothermic as in a bubble chamber, the energy threshold should be lower, perfect for sub-GeV dark matter searches, for which we will show the measured gamma discrimination, high as in a bubble chamber, and the projected sensitivity, showing our new tech- nology reaching the neutrino floor, with a smaller, more cost-effective detector than many ofthe competing new technologies. The crystallization may even have directionality which we will show preliminary evidence for: this would mean higher-density directional detectors than in gas, capable of not just reaching the neutrino floor but punching through it, at masses less thanc 10GeV/ 2 at least.
E-mail: [email protected]
Collaboration name: SnowBall
Funding source: University at Albany Presidential Innovation Fund for Research and Scholarship (https://www.albany.edu/presidential- innovation-fund/index.php)
Poster Session - Board: 5 / 56
Search for a Nuclear Magnetic Quadrupole Moment in 173Yb
Author: Nick Hutzler1 Co-authors: Arian Jadbabaie 1; Avikar Periwal 1; Nick Pilgram 1
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1 Caltech
Corresponding Author: [email protected]
The fact that the universe is made entirely out of matter, and contains no free anti-matter, hasno physical explanation. While we cannot currently say what process created the matter in the universe, we know that it must violate a number of fundamental symmetries, including those that forbid the existence of certain electromagnetic moments of fundamental particles. We can search for signatures of these electromagnetic moments via precision measurements in polar molecules, whose extremely large internal electromagnetic fields can significantly amplify these moments. These effects would arise from physics beyond the Standard Model, which enables tabletop searches for new, symmetry- violating particles and forces. With modern, quantum science techniques to control polar molecules, these searches can currently reach into the TeV scale, and offer a route to the PeV scale through ad- vanced cooling and trapping techniques. I will discuss a new cryogenic molecular beam experiment being developed at Caltech to use polyatomic 173YbOH to search for hadronic CP violation via a nuclear magnetic quadrupole moment, which are sensitive to a wide variety of CP-violating sources beyond the Standard Model.
E-mail: [email protected]
Funding source: Heising-Simons Foundation
Poster Session - Board: 13 / 226
Half-Lives of the Neutron-Rich N = 82 Isotopes 130Cd and 131In
Author: Ryan Dunlop1
1 University of Guelph
Corresponding Author: [email protected]
Half-lives of N = 82 nuclei below doubly-magic 132Sn are key input parameters for calculations of any astrophysical r-process scenario and play an important role in the formation and shape of the second r-process abundance peak. In the past, shell-model calculations of neutron-rich nuclei near the N = 82 neutron shell closure that are not yet experimentally accessible have been performed by adjusting the quenching of the Gamow-Teller (GT) operator to reproduce the half-life of 130Cd [1]. The calculated half-lives of other nuclei in the region are known to be systematically toolong. Recently, a shorter half-life for 130Cd was reported [2,3]. A re-scaling of the GT quenching to the new 130Cd half-life by a constant factor resolved the discrepancy [2,3]. However, this GT rescaling creates a new discrepancy in the calculated half-life of 131In. The half-life measurement of 131In is complicated due to the presence of three known β-decaying states with similar half-lives, making photopeak gating an ideal method to measure each of these half-lives. In this talk, the half-lives of 130Cd and 131In, as well as the spectroscopy of the β and β−n decay of 131In measured using the GRIFFIN γ-ray spectrometer at TRIUMF will be presented. [1] M. Hannawald et al., Nucl. Phys. A 688, 578 (2001) [2] R. Dunlop et al., Phys. Rev. C 93, 062801(R) (2016) [3] G. Lorusso et al., Phys. Rev. Lett. 114, 192501 (2015)
E-mail: [email protected]
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Collaboration name: GRIFFIN Collaboration
Plenary 7 / 84
Recent Progress on Double Beta Decay and Latest GERDA Re- sults
Author: Karl Tasso Knoepfle1
1 MPI Kernphysik
Corresponding Author: [email protected]
The definitive observation of neutrinoless double beta decay, (A,Z) → (A, Z+2) + 2e−, would have two profound implications: it would establish that neutrinos are Majorana fermions and reveal that lepton number is not conserved. This relevance has caused a worldwide search for this process, using various isotopes and detector technologies. I will present in my talk a review of the overall experimental progress in the field, and describe in more detail the latest results from the Germanium Detector Array (GERDA) experiment that searches in the Gran Sasso underground laboratory LNGS for the neutrinoless double beta decay of 76Ge. I will conclude with a discussion of the prospects for the future.
E-mail: [email protected]
Collaboration name: GERDA Collaboration
Plenary 7 / 74
Neutrino Oscillations
Author: Pedro Machado1
1 Fermilab
Corresponding Author: [email protected]
In this talk I will review the current status of neutrino oscillations. Emphasis will be given to the determination of neutrino mass hierarchy and CP violating phase. I will also quickly summarize the progress towards LBNE and the status of short baseline anomalies.
E-mail: [email protected]
Plenary 7 / 105
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Fingerprints of the First Stars in the Sky-Averaged Radio Spec- trum
Author: Raul Monsalve1
Co-authors: Alan Rogers 2; Judd Bowman 3; Nivedita Mahesh 3; Thomas Mozdzen 3
1 Colorado / McGill 2 Haystack Observatory 3 ASU
Corresponding Author: [email protected]
The period of the Universe known as Cosmic Dawn is marked by the formation of the firststars, before 100 million years after the Big Bang. These stars formed due to the gravitational collapse of primordial neutral hydrogen gas left over after the release of the cosmic microwave background (CMB). The ultraviolet radiation that these stars emitted penetrated the atoms of the surrounding neutral hydrogen gas, which caused the gas to absorb photons from the CMB. This alteration of the hydrogen gas should be observable today as an absorption feature in the radio spectrum at frequencies below 200 MHz. In this talk I will describe the detection by the EDGES experiment of an absorption feature in the sky-averaged spectrum centered at 78 MHz. This feature implies absorption of the microwave background by the hydrogen gas approximately 180 million years after the Big Bang, which is broadly consistent with predictions. However, the amplitude of the observed signal is ∼0.5 K, twice as large as expected. New theories have already been proposed that try to explain this deeper absorption. Two leading options correspond to a higher radiation background than previously thought during Cosmic Dawn, and a new form of interaction between the hydrogen gas with the colder dark matter. I will review the theory of this cosmological radio measurement and describe the EDGES experiment, including the instruments used for the detection and the data analysis.
E-mail: [email protected]
Collaboration name: EDGES Collaboration
Plenary 8 / 233
The EMC Effect – New Insights and Future Studies
Author: David Gaskell1
1 Jefferson Lab
Corresponding Author: [email protected]
More than 30 years ago, the European Muon Collaboration provided evidence that quark distribu- tions are modified in nuclei as compared to the free nucleon. The EMC Effect has beenasubject of investigation, both experimentally and theoretically, ever since. To date, there is no universally accepted explanation of the EMC Effect, but recent results have given some exciting clues as toits possible origins. This presentation will focus on recent measurements of the EMC Effect and the future programof measurements of the nuclear dependence of quark distributions. Some of these measurements aim to explore the EMC Effect via measurements of a number of as-yet unmeasured nuclei, while others will attempt to gain insight via new observables, predicted to have significant nuclear effectsthat will provide sensitivity to particular models of the EMC Effect.
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E-mail: [email protected]
Plenary 8 / 78
Short-Range Correlations in Nuclei
Author: Alexandra Gade1
1 NSCL/MSU
Corresponding Author: [email protected]
The nuclear shell model pictures deeply bound nucleons as being in fully occupied states.Atand above the Fermi surface, configuration mixing then leads to occupancies that gradually decrease to zero. This picture is modified in an important way by several correlation effects that areabsent from, or are described only approximately by, effective-interaction theories, such as the shell model. These correlations arise from short-range, soft-core, and tensor nucleon-nucleon interactions and from longer-range couplings involving low-lying and giant resonance collective excitations. Over the years, a variety of experimental studies using different probes, including a set of complementary nuclear reactions, have been interpreted to reveal signatures of such correlation effects, including short-range correlations. The availability of rare-isotope beams has allowed expanding such ex- plorations towards the extremes of isospin. This presentation will summarize the present status, challenges, and open questions.
E-mail: [email protected]
Plenary 8 / 234
Light-Cone Physics and Large-Momentum Effective Field Theory
Authors: Xiangdong Ji1; Yong Zhao2
1 U. Maryland 2 Massachusetts Institute of Technology
Corresponding Authors: [email protected], [email protected]
In high-energy scattering, the physics of hadrons can be described by various light-cone correlation functions, which include parton distributions, generalized parton distributions, distribution ampli- tudes, as well as the so-called light-cone wave functions. Because of their explicit time-dependence, these quantities cannot be calculated directly from QCD using Monte Carlo simulations. For years, theorists have resorted to analytical approaches such as light-cone quantization, with little success. In this talk, I will introduce large-momentum effective field theory as a novel approach to extract light-cone correlation functions from Euclidean observables calculable in lattice QCD. Some of re- cent successful examples are discussed, including the gluon helicity contribution to the proton spin and isovector parton densities.
E-mail: [email protected]
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Plenary 8 / 380
The Structure of the Nucleon
Author: Matthias Grosse Perdekamp1
1 UIUC, Department of Physics
Corresponding Author: [email protected]
The nucleon is a complex composite object. Its structure, the dynamics of its constituents andits mass presently cannot be calculated from Quantum Chromo Dynamics without simplifying model assumptions. Momentum- and spin-dependent distributions of quarks and gluons have been deter- mined with increasing precision through 50 years of deep inelastic lepton-proton scattering exper- iments and the QCD analysis of 30 years of high energy proton-proton collider data. Despite this significant effort, there remain important shortcomings in the knowledge of proton structure. We will review present experimental knowledge and discuss the impact future high precision measure- ments at Jefferson Laboratory and EIC will have.
E-mail: [email protected]
Plenary 9 / 124
LIGO/VIRGO Observations of Neutron Star Merger GW170817
Author: Jocelyn Read1
1 CSU Fullerton
Corresponding Author: [email protected]
Neutron stars host the densest stable matter in the universe. Accurately modeling their multi- messenger astrophysics relies on a detailed description of the equation of state above nuclear den- sity. Astronomical observations, including binary pulsar dynamics, x-ray bursts and timing, and gravitational-wave observations, can in turn be used to constrain the properties of this dense mat- ter. On August 17, 2017 the Advanced LIGO and Advanced Virgo detectors discovered the first gravitational- wave signal consistent with a binary neutron star inspiral. A gamma-ray burst detected 1.7 seconds after merger confirmed the long-held hypothesis that neutron-star mergers produce short gamma- ray bursts, and the three-dimensional localization of the source using LIGO and Virgo data enabled a successful electromagnetic follow-up campaign that identified an associated kilonova in a galaxy ∼40 Mpc from Earth. Using the observed gravitational waves we are able to constrain the equation of state of dense matter in neutron stars. I will outline how these constraints are made, how they connect with other astro- nomical observations, and outline future prospects for connecting gravitational-wave astronomy with above-nuclear-density physics.
E-mail: [email protected]
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Collaboration name: LIGO Scientific Collaboration and Virgo Collaboration
Plenary 9 / 93
Outflow from Neutron Star Mergers
Author: Kenta Hotokezaka1
1 Princeton University
Corresponding Author: [email protected]
A neutron star merger, GW170817, was discovered by Advanced LIGO. The gravitational wave signal is followed by electromagnetic counterparts in multi-wavelength including GRB 170817A, kilonova, and non-thermal synchrotron afterglow. These emissions are produced by outflows launched inthe merger. I will talk about the properties of different components of merger outflows and implications of electromagnetic observations of GW170817.
E-mail: [email protected]
Plenary 9 / 238
Physics from the Gravitational and Electromagnetic Waves of a Neutron Star Merger
Author: Daniel Kasen1
1 UC Berkeley/LBNL
Corresponding Author: [email protected]
The recent detection of gravitational waves and associated electromagnetic emission from abinary neutron star merger has illuminated the physics of strong gravity and dense matter, and addressed long standing questions as to the origin of the heaviest elements in the universe. I will review our physical understanding of compact object mergers — grounded in theoretical calculations and numerical simulations — and will describe how observations of gravitational waves, high energy photons, and radioactively powered optical emission have important physical implications, includ- ing constraints on the speed of gravity, the expansion rate of the universe, the equation of state of nuclear matter, and the nucleosynthesis of the heavy elements. I’ll highlight the successes andlim- itations of models of neutron star mergers, and anticipate what we may see and learn in a hopeful future of numerous, diverse joint gravitational + electromagnetic wave detections.
E-mail: [email protected]
QCDHS / PPHI / 131
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The Proton Radius Puzzle – Why We All Should Care
Author: Gerald Miller1
1 University of Washington
Corresponding Author: [email protected]
A new scalar boson which couples to the muon and proton can simultaneously solve the proton radius puzzle and the muon anomalous magnetic moment discrepancy. Using a variety of measure- ments, we constrain the mass of this scalar and its couplings to the electron, muon, neutron, and proton. Making no assumptions about the underlying model, these constraints and the requirement that it solve both problems limit the mass of the scalar to between about 100 keV and 100 MeV. We identify two unexplored regions in the coupling constant-mass plane. The implications of recent experiments are discussed.
E-mail: [email protected]
Physics at High Energies / 338
CMS Physics Performance with Precision Timing
Author: Olmo Cerri1
1 Caltech
Corresponding Author: [email protected]
As part of the Phase II upgrade program, the Compact Muon Solenoid (CMS) detector will incorpo- rate a new timing layer designed to measure minimum ionizing particles (MIPs) with a time resolu- tion of ∼30 ps. Precision timing will mitigate the impact of the challenging levels of pileup expected at the High Luminosity LHC. The time information assigned to each track will enable theuseof 4D-vertexing which will render a 5-fold pile-up reduction, thus recovering the current conditions. Precision timing will also enable new time-based isolations and improved b-tagging algorithms. All of this translates into a ∼20% gain in effective luminosity when looking at di-Higgs boson events decaying to a pair of b-quarks and two photons. We present the expected improvements in physics performance with precision timing with the upgraded CMS detector.
E-mail: [email protected]
Collaboration name: CMS Collaboration
Parton and Gluon Distributions in Nucleons and Nuclei / 23
Accessing the Generalized Parton Distributions in the Valence Re- gion at Jefferson Laboratory
Author: Maxime DEFURNE1
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1 CEA-Saclay
Corresponding Author: [email protected]
The generalized parton distributions (GPDs) describe the correlations between the transverse po- sition and the longitudinal momentum of a parton inside the nucleon. They represent the next step toward a complete description of the nucleon in terms of quarks and gluons. They are accessi- ble through deep exclusive processes among which we find the deeply virtual Compton scattering (DVCS) and the deep virtual meson production (DVMP). With its longitudinally polarized electron beam sent to fixed targets inside three experimental Halls, Jefferson Laboratory is a unique facility to probe the quarks and gluons in the valence region of the nucleon. The first experimental evidence of GPD sensitivity at Jefferson Laboratory was provided by measuring a non-zero beam spin asym- metry for photon electroproduction, arising from the interference between Bethe-Heitler and DVCS, in 1999 in the Hall B of Jefferson Laboratory. Then followed a complete experimental program ded- icated to DVMP and DVCS in the different experimental Halls. In this talk, we are going to introduce the GPDs and the information they encode about the inner structure of the nucleon. Then we are going to give an overview of the main deep exclusive pro- cesses results collected at Jefferson Laboratory and the information they have provided about the GPDs. Finally we will discuss the answers we can expect from the ongoing/future experimental program with the recently upgraded experimental Halls and the 12 GeV electron beam.
E-mail: [email protected]
Collaboration name: Jefferson Laboratory
Tests of Symmetries and the Electroweak Interaction / 255
Hadronic Parity Violation and the Large-Nc Expansion
Author: Matthias Schindler1 Co-authors: Jared Vanasse 2; Roxanne Springer 3
1 University of South Carolina 2 Stetson University 3 Duke University
Corresponding Author: [email protected]
Parity-violating quark-quark interactions are well understood within the Standard Model, but their manifestation at the hadronic level is complicated by nonperturbative QCD effects. While different parameterizations of parity-violating nucleon-nucleon interactions exist, very little is known about the corresponding couplings. The application of the large-Nc expansion to parity-violating nucleon- nucleon interactions provides theoretical constraints on the size of the couplings. This analysis establishes a hierarchy of terms that can be mapped onto parity-violating potentials. This hierarchy implies relations between couplings and helps to delineate the terms that should be most important in phenomenological applications.
E-mail: [email protected]
Quark Matter and High Energy Heavy Ion Collisions / 304
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QCD Phase Diagram
Author: Mikhail Stephanov1
1 University of Illinois at Chicago
Corresponding Author: [email protected]
The crucial properties of the QCD vacuum — confinement and chiral symmetry breaking —undergo qualitative changes at sufficiently high temperatures and/or baryon densities. Determining where on the phase diagram and how the transitions between QCD phases are accomplished is the ma- jor goal of heavy-ion collision experiments, as well as of theoretical efforts including first-principle lattice calculations. Is there a critical point in QCD separating crossover from the first order tran- sition on the boundary between quark-gluon plasma and hadron gas phases? Heavy-ion collision experiments could answer this question by focusing on universal signatures characteristic of critical phenomena.
E-mail: [email protected]
Physics at High Energies / 119
Expected Performance of the Upgraded ATLAS Experiment for HL-LHC
Author: Peilian Liu1
1 UC Berkeley
Corresponding Author: [email protected]
The Large Hadron Collider (LHC) has been successfully delivering proton-proton collision dataat the unprecedented center of mass energy of 13 TeV. An upgrade is planned to increase the instanta- neous luminosity delivered by the LHC in what is called the HL-LHC, aiming to deliver a total of up to 3,000 fb−1 to 4,000 fb−1 of data per experiment. To cope with the expected data-taking conditions, ATLAS is planning major upgrades of the detector. It is now a critical time for these upgrade projects and during the last year and a half, six Technical Design Reports (TDR) were produced by the ATLAS Collaboration. In these TDRs the physics motivation and benefits of such upgrades are discussed together with details of the upgrade project itself. In this contribution we review the expected perfor- mance of the upgraded ATLAS detector and the expected reach for physics measurements as well as the discovery potential for new physics that is expected by the end of the HL-LHC data-taking. The performance of object reconstruction under the expected pile-up conditions will beshown, includ- ing a fully re-optimized b-tagging algorithm. Important benchmark physics projections including di-Higgs boson production sensitivity will be discussed.
E-mail: [email protected]
Collaboration name: ATLAS Collaboration
Parton and Gluon Distributions in Nucleons and Nuclei / 347
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Drell-Yan Physics with Negative Pion Beams and Polarized Pro- ton Targets at COMPASS
Author: Matthias Grosse Perdekamp1
1 UIUC
Corresponding Author: [email protected]
The proton is a complex composite object. Its structure, the dynamics of its constituents andits mass presently cannot be calculated from Quantum Chromo Dynamics without simplifying model assumptions. Momentum- and spin-dependent distributions of the constituent partons, quarks and gluons, have been determined from the QCD analysis of data sets taken in deep inelastic lepton- proton scattering experiments and in high energy proton-proton collider experiments. Despite the very significant experimental and theoretical effort, there remain important shortcomings inthe knowledge of proton structure. COMPASS at CERN aims to improve the knowledge of Generalized Parton Distributions (GPDs) through exclusive muon-proton scattering. Using Drell-Yan production of muon pairs with negative pion beams on polarized proton targets, COMPASS will constrain transverse momentum dependent quark distributions of the proton. The Drell-Yan process is a well-understood electromagnetic effect in which a beam-hadron quark/anti- quark annihilates with a target hadron anti-quark/quark. It is well suited to explore the sea quark structure of the proton, transverse momentum- and transverse spin-dependent quark distributions (TMDs) and nuclear effects in proton quark structure. The presentation will introduce the Drell-Yan process and discuss the latest results on TMD observables from COMPASS. The talk will conclude with a discussion of plans for future Drell-Yan experiments with high-intensity meson and anti- proton beams at the CERN SPS.
E-mail: [email protected]
Collaboration name: COMPASS
QCDHS / PPHI / 148
The Rydberg Constant and Proton Size from Atomic Hydrogen
Author: Lothar Maisenbacher1
Co-authors: Alexey Grinin 1; Arthur Matveev 1; Beyer Axel 1; Ksenia Khabarova 2; Nikolai Kolachevsky 2; Randolf Pohl 3; Theodor W. Hänsch 4; Thomas Udem 1; Vitaly Andreev 1
1 Max Planck Institute of Quantum Optics 2 Lebedev Physical Institute 3 Max Planck Institute of Quantum Optics; Johannes Gutenberg University Mainz 4 Max Planck Institute of Quantum Optics; Ludwig Maximilians University Munich
Corresponding Author: [email protected]
Precision measurements of atomic hydrogen (H) have long been successfully used to extract funda- mental constants and to test bound-state quantum electrodynamics. Both the Rydberg constant R∞ and the proton root mean square charge radius rp can be determined by H spectroscopy, requiring
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the measurement of at least two transition frequencies. With the very precisely measured 1S-2S tran- sition frequency serving as a corner stone [1], the current limitation is the measurement precision of other H transition frequencies. Moreover, the CODATA 2014 value [2] for rp, containing the H spectroscopy world data and elastic scattering results, disagrees by 5.6 standard deviations (σ) with the much more precise value extracted from spectroscopy of muonic hydrogen (µp) [3]. Using a cryogenic beam of H atoms optically excited to the initial 2S state, we measured the 2S-4P transition in H with a relative uncertainty of 4 parts in 1012 [4]. Combining our result with the 1S-2S transition frequency yields the values of the Rydberg constant R∞ = 10973731.568076(96) −1 m and rp = 0.8335(95) fm. Our rp value is 3.7σ smaller than the CODATA value, but in good agreement with the µp value. [1] C.G. Parthey et al., Phys. Rev. Lett. 107, 203001 (2011). [2] P.J. Mohr et al., Rev. Mod. Phys. 88, 035009 (2016). [3] A. Antognini et al., Science 339, 417 (2013). [4] A. Beyer et al., Science 358, 79 (2017).
E-mail: [email protected]
Tests of Symmetries and the Electroweak Interaction / 178
Final Results from the n3He Experiment: Parity Violation in n- 3He Capture
Author: Michael Gericke1
1 University of Manitoba
Corresponding Author: [email protected]
Parity violation (PV), first observed in semileptonic decays, has been determined precisely for quarks and leptons as part of the Standard Model. At the hadronic level, it offers a unique probe of nucleon structure and the underlying low-energy behavior of non-perturbative QCD. The hadronic weak interaction is characterized in terms of five spin and isospin dependent S-P transition amplitudes. There is an active program to determine these low energy couplings from hadronic PV observables using cold neutron beams at the Spallation Neutron Source (ORNL) and the NCNR reactor (NIST). These experiments are carried out in few-body observables, for which the nuclear wave functions are exactly calculable, but the effects are dominated by the strong interaction by seven orders of magnitude. The n3He experiment recently completed a measurement of the PV directional proton asymmetry with respect to the neutron spin in the reaction n + 3He → p + 3H. In this talk, we will report the final result, which is sensitive to the ∆I = 0, 1 transition amplitude and provides significant constraints for new theory calculations.
E-mail: [email protected]
Collaboration name: n3He Collaboration
Funding source: DOE, NSF, NSERC, CFI
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Quark Matter and High Energy Heavy Ion Collisions / 364
Lattice QCD Constraints on the QCD Critical Point
Author: Alexei Bazavov1
1 Michigan State University
Corresponding Author: [email protected]
The physics of the transition from the hadronic to quark-gluon plasma phase is non-perturbative and lattice QCD provides a framework for ab initio calculations in this regime of QCD. It is expected that the QCD phase diagram in the temperature-baryon chemical potential plane contains a line of first-order phase transitions that ends at a critical point. Ab initio calculations at non-zero chemical potential are difficult due to the sign problem. However, significant progress has beenmadeby using the Taylor expansion and imaginary chemical potential methods. Lattice calculations of the fluctuations and correlations of conserved charges and the higher-order cumulants, that I willreview in this talk, allow one to access a region of non-zero chemical potential and put constraints on the possible location of the critical point.
E-mail: [email protected]
Physics at High Energies / 334
Precision Timing with the CMS Detector
Author: Irene Dutta1
1 Caltech
Corresponding Author: [email protected]
The Compact Muon Solenoid (CMS) detector at the CERN Large Hadron Collider (LHC) isundergo- ing an extensive Phase II upgrade program to prepare for the challenging conditions of the High- Luminosity LHC (HL-LHC). A new timing layer is designed to measure minimum ionizing particles (MIPs) with a time resolution of ∼30 ps and hermetic coverage up to a pseudo-rapidity of |η| = 3. This MIP Timing Detector (MTD) will consist of a central barrel region based on LYSO:Ce crystals read out with SiPMs and two end-caps instrumented with radiation-tolerant Low Gain Avalanche Detectors (LGADs). The precision time information from the MTD will reduce the effects ofthe high levels of pile-up expected at the HL-LHC, and will bring new and unique capabilities to the CMS detector. We present the current status and ongoing R&D of the MTD, including recent test beam results.
E-mail: [email protected]
Collaboration name: CMS Collaboration
QCDHS / PPHI / 102
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Data Analysis and Preliminary Results of the Proton Charge Ra- dius Experiment (PRad) at JLab
Author: Weizhi Xiong1 Co-author: Chao Peng 1
1 Duke University
Corresponding Author: [email protected]
In order to investigate the proton radius puzzle, the PRad experiment (E12-11-106) [1] was performed in 2016 in Hall B at Jefferson Lab, with both 1.1 and 2.2 GeV unpolarized electron beams. Theex- periment aims to measure the e-p elastic scattering cross section at unprecedented low values of the momentum transfer squared region (Q2 = 2 × 10−4 − 0.06 (GeV/c)2), with a sub-percent precision. The PRad experiment utilizes a non-magnetic calorimetric method with a large acceptance andhigh resolution calorimeter (HyCal), and two large area, high spatial resolution Gas Electron Multiplier (GEM) detectors. To have a better control over the systematic uncertainties, the absolute e-p elastic scattering cross section is normalized to that of the well-known Moller scattering process, whichis measured simultaneously within similar kinematics and geometrical acceptances. The windowless H2-gas-flow target utilized in the experiment largely removes a typical background source, thetar- get cell windows. In this talk, we will discuss details of the data analysis and present preliminary results from both beam energy settings. [1] Spokespersons: A. Gasparian (contact), H. Gao, M. Khandaker, D. Dutta.
E-mail: [email protected]
Collaboration name: PRad Collaboration
Funding source: Supported in part by the U.S. Department of Energy under Contract No. DE-FG02-03ER41231, NSF MRI award PHY-1229153
Tests of Symmetries and the Electroweak Interaction / 2
Large-Nc HPNC Analyses Post NPDGamma
Author: Wick Haxton1 Co-authors: Barry Holstein 2; Susan Gardner 3
1 UC Berkeley 2 University of Massachusetts, Amherst 3 University of Kentucky
Corresponding Author: [email protected]
It has long been appreciated that low-energy weak parity non-conserving interactions between nu- cleons are governed by five S-P amplitudes, as originally described by Danilov. The formalism can also be recast in pionless effective field theory, where the low-energy constants (LECs) are thecoef- ficients of the Danilov amplitudes. Lacking five high-quality independent constraints on theseLECs, many past analyses have relied on meson exchange theory for some guidance as to which of the five amplitudes might be dominant. This approach has had mixed success in correlating the data, par- ticularly as no experimental evidence has so far emerged for a nonzero weak pion-nucleon-nucleon
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coupling. Recently a new hierarchy for the LECs has emerged from large Nc QCD. I describe a recent analysis based on this approach, one that appears to describe existing data quite well, while altering the relationships among past and anticipated experiments. I discuss how NPDGamma, other new experiments, and a future lattice QCD calculation of the isotensor Danilov amplitude will further advance the field.
E-mail: [email protected]
Funding source: Office of Nuclear Physics, Department of Energy, the National Science Foundation, and the Heising- Simons Foundation
Parton and Gluon Distributions in Nucleons and Nuclei / 168
Generalized Parton Distributions of the Deuteron in a Covariant Framework
Authors: Adam Freese1; Ian Cloet1
1 Argonne National Laboratory
Corresponding Author: [email protected]
Generalized parton distributions (GPDs) of the deuteron have been calculated. The results of these calculations and the formalism used will be presented. General properties of spin-1 GPDs, including polynomiality sum rules, will be discussed. It will be shown that these expected properties are observed in a convolution formalism if nuclear structure is calculated in a Lorentz-covariant manner. A four-Fermi contact interaction based on the NJL model is used to construct a covariant deuteron wave function, which is in turn used to calculate GPDs, gravitational form factors, and transverse (impact parameter dependent) parton densities of the deuteron.
E-mail: [email protected]
Funding source: ANL LDRD
Quark Matter and High Energy Heavy Ion Collisions / 227
Searching for the QCD Critical Point Through Fluctuations at RHIC
Author: Roli Esha1
1 UCLA
Corresponding Author: [email protected]
Fluctuations and correlations of conserved quantities (baryon number, strangeness, and charge) can be used to probe phases of strongly interacting QCD matter and the possible existence of a critical point in the phase diagram. The cumulants of the multiplicity distributions related to these conserved
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quantities are expected to be sensitive to possible increased fluctuations near a critical point and their ratios can be directly compared to the ratios of the susceptibilities from Lattice QCD. In this talk, we will present the√ measurements of the cumulants of net-proton multiplicity distributions from Au+Au collisions at sNN = 7.7, 11.5, 14.5, 19.6, 27, 39, 62.4 (up to fourth order) and 200 GeV (up to sixth order) as measured by the STAR experiment at RHIC. Multi-particle correlation functions will also be presented. The measurement of higher-order cumulants are extremely sensitive to experimental artifacts. Cur- rent efficiency correction methods are based on Binomial models. We will introduce an unfolding technique to account for multiplicity-dependent detector response and efficiency variations using large samples of AMPT events. The comparison of the various correction approaches should pro- vide important guidance towards a reliable experimental determination of the multiplicity cumu- lants.
E-mail: [email protected]
Collaboration name: STAR
Physics at High Energies / 298
Muon Spectrometer Phase I Upgrade for the ATLAS Experiment: The New Small Wheels Project
Author: Benoit Lefebvre1
Co-author: Vachon Brigitte 2
1 McGill University 2 ATLAS
Corresponding Author: [email protected]
The instantaneous luminosity of the Large Hadron Collider at CERN will be increased uptoafactor of five with respect to the design value. To maintain excellent detection and background rejection capability in the forward region of the ATLAS detector, part of the muon detection system will be upgraded during the LHC long shutdown period of 2019–2020, with the complete replacement of the present first station in the forward regions with the so-called New Small Wheels (NSWs).The NSWs will have a diameter of approximately 15 m and will be made of two detector technologies: Micromegas detectors and small-strip thin gap chambers (sTGC). The physics motivation for this significant upgrade to the ATLAS detector will be presented. The design choices made toaddress the physics needs will be discussed. Finally, the status of the ongoing detector modules production will be presented.
E-mail: [email protected]
Collaboration name: ATLAS Muon Collaboration
QCDHS / PPHI / 193
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Determination of the Proton’s Charge Radius by Simultaneous Measurement of Electron- and Muon-Proton Elastic Scattering with the MUSE Experiment at PSI
Author: Paul E Reimer1
1 Argonne National Laboratory
Corresponding Author: [email protected]
The mean charge radius of the proton has been measured with elastic electron scattering andthrough spectroscopy of atomic hydrogen with consistent results. Recent results based on spectroscopic mea- surements of muonic hydrogen, however, have found a notably smaller charge radius with extremely high precision. This difference, known as the Proton Radius Puzzle, raises interesting issues ranging from experimental and methodological issues to physics beyond the Standard Model. To address some of these issues, the MUon proton Scattering Experiment (MUSE) at the Paul Scherrer Institute will measure positive and negative muon, electron and positron elastic scattering from the proton. The experiment will cover a four-momentum-transfer range from 0.002 to 0.08GeV2. These data will be used to study possible differences between electron and muon interactions, to measure two- photon exchange effects, and to extract the proton charge radius. An overview of the experiment and its status will be presented.
E-mail: [email protected]
Collaboration name: MUSE
Funding source: Supported in part by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No.DE- AC02-06CH11357.
Tests of Symmetries and the Electroweak Interaction / 243
Lattice QCD for Hadronic Parity Violation
Author: Andre Walker-LoudNone
Corresponding Author: [email protected]
The parity violating neutral current is the least well understood of all currents in the Standard Model. At low energies, these weak interactions manifest as short distance, 4-fermion operators. Unlike their flavor-changing charged counterparts, which are easy to detect experimentally, the neutral current interactions exist in the background of the strong interactions with a typical strength of 2 ∼ −7 ∼ GF Fπ 10 , where Fπ 92 MeV is the pion decay constant, a typical hadronic scale. Therefore, despite major efforts, there are very few measurements of the hadronic neutral weak interaction. Lattice QCD is a non-perturbative regulator for QCD, the fundamental theory of strong interactions, and provides a rigorous tool with which to compute the strength of the hadronic neutral current in the simplest hadronic and nuclear systems. I will describe a long-term effort aimed at understanding hadronic parity violation from QCD. One of the simplest systems to use lattice QCD for, the iso- tensor hadronic parity violating NN amplitude, is one of the most promising for shedding light on our current understanding. I will motivate the need and application of lattice QCD for understanding hadronic parity violation from the Standard Model and highlight related lattice QCD results.
E-mail: [email protected]
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Collaboration name: CalLat
Funding source: DOE
Quark Matter and High Energy Heavy Ion Collisions / 312
What Have We Leant from Quarkonia Production in Relativistic Heavy Ion Collisions?
Author: Che-Ming Ko1
1 Texas A&M University
Corresponding Author: [email protected]
Since the pioneering study by Matsui and Satz on J/ψ suppression by quark-gluon plasma formation in relativistic heavy ion collisions, there have been a large number of theoretical and experimental studies on this topic. These studies have significantly enhanced our understanding of the properties of J/psi, its excited states, and other quarkonium states consisting of bottom quarks at finite temper- ature as well as of their production in heavy ion collisions. For example, some quarkonia are shown to survive in a quark-gluon plasma and can also be regenerated from heavy quarks at hadronization during heavy ion collisions. Using the hydrodynamic model for the dynamics of heavy ion collisions, many groups have found that to describe the experimental data on the nuclear modification factors and transverse momentum spectra of quarkonia measured at SPS, RHIC, and the LHC requires the inclusion of the in-medium properties and dissociation cross sections of quarkonia as well as their regeneration at hadronization. Studying quarkonia production in relativistic heavy ion collisions thus allows us to probe their in-medium properties.
E-mail: [email protected]
Funding source: US Department of Energy under Contract No. DE-SC0015266 and the Welch Foundation under Grant No. A-1358.
Parton and Gluon Distributions in Nucleons and Nuclei / 35
Probing the Strange Sea Quarks with Kaon SIDIS
Author: Fatiha Benmokhtar1
1 Duquesne University
Corresponding Author: [email protected]
It is well known that protons and neutrons are made from constituents, called quarks and gluons, which give substructure to these particles. The goal of this project is to make measurements ofthe spatial distributions and the momenta of the quarks that provide a three-dimensional map of quarks in the nuclear medium. This knowledge provides the basis of our understanding of nuclear matter in terms of the dynamics of their internal constituents. This abstract focuses on the study of the
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contribution of the sea quarks and in particular of the strange sea to the proton spin structure. This study is feasible with semi-inclusive deep inelastic scattering of electrons off proton and deuteron targets in Hall B at Jefferson Lab. To achieve the desired precision, a Ring Imagine CHerenkov (RICH) detector was built so pion, kaon and proton identification is well performed in the momentum range of 3 to 8 GeV/c. The experimental method and projected precision of the measurements of the parton distributions using Kaon SIDIS will be discussed and the status of the recently built Hybrid RICH detector will be presented.
E-mail: [email protected]
Collaboration name: RICH Collaboration of Hall B of Jefferson Lab
Funding source: NSF award # 1615067, PI F. Benmokhtar
Physics at High Energies / 272
Machine Learning for New Physics Searches
Author: Raffaele Tito D’Agnolo1
1 SLAC
Corresponding Author: [email protected]
After an introduction to machine learning from the perspective of a theoretical physicist, Iwillde- scribe a new method to perform a model independent search for new phenomena, with an emphasis on the LHC. I will discuss a systematic way to address the look-elsewhere effect and other issues that led similar attempts to fail in the past.
E-mail: [email protected]
Quark Matter and High Energy Heavy Ion Collisions / 362
The sPHENIX Detector
Author: Ron Soltz1
1 Lawrence Livermore National Laboratory
Corresponding Author: [email protected]
sPHENIX is a large-acceptance, high-rate jet and Υ detector designed to study the structure of the quark-gluon plasma in heavy ion collisions at RHIC. It consists of full calorimeter over the full azimuth for |η| < 1.1 with tracking and precision vertexing. These components will provide full jet reconstruction, heavy-flavor jet tagging, and Υ spectroscopy. We will present an overview of the sPHENIX design goals, construction, running schedule, and anticipated physics program.
E-mail:
Page 177 CIPANP 2018 - Thirteenth Conference on the Intersections of Particle … / Book of Abstracts [email protected]
Collaboration name: sPHENIX Collaboration
Funding source: DOE Office of Science
QCDHS / PPHI / 251
Lattice QCD and the Proton Radius
Author: Sergey Syritsyn1
1 Stony Brook University
Corresponding Author: [email protected]
With the continuing discrepancy in experimental measurements of the proton radius, ab initio de- termination of this quantity from QCD is urgently needed. At present, QCD calculations on a lattice are performed with physical values of light and strange quarks and adequate lattice volumes to per- mit credible control of systematic errors. One particular obstacle to computing the nucleon charge radius directly is the finite volume of the lattice, in which particle momenta are quantized making the zero-momentum limit difficult. New lattice methods have to be designed specifically tostudythe small-momentum nucleon structure on a lattice. I will overview the methodology and summarize the current status and future outlook for lattice QCD calculations of the nucleon charge radius.
E-mail: [email protected]
Tests of Symmetries and the Electroweak Interaction / 254
Nuclear Anapole Moments
Author: Sidney Cahn1 Co-authors: David DeMille 1; Emine Altuntas 2; Jeffrey Ammon 3
1 Yale University 2 NIST Gaithersburg 3 MIT Lincoln Laboratory
Corresponding Author: [email protected]
Purely hadronic weak interactions inside a nucleus produce a toroidal current distribution around the axis of nuclear spin. This distribution, known as the nuclear anapole moment, produces alocal magnetic field that couples to the spin of a penetrating electron. This in turn gives rise toanuclear spin-dependent parity-violating (NSD-PV) electron-nucleus interaction. We study NSD-PV effects using diatomic molecules, where the signal can be dramatically amplified due to near-degeneracies of opposite parity hyperfine/rotation levels. We recently demonstrated unprecedented experimental sensitivity to NSD-PV interactions in the test system 138Ba19F, where the effect is known to be vanishingly small. Our results indicate control over systematic errors at a level below the statistical uncertainty. We discuss plans to measure NSD-PV using 137BaF at similar sensitivity. This will
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yield the first measurement of a nuclear anapole moment for an odd-neutron nucleus, and provide novel information on hadronic PV interactions. Anticipated future improvements should enable measurements of anapole moments of light nuclei, where the nuclear structure calculations needed to interpret anapole moments in terms of hadronic weak interaction parameters are increasingly reliable.
E-mail: [email protected]
Funding source: NSF
Quark Matter and High Energy Heavy Ion Collisions / 230
The RHIC Beam Energy Scan Phase II Physics and Upgrades
Author: David Tlusty1
1 Rice University
Corresponding Author: [email protected]
The exploration of the QCD phase diagram has been one of the main drivers of contemporary nu- clear physics. The Relativistic Heavy Ion Collider (RHIC) at BNL is uniquely suited for thistask through its Beam Energy Scan (BES) program which allowed for a large range in baryon chemical potential µB as was successfully demonstrated after the completion of Phase 1 in 2014. Phase2 of the BES at RHIC is scheduled for 2019–2020 and will explore with precision√ measurements the intermediate-to-high µB region of the√ QCD phase diagram, 5 energies sNN from 19.6 to 7.7 GeV in the collider mode and 8 energies sNN from 7.7 to 3.0 GeV in the fixed-target mode. Some of the key measurements are: the net-protons kurtosis that could pinpoint the position of a critical point, the directed flow that might prove a softening of the EOS, and the chiral restoration in the dielectron channel. These measurements will be possible with an order of magnitude better statistics provided by the electron cooling upgrade of RHIC and with the detector upgrades planned to improve STAR’s acceptance. The talk will review the BES Phase-2 program and the physics opportunities enabledby these upgrades.
E-mail: [email protected]
Parton and Gluon Distributions in Nucleons and Nuclei / 143
Novel Experimental Probes of QCD in SIDIS and e+e− Annihila- tion
Author: Anselm Vossen1
1 Duke University/JLab
Corresponding Author: [email protected]
Semi-inclusive deep inelastic Scattering (SIDIS) has been a very successful tool to investigate the partonic structure of the nucleon over the last decade. Compared to inclusive DIS, information
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about the quantum numbers of the struck quark can be inferred from the identity, distribution and polarization of the final state hadrons. Up to now, virtually all knowledge about the quark-gluon structure of the nucleon from SIDIS has been gained from distributions of independently observed scalar hadrons. However, given the amount of data current and future experiments at JLab, RHIC, KEK and the EIC will collect, new paradigms have to be explored to leverage the statistical power of the data. Similar to other fields in nuclear and particle physics, it is natural to move towards the exploration of more complex correlations in the observed final state. This talk will discuss recent results and future prospects of using di-hadron correlations and polarized hyperon probes to study QCD in SIDIS, pp and e+e− annihilation. Both of these probes exploit additional degrees of freedom in the final state, given by the relative momentum of the di-hadron pair and the hyperon polarization, respectively. This talk will focus on recent results and opportunities opened by these probesto study nucleon structure, hadronization and QCD in novel ways. The focus will be on planned SIDIS measurements at CLAS12 at JLab and e+e− at Belle II.
E-mail: [email protected]
Physics at High Energies / 320
How a Future Leptonic Collider Will Indirectly Probe Neutralino Dark Matter
Author: Ran Huo1
1 UC Riverside
Corresponding Author: [email protected]
We apply the covariant derivative expansion method to integrate out the neutralinos and charginos in the minimal supersymmetric Standard Model. The results are presented as set of pure bosonic dimension-six operators in the Standard Model effective field theory. In global fitting to thepro- posed leptonic collider constraint projections, special phenomenological emphasis is paid to the gaugino mass unification scenario (M2 ≃ 2M1) and anomaly mediation scenario (M1 ≃ 3.3M2). These results show that the precision measurement experiments in future lepton colliders will pro- vide a very useful complementary job in probing the electroweakino sector, in particular, filling the gap of the soft lepton plus the missing ET channel search left by the traditional collider, where the neutralino as the lightest supersymmetric particle is very degenerated with the next-to-lightest chargino/neutralino.
E-mail: [email protected]
QCDHS / PPHI / 356
Nucleon Form Factors in Dispersively Improved Chiral Effective Theory
Author: Christian Weiss1
1 Jefferson Lab
Corresponding Author: [email protected]
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We present a new method for calculating the nucleon electromagnetic form factors (EM FFs) com- bining Chiral Effective Field Theory (ChEFT) and dispersion analysis [1]. The FFs are expressedas 2 dispersive integrals over the two-pion cut at timelike t > 4Mπ. The spectral functions are com- puted using elastic unitarity, chiral pion-nucleon amplitudes (LO, NLO, partial N2LO), and timelike pion FF data. The method effectively includes ππ rescattering effects and the ρ resonance and leads to major improvements compared to traditional ChEFT calculations. Higher-mass isovector and isoscalar t-channel states are described by effective poles, whose strength is fixed by sum rules (charges, radii). We obtain excellent agreement with the spacelike proton and neutron FF data up to Q2 ∼ 1 GeV2. We predict the values of the higher FF derivatives with minimal uncertainties and study their collective behavior (multiple dynamical scales, unnatural sizes). Our approach provides a FF parametrization with proper analyticity and theoretical uncertainty estimates, which can be used for analysis of low-Q2 elastic scattering data and extraction of the proton radius [2]. [1] J.M. Alarcon, C. Weiss, Phys. Rev. C 97, 055203 (2018). [2] J.M. Alarcon, C. Weiss, arXiv:1803.09748 [hep-ph].
E-mail: [email protected]
Tests of Symmetries and the Electroweak Interaction / 55
Searching for Hadronic CP Violation in Deformed Nuclei with Polar Molecules
Author: Nick Hutzler1 Co-authors: Arian Jadbabaie 1; Avikar Periwal 1; Nick Pilgram 1
1 Caltech
Corresponding Author: [email protected]
The fact that the universe is made entirely out of matter, and contains no free anti-matter, has no physical explanation. While we cannot currently say what process created the matter in the universe, we know that it must violate a number of fundamental symmetries, including those that forbid the existence of certain electromagnetic moments of fundamental particles. We can search for signatures of these electromagnetic moments via precision measurements in polar molecules, whose extremely large internal electromagnetic fields can significantly amplify these moments. These effects would arise from physics beyond the Standard Model, which enables tabletop searches for new, symmetry-violating particles and forces. With modern, quantum science techniques to control polar molecules, these searches can currently reach into the TeV scale, and offer a route to the PeV scale through advanced cooling and trapping techniques. I will discuss a new experiment being developed at Caltech to use polyatomic molecules bearing heavy, deformed nuclei to search for hadronic CP violation via nuclear magnetic quadrupole moments, which are sensitive to a wide variety of CP-violating sources beyond the Standard Model.
E-mail: [email protected]
Funding source: Heising-Simons Foundation
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Public Lecture / 381
Merging Black Holes and Einstein’s Ripples in Space Time: The Story of Advanced LIGO
Author: Barry C. Barish1
1 Caltech
Public Talk Sponsors: Physics Letters B, UC Berkeley, and UC Riverside
E-mail: [email protected]
Collaboration name: Advanced LIGO
Funding source: U.S. National Science Foundation
Plenary 10a / 382
Physics at High Energies
Authors: Heather Gray1; LinTao Wang2; Stefania Gori3; Toyoko Orimoto4; Verena Martinez Outschoorn5
1 LBNL 2 U. Chicago 3 University of Cincinnati 4 Northeastern University 5 UMass Amherst
Corresponding Authors: [email protected], [email protected]
Highlights of the Physics at High Energies parallel sessions at this conference.
E-mail: [email protected]
Plenary 10a / 383
Precision Physics at High Intensities
Authors: Aida El-Khadra1; Brendan Casey2; Kent Paschke3; Renee Fatemi4
1 University of Illinois at Urbana-Champaign 2 Fermilab
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3 University of Virginia 4 University of Kentucky
Corresponding Authors: [email protected], [email protected]
Highlights of the Precision Physics at High Intensities parallel sessions at this conference.
E-mail: [email protected]
Plenary 10a / 385
Neutrino Masses and Neutrino Mixing
Authors: Andre de Gouvea1; Daniel Dwyer2; Elisa Resconi3; Jason Detwiler4; Kanika Sachdev5
1 Northwestern University 2 LBNL 3 TU-Munich 4 Univ. of Washington 5 Fermi National Accelerator Laboratory
Corresponding Author: [email protected]
Highlights of the Neutrino Masses and Neutrino Mixing parallel sessions at this conference.
E-mail: [email protected]
Plenary 10a / 388
Particle and Nuclear Astrophysics
Authors: Barry Davids1; Masaru Shibata2; Rebecca Surman3; Samaya Nissanke4; Wick Haxton5
1 TRIUMF 2 AEI Potsdam 3 University of Notre Dame 4 Radboud U. 5 UC Berkeley
Corresponding Author: [email protected]
Highlights of the Particle and Nuclear Astrophysics parallel sessions at this conference.
E-mail: [email protected]
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Plenary 10a / 392
Nuclear Forces and Structure, NN Correlations, and Medium Ef- fects
Authors: Bradley Sherrill1; Filomena Nunes2; Gerald Miller3; John Arrington4; Paul E Reimer4; Scott Bogner1
1 Michigan State University 2 MSU 3 University of Washington 4 Argonne National Laboratory
Corresponding Author: [email protected]
Highlights of the Nuclear Forces and Structure, NN Correlations, and Medium Effects parallel ses- sions at this conference.
E-mail: [email protected]
Plenary 10b / 389
Heavy Flavors and the CKM Matrix
Authors: Chris Bouchard1; Christoph Schwanda2; Paula Collins3; Wolfgang Altmannshofer4
1 University of Glasgow 2 HEPHY Vienna 3 CERN 4 University of Cincinnati
Corresponding Author: [email protected]
Highlights of the Heavy Flavors and the CKM Matrix parallel sessions at this conference.
E-mail: [email protected]
Plenary 10b / 390
QCD, Hadron Spectroscopy, and Exotics
Authors: Bernhard Ketzer1; Krishna Kumar2; Raul Briceno3; Seamus Riordan4; Yuanning Gao5
1 U. Bonn 2 Stonybrook University 3 Old Dominion University 4 Argonne National Laboratory
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5 Tsinghua U.
Corresponding Author: [email protected]
Highlights of the QCD, Hadron Spectroscopy, and Exotics parallel sessions at this conference.
E-mail: [email protected]
Plenary 10b / 391
Parton and Gluon Distributions in Nucleons and Nuclei
Authors: Feng Yuan1; Jen-Chieh Peng2; Juan Rojo3; Ralf Seidl4; Zhongbo Kang5
1 LBNL 2 University of Illinois 3 Oxford U. 4 RIKEN 5 UCLA
Corresponding Author: [email protected]
Highlights of the Parton and Gluon Distributions in Nucleons and Nuclei parallel sessions at this conference.
E-mail: [email protected]
Plenary 10b / 384
Cosmic Physics and Dark Energy, Inflation, and Strong-Field Grav- ity
Authors: David Kirkby1; Kev Abazajian2; Mark Trodden3; Neelima Sehgal4
1 Univ of California Irvine 2 UC Irvine 3 University of Pennsylvania 4 Stony Brook University
Corresponding Author: [email protected]
Highlights of the Cosmic Physics and Dark Energy, Inflation, and Strong-Field Gravity parallel ses- sions at this conference.
E-mail: [email protected]
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Plenary 10b / 387
Dark Matter
Authors: George Fuller1; Jianglai Liu2; Matt Pyle3; Reina Maruyama4
1 University of California, San Diego 2 Shanghai Jiao Tong University 3 University of California Berkeley 4 Yale University
Corresponding Author: [email protected]
Highlights of the Dark Matter parallel sessions at this conference.
E-mail: [email protected]
Plenary 10b / 386
Tests of Symmetries and the Electroweak Interaction
Authors: Brad Filippone1; Jordy de Vries2; Robert Redwine3; Vincenzo Cirigliano4; Wick Haxton5
1 Caltech 2 NIKHEF 3 Massachusetts Institute of Technology 4 Los Alamos National Laboratory 5 UC Berkeley
Corresponding Author: [email protected]
Highlights of the Tests of Symmetries and the Electroweak Interaction parallel sessions at this con- ference.
E-mail: [email protected]
Plenary 10b / 393
Quark Matter and High Energy Heavy Ion Collisions
Authors: Helen Caines1; Jacquelyn Noronha-Hostler2; Marta Verweij3; Nu Xu4; Wick Haxton5
1 Yale University 2 Rutgers University 3 Vanderbilt University 4 LBNL
Page 186 CIPANP 2018 - Thirteenth Conference on the Intersections of Particle … / Book of Abstracts
5 UC Berkeley
Corresponding Author: [email protected]
Highlights of the Quark Matter and High Energy Heavy Ion Collisions parallel sessions at thiscon- ference.
E-mail: [email protected]
Plenary 10b / 394
Closing Remarks
Author: Brendan Casey1
1 Fermilab
Corresponding Author: [email protected]
Closing remarks, acknowledgements, and announcement of the co-chair for CIPANP 2021.
E-mail: [email protected]
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