IceCube Particle Astrophysics Symposium Neutrino Physics Results at MINERvA 2013
C.L. McGivern
Outline
Motivation Carrie McGivern
NuMI Beam On behalf of the MINERvA Collaboration
MINERvA Experiment University Of Pittsburgh CCQE Results
CCIncPion Status
Conclusion May 14, 2013
1 / 25 Outline this is the way it’s going to go...
IceCube Particle Astrophysics Symposium 2013
C.L. McGivern
Outline Motivation Motivation NuMI Beam and the MINERvA Experiment NuMI Beam
MINERvA Charged Current Quasi-Elastic (CCQE) Results - fresh off Experiment the presses CCQE Results Status of the CC Inclusive Pion analysis CCIncPion Status
Conclusion
2 / 25 Motivation want are we trying to learn here?
IceCube Particle MainINjectorExpeRimentv-A Astrophysics Symposium measure the cross sections of neutrino-nucleus interactions 2013
C.L. McGivern Cross sections between 0.1-10 GeV not as well known, but important in the regime of oscillation experiments Outline Motivation Neutrinos Anti-Neutrinos NuMI Beam
MINERvA Experiment
CCQE Results
CCIncPion Status
Conclusion
J.A. Formaggio and G.P. Zeller, Rev. Mod. Phys. 84, 1307-1341, 2012
3 / 25 Motivation want are we trying to learn here?
IceCube Particle Do not understand the energy dependence in the CCQE Astrophysics cross section Symposium 2013 MiniBooNE and SciBooNE disagree with the higher energy C.L. McGivern NOMAD data, MINERvA is in the energy range that can help resolve this discrepancy Outline Primary signal in the oscillation experiments Motivation
NuMI Beam
MINERvA Experiment
CCQE Results
CCIncPion Status
Conclusion
Additionally, neutrinos make for a good weak-interaction probe of the nuclear structure 4 / 25 NuMI Beam Neutrinos at the Main Injector
IceCube Particle 120 GeV proton beam from Astrophysics the Main Injector Symposium 2013 Average spill of 35x1012 C.L. McGivern Protons on Target (POT),
Outline with a beam power of
Motivation 300-350 kW at ∼0.5 Hz
NuMI Beam Advantages - tunable beam Can change the energy of the beam MINERvA by moving the target wrt the horns Experiment Neutrino or anti-neutrino beam mode CCQE Results depending on horn current
CCIncPion Status
Conclusion
5 / 25 NuMI Beam low energy (LE) beam flux
IceCube Particle Astrophysics Symposium 2013 Neutrino flux is estimated C.L. McGivern from hadron production Outline Monte Carlo (MC) is Motivation reweighted to match
NuMI Beam NA49 data
MINERvA Flux is then calculated Experiment using the GEANT4 CCQE Results simulator CCIncPion Uncertainties due to the Status NA49 data and hadron Conclusion production models are included as systematics
6 / 25 The Collaboration
IceCube Particle Astrophysics ∼80 collaborators from nuclear and particle physics Symposium 2013
C.L. McGivern
Outline
Motivation
NuMI Beam
MINERvA Experiment
CCQE Results
CCIncPion Status
Conclusion
7 / 25 The Detector
IceCube Particle 120 “modules” perpendicular to the beam direction, Astrophysics Symposium containing ∼32k readout channels 2013 Finely-segmented scintillating central tracking region C.L. McGivern Nuclear targets, plastic (CH), EM and Hadronic Outline calorimeter with additional lead and steel plates Motivation Minos near detector doubles as a muon spectometer NuMI Beam
MINERvA Experiment
CCQE Results
CCIncPion Status
Conclusion
8 / 25 The Detector in more detail
IceCube Particle Astrophysics Symposium 2013
C.L. McGivern
Outline
Motivation
NuMI Beam
MINERvA Experiment
CCQE Results
CCIncPion Status
Conclusion
9 / 25 Data Collected big THANKS to the Accelerator Division at Fermilab!!
IceCube 20 Particle 4.0x10 POT in ν-mode Astrophysics 20 Symposium 1.7x10 POT in ν¯-mode 2013
C.L. McGivern
Outline
Motivation
NuMI Beam
MINERvA Experiment
CCQE Results
CCIncPion Status
Conclusion
10 / 25 IceCube Particle Astrophysics Symposium 2013
C.L. McGivern
Outline
Motivation NuMI Beam Charged Current Quasi-Elastic Results MINERvA Experiment
CCQE Results
CCIncPion Status
Conclusion
11 / 25 Charged Current Quasi-Elastic Results released just last week!
IceCube Particle Signal Astrophysics Symposium muon track and energy deposition (recoil) that is 2013 consistent with a neutron (proton) C.L. McGivern ... Backgrounds : non-CCQE ν¯ interactions, ν interactions with a mis-reconstructed charge, and rock muons that originate from outside of the detector Outline Motivation arXiv:1305.2234 [hep-ex] arXiv:1305.2243 [hep-ex] NuMI Beam
MINERvA Experiment
CCQE Results
CCIncPion Status
Conclusion
+ − ν¯µ + p → µ + n νµ + n → µ + p
Nov. 2010 - Feb. 2011 Mar. 2010 - Jul. 2010 20 19 12 / 25 Uses 1.01 x 10 POT Uses 9.42 x 10 POT CCQE Event Selection
IceCube Particle Astrophysics Symposium 2013
C.L. McGivern
Outline
Motivation
NuMI Beam
MINERvA Experiment
CCQE Results Anti-Neutrinos Neutrinos MINOS-matched µ+ track MINOS-matched µ− track CCIncPion Reconstructed vertex in central fiducial Reconstructed vertex in central fiducial Status volume volume Conclusion ≤ 1 isolated energy shower outside of vertex ≤ 2 isolated energy showers outside of vertex region (10 cm) region (30 cm) 2 2 Reconstructed QQE -dependent recoil energy Reconstructed QQE -dependent recoil energy cut that excludes the vertex region cut that excludes the vertex region → 16,467 events, 54% efficiency, → 29,620 events, 47% efficiency, 77% purity 49% purity 13 / 25 CCQE Kinematic Distributions QE 2 anti-neutrino reconstructed Eν and QQE distributions
IceCube Assume a bound nucleon at rest with a fixed binding energy (Eb) Particle Astrophysics 2 2 QE mn−(mp−Eb) −mµ+2(mp−Eb)Eµ Symposium E = Q2 = 2EQE(E − p cos(θ )) − m2 ν 2(mp−E −Eµ+pµcos(θµ)) QE ν µ µ µ µ 2013 b
C.L. McGivern
Outline
Motivation
NuMI Beam
MINERvA Experiment
CCQE Results
CCIncPion Status
Conclusion
14 / 25 CCQE Kinematic Distributions QE 2 neutrino reconstructed Eν and QQE distributions
IceCube Assume a bound nucleon at rest with a fixed binding energy (Eb) Particle Astrophysics 2 2 QE mn−(mp−Eb) −mµ+2(mp−Eb)Eµ Symposium E = Q2 = 2EQE(E − p cos(θ )) − m2 ν 2(mp−E −Eµ+pµcos(θµ)) QE ν µ µ µ µ 2013 b
C.L. McGivern
Outline
Motivation
NuMI Beam
MINERvA Experiment
CCQE Results
CCIncPion Status
Conclusion
15 / 25 CCQE Systematic Uncertainties anti-neutrino
IceCube Particle Astrophysics Estimate by varying systematic inputs within uncertainties and Symposium then rerun the analysis 2013
C.L. McGivern Look at shape of systematics to help reduce the impact of several uncertainties (i.e. neutrino flux) Outline
Motivation
NuMI Beam
MINERvA Experiment
CCQE Results
CCIncPion Status
Conclusion
Leading systematics due to neutrino flux, recoil reconstruction, muon reconstruction, hadron interaction, and ν interaction model 16 / 25 CCQE Systematic Uncertainties neutrino
IceCube Particle Astrophysics Estimate by varying systematic inputs within uncertainties and Symposium then rerun the analysis 2013
C.L. McGivern Look at shape of systematics to help reduce the impact of several uncertainties (i.e. neutrino flux) Outline
Motivation
NuMI Beam
MINERvA Experiment
CCQE Results
CCIncPion Status
Conclusion
Leading systematics due to neutrino flux, recoil reconstruction, muon reconstruction, hadron interaction, and ν interaction model 17 / 25 CCQE Differential Cross Section 2 in bins of QQE
IceCube Particle Astrophysics Symposium 2013
C.L. McGivern
Outline
Motivation
NuMI Beam
MINERvA Experiment
CCQE Results
CCIncPion Status
Conclusion
Courtesy of D. Schmitz
18 / 25 CCQE Differential Cross Section
IceCube Particle Subtract background by fitting recoil energy distribution in bins Astrophysics 2 Symposium of QQE to MC shape background templates 2013 Unfold the reconstructed Q2 to estimate the true distribution C.L. McGivern QE Apply efficiency x acceptance corrections to the MC Outline
Motivation
NuMI Beam
MINERvA Experiment
CCQE Results
CCIncPion Status
Conclusion
GENIE: www.genie.org, NIM A614, 87 (2010) NuWro: Acta Phys. Polon. B40, 2507 (2009)
19 / 25 TEM = ”Transverse Enhancement Model”, A. Bodek, et al., Eur. Phys. J. C71 1726 (2011) CCQE Differential Cross Section ratio compared to GENIE
IceCube Particle Astrophysics Symposium Consistent with the RFG MA = 0.99 + TEM model 2013
C.L. McGivern
Outline
Motivation
NuMI Beam
MINERvA Experiment
CCQE Results
CCIncPion Status
Conclusion
GENIE: www.genie.org, NIM A614, 87 (2010) NuWro: Acta Phys. Polon. B40, 2507 (2009)
TEM = ”Transverse Enhancement Model”, A. Bodek, et al., Eur. Phys. J. C71 1726 (2011)
20 / 25 IceCube Particle Astrophysics Symposium 2013
C.L. McGivern
Outline
Motivation NuMI Beam Charged Current Inclusive Pion Status MINERvA Experiment
CCQE Results
CCIncPion Status
Conclusion
21 / 25 Charged Current Inclusive Pion Status
IceCube Particle − ± 0 MiniBooNE does not favor models with Astrophysics νµA → µ π XA Symposium + ± 0 final state interactions (FSI) 2013 ν¯µA → µ π XA C.L. McGivern
Outline
Motivation
NuMI Beam
MINERvA Experiment
CCQE Results
CCIncPion Status
Conclusion Event Selection Vertex is reconstructed in scintillator tracker fiducial volume MINOS-matched muon track with appropriate charge At least one hadron track from primary vertex, not matched to the muon track, and is consistent with a stopping pion 22 / 25 CC Inclusive Pion Status reconstructed pion energy distribution
IceCube Particle Astrophysics Use 25% of available data Symposium 2013
C.L. McGivern Look at area normalized distributions to compare Outline shapes, helps to reduce flux Motivation systematic errors NuMI Beam
MINERvA Experiment
CCQE Results
CCIncPion Status
Conclusion
23 / 25 CC Inclusive Pion Status 2 reconstructed Q and Wexp distributions and what’s next to come...
IceCube Eν = Eµ + Erecoil Resolution Particle 2 2 2 Astrophysics Q = 2Eν(Eµ − pµcos(θµ)) − mµ Q ∼ 25% Symposium 2013 2 2 2 Wexp ∼ 10% Wexp = −Q + mn + 2mn(Erecoil) C.L. McGivern
Outline
Motivation
NuMI Beam
MINERvA Experiment
CCQE Results
CCIncPion Status
Conclusion
Study pion identification to help reduce background further Use unfolding to apply detector resolution corrections and also apply efficiency corrections
24 / 25 Estimate hadron reconstruction systematic uncertainties Conclusion
IceCube Particle Astrophysics Symposium 2013 Currently putting a lot of effort into physics analyses C.L. McGivern Charged current inclusive cross sections Outline Pion production cross sections Motivation Inclusive cross section vs. various nuclei: He, C, O, Fe, Pb NuMI Beam Strangeness production cross sections MINERvA Structure functions Experiment and much more... CCQE Results
CCIncPion MINERvA will continue to run during the Nova-era Status medium energy beam Conclusion Lots of exciting results to come!
25 / 25 IceCube Particle Astrophysics Symposium 2013
C.L. McGivern
Backup Slides
Backup Slides
26 / 25 2 Recoil Energy vs. QQE
IceCube Particle Astrophysics Symposium 2013
C.L. McGivern
Backup Slides
27 / 25 CCQE Kinematic Distributions anti-neutrino muon distributions
IceCube Particle Astrophysics Symposium 2013
C.L. McGivern
Backup Slides
28 / 25 CCQE Kinematic Distributions neutrino muon distributions
IceCube Particle Astrophysics Symposium 2013
C.L. McGivern
Backup Slides
29 / 25 CCQE Systematic Uncertainty Correlation Matrices
IceCube Particle Astrophysics Symposium 2013
C.L. McGivern
Backup Slides
30 / 25 Cross Section Models for comparison
IceCube Particle Astrophysics Symposium 2013
C.L. McGivern
Backup Slides
31 / 25 Transverse Enhancement Model courtesy of G. Perdue, APS 2013 talk
IceCube Particle Astrophysics Symposium 2013
C.L. McGivern
Backup Slides
32 / 25 Transverse Enhancement Model courtesy of G. Perdue, APS 2013 talk
IceCube Particle Astrophysics Symposium 2013
C.L. McGivern
Backup Slides
33 / 25