The MINERνA Experiment
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1 The MINERνA Experiment -Brian G Tice- Rutgers, The State University of New Jersey On behalf of the MINERνA collaboration MINERνA Workshop on Electron-Nucleus Scattering XII Marciana Marina, Isola d Elba June 25-29, 2012
2 Outline Meet MINERνA The NuMI beam The MINERvA Detector First results ν μ inclusive charged current ν μ inclusive charged current ratios of nuclear targets ν μ charged current quasi elastic ν μ charged current quasi elastic June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 2
3 MINERvA Main INjector ExpeRiment ν-a MINERvA is a neutrino scattering experiment at Fermilab in Batavia, IL, USA. Collaboration of 80 nuclear and particle physicists. University of Athens University of Texas at Austin Centro Brasileiro de Pesquisas Físicas Fermilab University of Florida Université de Genève Universidad de Guanajuato Hampton University Inst. Nucl. Reas. Moscow Mass. Col. Lib. Arts Northwestern University Otterbein University Pontificia Universidad Catolica del Peru University of Pittsburgh University of Rochester Rutgers University Tufts University University of California at Irvine University of Minnesota at Duluth Universidad Nacional de Ingeniería Universidad Técnica Federico Santa María William and Mary June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 3
4 NuMI Beamline Delivers ~35x10 12 protons on target (POT) per spill at ~0.5 Hz, a beam power of kw. 120 GeV proton Carbon target pc π ± and K ± Magnetic horns focus + or - π + / K + μ + ν μ or π - / K - μ - ν μ MINERvA June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 4
5 Tuning to Hadron Production Data Hadron production simulated with Geant4 to predict flux. Flux is reweighted based on hadron production data compared to Geant4. NA49 Data v. Geant4 June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 5
6 Neutrinos Seen ν μ ν μ Data collected: LE 3.98x10 20 POT LE 1.7x10 20 POT June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 6
7 Neutrinos Seen ν μ ν μ Data collected: LE 3.98x10 20 POT LE 1.7x10 20 POT June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 7
8 MINERvA Detector 120 scintillator modules for tracking and calorimetry (~32k readout channels). Construction completed Spring He and Water added in MINOS Near Detector serves as muon spectrometer. June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 8
9 Another Module One Module 16.7 mm 17 mm X V X U Charge sharing for improved position resolution (~3 mm) and alignment σ = 3mm Scintillator - tracking Lead - EM calorimetry Steel - hadronic calorimetry June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 9
10 Inclusive Charged Current Scattering June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 10
11 Strip Number Event Reconstruction recoil blobs MINOS matched track vertex recoil blobs MINOS Module Number Reconstructed objects MINOS tracks, other tracks, vertices, endpoints, blobs vertex June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 11
12 Vertex Distributions - Acceptance MINOS-matched muons (for CC inclusives sample) Energy threshold ~2 GeV. Good angular acceptance up to scattering angles of about 10 degrees, with limit of about 20 degrees. Bias is complex but well understood. June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 12
13 Muon Energy (GeV) Recoil Energy (GeV) Neutrino Energy (GeV) Neutrino Energy (GeV) June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 13
14 Stability March 22, 2010 July 12, 2010 June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 14
15 Nuclear Target Ratios Analysis June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 15
16 250 kg Liquid He 500kg Water Active Scintillator Modules He Water Tracking Region 1 Fe / 1 Pb 323kg / 264kg 1 Pb / 1 Fe 266kg / 323kg 3 C / 1 Fe / 1 Pb 166kg / 169kg / 121kg 0.3 Pb 228kg.5 Fe /.5 Pb 161kg/ 135kg June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 16
17 250 kg Liquid He 500kg Water Active Scintillator Modules He Water Tracking Region 1 Fe / 1 Pb 323kg / 264kg 1 Pb / 1 Fe 266kg / 323kg 3 C / 1 Fe / 1 Pb 166kg / 169kg / 121kg 0.3 Pb 228kg.5 Fe /.5 Pb 161kg/ 135kg Target 3 Target 5 June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 17
18 Strip Number C An event from target 3 Fe Pb view looking upstream Pb Fe DATA Module Number Elba XII - The MINERνA Experiment Brian G. Tice June 27,
19 Strip Number C Another event from target 3 Fe Pb view looking upstream Pb Fe DATA Module Number Elba XII - The MINERνA Experiment Brian G. Tice June 27,
20 Vertices reconstructed wrongly into scintillator are background. Use upstream tracker modules as faux targets to subtract the plastic background. June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 20
21 Background Subtraction Use faux targets to predict rate if passive target were CH. Prediction done in bins of muon momentum. June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 21
22 Background Subtraction Use faux targets to predict rate if passive target were CH. Background subtracted in both MC and data ~without using MC cross section model. June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 22
23 Target 5 Results Uses ~25% neutrino data recorded and~20% of target mass. Iron Lead June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 23
24 Use a Ratio to Mitigate Errors Pb 2 Pb(Fe) and 2(1) have ~same efficiency related to XY position. Pb(2) and Fe(1) have ~same efficiency related to Z position. ε xy ε z ε xy ε z ~1 ε xy ε z ε xy ε z Fe 1 All targets in same beam flux largely cancels All targets in same detector similar reconstruction Pb CH #2 Fe CH #1 June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 24
25 Target 5 Results - Ratio Uses ~25% neutrino data recorded and~20% of target mass. Pb CH #2 Fe CH #1 Red band = systematic errors Black bars = MC+data stat. error Higher statistics Plot X, Q 2 in bins of neutrino energy June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 25
26 Systematic Error - Iron of Target 5 ~25% June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 26
27 Systematic Error - Ratio Pb CH #2 Fe CH #1 ~2.5% June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 27
28 Antineutrino Quasi Elastic Scattering June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 28
29 If elastic kinematics, E ν =2.8 GeV, Q 2 =0.1GeV 2 If elastic kinematics, E ν =2.5 GeV, Q 2 =0.3GeV 2 30 MeV deposited in single channel. Neutron interaction candidate. Beam direction View of detector from above Require a μ + matched into MINOS. Require no other tracks. Require 0 or 1 clumps of energy deposition (neutron candidate). Sum recoil energy (excluding 10cm around vertex). June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 29
30 Why don t we cut on vertex activity? We want to measure it! Scattering off a nucleus can be messy. We must interrogate the final state products to allow testing of MEC and FSI models. Illustration: Fermilab/Diana Canzone June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 30
31 Recoil Energy Cut Expect higher Q 2 QE events to have more recoil energy. Recoil cut scales with Q 2 QE. Total selection purity is ~80%. June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 31
32 Kinematic Distribution June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 32
33 Getting to dσ/dq 2 QE Background subtraction Unfolding detector smearing Efficiency correction Unfolded Q 2 QE (GeV 2 ) Unfolded Q 2 QE (GeV 2 ) June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 33
34 dσ/dq 2 QE Monte Carlo Genie M A = 0.99 GeV RFG Pauli-blocking No MEC Unfolded True Q 2 Q 2 QE (GeV) 2 ) June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 34
35 dσ/dq 2 QE Unfolded Q 2 QE (GeV 2 ) NuWro: Golan, Juszczak, Sobczyk. arxiv: [nucl-th] June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 35
36 Neutrino Charged Current Quasi Elastic Scattering June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 36
37 Recoil Region Require a μ - matched into MINOS. Require 0 or 1 other tracks (proton candidate). Require 0 or 1 clumps of energy deposition (proton candidate). Sum recoil energy (excluding 10cm around vertex). June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 37
38 Sideband regions will be used to understand background in data. Proton reconstruction not yet used in Q 2, E ν calculations. June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 38
39 June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 39
40 Neutrino and Antineutrino CCQE 2-4 GeV June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 40
41 Neutrino and Antineutrino CCQE 4-10 GeV June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 41
42 Conclusions MINERvA is performing well and is producing results. Systematic errors have been explored. Improvements possible. Nuclear target ratios analysis method works well. Needs to use full statistics in hand. Wait for more data. Our first antineutrino dσ/dq 2 QE is public. Neutrino dσ/dq 2 QE is coming soon. and more exclusive analyses are in progress! June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 42
43 Backup June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 43
44 Understanding Our Flux Vary the target position and the horn current to change the flux spectrum. Monitor spread of μ ± from π ± decay MINERvA June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 44
45 Current Flux Uncertainties Preliminary! Tertiary = non-na49 Z. Pavlovic, PhD Thesis, Texas (2008) Can be improved with work! Elba XII - The MINERνA Experiment Brian G. Tice June 27,
46 Alignment and Strip Response Elba XII - The MINERνA Experiment Brian G. Tice June 27,
47 Where do the muons go? Today's results Elba XII - The MINERνA Experiment Brian G. Tice June 27,
48 Tracking Resolutions 4.0mm σ = 2 σ= 15 mrad 2 Split-track study of rock m in tracker region Elba XII - The MINERνA Experiment Brian G. Tice June 27,
49 Muon Energy Uncertainty MINOS de/dx + mass model = 2% [MINOS, NIM A 596, 190 (2008)] range vs. curvature data-mc ~25 MeV range vs curvature in MINOS Total: ±3% p> 1.5 GeV ±5% P<1.5 GeV MINERvA mass model = 11 MeV tracker = 17 MeV Nucl.Tgts. m energy loss = 30 MeV Elba XII - The MINERνA Experiment Brian G. Tice June 27,
50 Energy Scale and Stability Elba XII - The MINERνA Experiment Brian G. Tice June 27,
51 Michels, π 0 and e/ Separation Reconstructed π 0 Michel e Photons From Reconstructed π 0 Elba XII - The MINERνA Experiment Brian G. Tice June 27,
52 shower energy resolution Elba XII - The MINERνA Experiment Brian G. Tice June 27,
53 Tracking x Matching Efficiency Method ID clean μ in MINOS, point back to MINERvA Why not 100%? * big shower * pileup * deadtime MC overlaid with data Single event MC correction -4.6±2.5% Elba XII - The MINERνA Experiment Brian G. Tice June 27,
54 June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 54
55 June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 55
56 Double ratio of cross sections What cancels? Plastic cross sections are the same Assume that flux is the same for all targets Bin sizes are the same June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 56
57 Double ratio of cross sections reduced Double ratio gives us the ratio of lead to iron cross section, and with more cancellations to come... We know how many nucleons were used to build MINERνA (to ~2%) June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 57
58 Separable Efficiency/Acceptance Measured to true number of events Separate event selection efficiency into: Acceptance dependent on XY position Acceptance dependent of Z position Other effects specific to the nuclear target June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 58
59 Separable Efficiency/Acceptance Comparing samples with different acceptances Plastic reference target in the same region in Z Iron and Lead target are in the same region in Z Iron and its plastic reference occupy the same XY region Lead and its plastic reference occupy the same XY region June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 59
60 June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 60
61 June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 61
62 June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 62
63 Systematic Errors on dσ/dq 2 QE Unfolded Q 2 QE (GeV 2 ) June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 63
64 Neutrino Energy & Q 2 Area Normalization June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 64
65 Neutrino Energy & Q 2 Absolute Normalization June 27, 2012 Elba XII - The MINERνA Experiment Brian G. Tice 65
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