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Hongyue Duyang University of South Carolina on Behalf of the Nova Collaboration Quy Nhon, Vietnam NUFACT 2016, 08/26/2016

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Hongyue Duyang University of South Carolina on Behalf of the Nova Collaboration Quy Nhon, Vietnam NUFACT 2016, 08/26/2016 Coherent π0 Measurement in the NOvA Near Detector Hongyue Duyang University of South Carolina On Behalf of the NOvA Collaboration Quy Nhon, Vietnam NUFACT 2016, 08/26/2016 What is Coherent? • Neutrinos can coherently scatter off target nucleus via charge/ neutral current interaction and produce pions. • The target nucleus stays in ground state. • Small momentum transfer. No quantum number (charge, spin, isospin) exchange. • Single forward-going pion in the final state, no vertex activity. 2 Why Coherent? • Coherent π0 is background to νe appearance measurement. • Coherent meson (π+/π-) production can be useful to the next generation oscillation experiment (DUNE) • Identical topology for neutrino and antineutrino. • Small nuclear effect. • Constraint on (anti)neutrino energy scale. • Physics in its own right: Partially Conserved Axial Current (PCAC) hypothesis, used in Rein-Seghal model and in most neutrino event generators such as GENIE. 3 Figure 1: Feynman Diagram of the neutrino induced coherent ⇡0 production. Coherent π0: World Measurement There are relatively few coherent π0 measurement, most suffer from large Results scaled to uncertainty. Carbon (A=12) Target Table 1: Summary of world coherent ⇡0 measurement. 40 2 Experiments A <E⌫ > (GeV) σ (10− cm /N ) σ/σ(⌫µ-CC) σ/σ(RS) Aachen-Padova 27 2 29 10 ± Gargamelle 31 3.5 31 20 ± CHARM 20 30 96 42 ± SKAT 30 7 79 28 4.3 1.5 ± ± 15’ BC 20 20 0.20 0.04 ± NOMAD 12.8 24.8 72.6 10.6 3.21 0.46 ± ± MiniBooNE 12 0.8 0.65 0.14 ± SciBooNE 12 0.8 0.9 0.20 +15.8 ± MINOS 48 4.9 77.6 17.5 − 4 2 The NOvA Near Detector NO�A NO�A Far Detector (Ash River, MN) MINOS Far Detector (Soudan, MN) A broad physics scope • 0.3 kton, 4.2mX4.2mX15.8m,Using ��→�e , � ͞ �→� ͞ e … ° Determine the � mass hierarchy ° Determine the � octant • 1 km from source, underground at Fermilab.23 ° Constrain �CP • PVC cells filled with liquid scintillatorUsing ��→�� , � ͞.� →� ͞ � … ° Precision measurements of 2 2 sin 2�23 and Dm 32. • Alternating planes of orthogonal (Exclude view. �23=�/4?) ° Over-constrain the atmos. sector (four oscillation channels) Also … ° Neutrino cross sections at the NO�A Near Detector ° Sterile neutrinos ° Supernova neutrinos Fermilab ° Other exotica Ryan Patterson, Caltech 4 cm ⨯ 6 cm 5 The NOvA Near Detector NOνA Near Detector Construction NO�A NO�A Far Detector (Ash River, MN) MINOS Far Detector (Soudan, MN) A broad physics scope • • Detector construction and instrumentation0.3 kton, completed4.2mX4.2mX15.8m, Aug. Using ��→�e , � ͞ �→� ͞ e … ° Determine the � mass hierarchy ° Determine the � octant 2014 • 1 km from source, underground at Fermilab.23 ° Constrain �CP • PVC cells filled with liquid scintillatorUsing ��→�� , � ͞.� →� ͞ � … • Neutrinos observed within seconds of turning on! ° Precision measurements of 2 2 sin 2�23 and Dm 32. • Alternating planes of orthogonal (Exclude view. �23=�/4?) ° Over-constrain the atmos. sector (four oscillation channels) Also … ° Neutrino cross sections at the NO�A Near Detector ° Sterile neutrinos ° Supernova neutrinos Fermilab ° Other exotica Ryan Patterson, Caltech 11 Jonathan M. Paley 4 cm ⨯ 6 cm 6 The NOvA Near Detector NOνA Near Detector Construction NO�A NO�A Far Detector (Ash River, MN) MINOS Far Detector (Soudan, MN) A broad physics scope • • Detector construction and instrumentation0.3 kton, completed4.2mX4.2mX15.8m, Aug. Using ��→�e , � ͞ �→� ͞ e … ° Determine the � mass hierarchy ° Determine the � octant 2014 • 1 km from source, underground at Fermilab.23 ° Constrain �CP • PVC cells filled with liquid scintillatorUsing ��→�� , � ͞.� →� ͞ � … • Neutrinos observed within seconds of turning on! ° Precision measurements of 2 2 sin 2�23 and Dm 32. • Alternating planes of orthogonal (Exclude view. �23=�/4?) ° Over-constrain the atmos. sector (four oscillation channels) Also … ° Neutrino cross sections at the NO�A Near Detector ° Sterile neutrinos ° Supernova neutrinos Fermilab ° Other exotica Ryan Patterson, Caltech 11 Jonathan M. Paley 4 cm ⨯ 6 cm 7 The NOvA Near Detector NOνA Near Detector Construction NO�A NO�A Far Detector (Ash River, MN) MINOS Far Detector (Soudan, MN) A broad physics scope • • Detector construction and instrumentation0.3 kton, completed4.2mX4.2mX15.8m, Aug. Using ��→�e , � ͞ �→� ͞ e … ° Determine the � mass hierarchy ° Determine the � octant 2014 • 1 km from source, underground at Fermilab.23 ° Constrain �CP • PVC cells filled with liquid scintillatorUsing ��→�� , � ͞.� →� ͞ � … • Neutrinos observed within seconds of turning on! ° Precision measurements of 2 2 sin 2�23 and Dm 32. • Alternating planes of orthogonal (Exclude view. �23=�/4?) ° Over-constrain the atmos. sector Results (four oscillation channels) Also … ° Neutrino cross sections at the NO�A Near Detector Bin to bin correlation matrix: ° Sterile neutrinos ° Supernova neutrinos Fermilab ° Other exotica Ryan Patterson, Caltech Mass weight of detector component: C12 Cl35 H1 Near DetectorTi48 O16 Others 0.3 kton 11 Jonathan M. Paley 66.8% 16.4% 10.5% 206 3.3%layers 2.6% 0.4% 4 cm ⨯ 6 cm 8 The measured inclusive cross section from Gargamelle, T2k, and NOvA as shown. There is also shown the predicted cross section for nue on carbon from GENIE. There is large correlation between the energy bins for NOvA results (see Top table). Our detector material is dominant by the carbon, chlorine, and hydrogen. 11/17 NuInt 2015 Xuebing Bu (Fermilab) 28 The NOvA Near Detector NOνA Near Detector Construction NO�A NO�A Far Detector (Ash River, MN) MINOS Far Detector (Soudan, MN) A broad physics scope • • Detector construction and instrumentation0.3 kton, completed4.2mX4.2mX15.8m, Aug. Using ��→�e , � ͞ �→� ͞ e … ° Determine the � mass hierarchy ° Determine the � octant 2014 • 1 km from source, underground at Fermilab.23 ° Constrain �CP • PVC cells filled with liquid scintillatorUsing ��→�� , � ͞.� →� ͞ � … • Neutrinos observed within seconds of turning on! ° Precision measurements of 2 2 sin 2�23 and Dm 32. • Alternating planes of orthogonal (Exclude view. �23=�/4?) ° Over-constrain the atmos. sector Results (four oscillation channels) Also … ° Neutrino cross sections at the NO�A Near Detector Bin to bin correlation matrix: ° Sterile neutrinos ° Supernova neutrinos Fermilab ° Other exotica Ryan Patterson, Caltech • Low-Z, fine-grained (1 plane ~ 0.15X0), highly-active tracking calorimeter, optimized for EM shower Mass weight of detector component: measurement. C12 Cl35 H1 Near DetectorTi48 O16 Others 0.3 kton 11 Jonathan M. Paley 66.8% 16.4% 10.5% 206 3.3%layers 2.6% 0.4% 4 cm ⨯ 6 cm 9 The measured inclusive cross section from Gargamelle, T2k, and NOvA as shown. There is also shown the predicted cross section for nue on carbon from GENIE. There is large correlation between the energy bins for NOvA results (see Top table). Our detector material is dominant by the carbon, chlorine, and hydrogen. 11/17 NuInt 2015 Xuebing Bu (Fermilab) 28 NuMI off-axis beam NO�A detectors are sited NuMI NuMI Beam Beam 14 mrad off the NuMI The NuMI Beam beam axis With the medium-energy NuMI tune, yields a narrow 2-GeV spectrum at the NO�A detectors ➔ Detectors are installed by being ➔ Detectorsoff beam are installed axis by being off beam axis on axis → Reduces NC and �e CC ➔ Narrow band beam peaked at 2 GeV 14 mrad backgrounds in the ➔ Narrow band beam peaked at 2 GeV (NO➔ �NearA) maximum oscillation oscillation analyses ➔ Near ➔maximumReduced oscillation NC background while maintaining high � flux at 2 GeV. ➔ Reduced➔ Electron NC background neutrino flux counts ~1% � of total flux. ➔ Electron neutrino flux counts ~1% of total flux. Ryan Patterson, Caltech 7 Fermilab JETP, August 6, 2015 • Narrow11/17 NuInt 2015band neutrino beam 1~3GeVXuebing Bu (Fermilab) peak at ~2GeV. 5 11/17 •NuIntDominated 2015 by νμ (94%), withXuebing small Bu (Fermilab) contribution from νe (1%). 5 10 Flux uncertainty NOvA Flux #Strategy of numu as a function of true neutrino energy at NOvA Near Detector. NOvA Simulation ➔ Two major uncertainties 1012 • νμ flux comes from pion and kaon decay. From all parents ➔ Beam transport (5%)• Uncertainties come from hadron 2 From π+ production and beam transport simulation. 1011 ➔ horn current, horn positions, beam direction, POT/cm 20 From K+ • Use external thick target (MIPP) and thin 10 beam spot size, and magnetic field × /6 10 target (NA49) data to constrain the hadron 10Φ Flux uncertainty➔ Hadron productionproduction uncertainty to ~10%. ➔ • ~5% uncertainty from beam transport. Using external data (see below table) 2 4 6 8 10 12 14 16 18 20 E (GeV) νµ ➔ Conservative systematic uncertainty is assigned ➔ Two major uncertainties for the region not covered by data. 2 Data p range p range Carbon Proton energy T Z Target (GeV) ➔ Beam transport (5%) (GeV) (GeV) NA49 pion 0 - 2 0 - 60 thin 158 ➔ horn current, horn positions, NA49beam kaon direction,0 - 1 0 - 27 thin 158 beam spot size, and magneticMIPP kaon/pion field ratio 0 - 2 27 - 60 thin 120 ➔ Hadron production MIPP pion 0 - 2 0 - 60 thick 120 NA49 pion cross section: Eur. Phys. J. C49 (2007) ➔ Using external dataNA49 (see kaon below cross section: table) G. Tinti Ph.D. Thesis MIPP kaon/pion ratio: A. Lebedev Ph.D. Thesis 11 ➔ Conservative systematicMIPP pion uncertaintyyield: Phys. Rev. is D assigned90, 032001 (2014) for the region not coveredFermilab by JETP data. seminar, 02/26/16 Xuebing Bu (Fermilab) 46 Data p range p range Carbon Proton energy T Z (GeV) (GeV) Target (GeV) NA49 pion 0 - 2 0 - 60 thin 158 NA49 kaon 0 - 1 0 - 27 thin 158 MIPP kaon/pion ratio 0 - 2 27 - 60 thin 120 MIPP pion 0 - 2 0 - 60 thick 120 NA49 pion cross section: Eur. Phys. J. C49 (2007) NA49 kaon cross section: G. Tinti Ph.D. Thesis MIPP kaon/pion ratio: A.
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