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A High-Statistics n -Nucleus Scattering Experiment Using an On-Axis, Fine-grained Detector

New Experiment in the Fermilab Neutrino Program. A High-Statistics n -Nucleus Scattering Experiment Using an On-Axis, Fine-grained Detector in the NuMI Beam. MINER n A ( M ain IN jector E xpe R iment v-A ) Received Physics Approval from Fermilab PAC in April. Jorge G. Morfín - Fermilab

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A High-Statistics n -Nucleus Scattering Experiment Using an On-Axis, Fine-grained Detector

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  1. New Experiment in the Fermilab Neutrino Program A High-Statistics n-Nucleus Scattering Experiment Using an On-Axis, Fine-grained Detector in the NuMI Beam MINERnA(Main INjector ExpeRiment v-A) Received Physics Approval from Fermilab PAC in April Jorge G. Morfín - Fermilab and Hugh Gallagher - Tufts

  2. Quantitative Study of Low-energy n-Nucleus Interactions Both HEP and NP collaborators D. Drakoulakos, P. Stamoulis, G. Tzanakos, M. Zois University of Athens, Athens, Greece D. Casper University of California, Irvine, California E. Paschos University of Dortmund, Dortmund, Germany D. Boehnlein, D. A. Harris, M. Kostin, J.G. Morfin, P. Shanahan, P. Spentzouris Fermi National Accelerator Laboratory, Batavia, Illinois M.E. Christy, W. Hinton, C.E .Keppel Hampton University, Hampton, Virginia R. Burnstein, A. Chakravorty, O. Kamaev, N. Solomey Illinois Institute of Technology, Chicago, Illinois S.Kulagin Institute for Nuclear Research, Moscow, Russia I. Niculescu. G. .Niculescu James Madison University, Harrisonburg, Virginia G. Blazey, M.A.C. Cummings, V. Rykalin Northern Illinois University, DeKalb, Illinois W.K. Brooks, A. Bruell, R. Ent, D. Gaskell,, W. Melnitchouk, S. Wood Jefferson Lab, Newport News, Virginia S. Boyd, D. Naples, V. Paolone University of Pittsburgh, Pittsburgh, Pennsylvania A. Bodek, H. Budd, J. Chvojka, P. de Babaro, S. Manly, K. McFarland, I.C. Park, W. Sakumoto, R. Teng University of Rochester, Rochester, New York R. Gilman, C. Glasshausser, X. Jiang, G. Kumbartzki, K. McCormick, R. Ransome Rutgers University, New Brunswick, New Jersey H. Gallagher, T. Kafka, W.A. Mann, W. Oliver Tufts University, Medford, Massachusetts J. Nelson William and Mary College, Williamsburg, Virginia Red = HEP, Blue = NP, Green = Theorist

  3. Motivation: Detailed Knowledge of low-energy Neutrino-Nucleus Interactions DISMALAs we saw MiniBooNe and K2K improving the situation at Lower Energies Typical samples of NC 1-p production • ANL •  p n + (7 events) •  n n 0 (7 events) • Gargamelle •  p p 0 (240 evts) •  n n 0 (31 evts) • K2K and MiniBooNe • Starting a careful analysis of single 0 production. Strange Particle Production • Gargamelle-PS - 15 L events. • FNAL - ≈ 100 events • ZGS - 7 events • BNL - 8 events • Larger NOMAD sample expected CC n + n m- + p S. Zeller - NuInt04

  4. n The MINERnA Detector OPTIONAL • Active target of scintillator bars (6t total, 3 - 5 t fiducial) - M64PMT • Surrounded by calorimeters • upstream calorimeters are Pb, Fe targets (~1t each) • magnetized side and downstream tracker/calorimeter C, Fe and Pb Nuclear targets

  5. Active Target Module • Planes of strips are hexagonal • inner detector: active scintillator strip tracker rotated by 60º to get stereo U and V views • Pb “washers” around outer 15 cm of active target • outer detector: frame, HCAL, spectrometer • XUXV planes  module Inner, fully-activestrip detector Outer Detectormagnetized sampling calorimeter

  6. Performance of the Detector:Tracking in Active Target • Coordinate resolution from triangular geometry is excellent • s ~ 2-3 mm in transverse direction from light sharing • technique pioneered by D0 upgrade pre-shower detector 3.3cm 1.7cm

  7. Location in NuMI Near Hall • MINERnA preferred running is as close as possible to MINOS, (without Muon Ranger), using MINOS as high energy muon spectrometer • If necessary, MINERnA can run stand-alone elsewhere in the hall with the muon ranger

  8. The NuMI Neutrino Beam Main injector: 120 GeV protons 1 km 110 m Move target only Move target and Second horn With E-907(MIPP) at Fermilab to measure particle spectra from the NuMI target,expect to know neutrino flux to ≈±3-4 %.

  9. MINERnA will have the statistics to cover a wide variety of important n physics topics Assume9x1020 POT: MINOS chooses 7.0x1020 in LE n beam, 1.2x1020 in sME and 0.8x1020 in sHE Typical Fiducial Volume = 3-5 tons CH, 0.6 ton C, ≈ 1 ton Fe and ≈ 1 ton Pb 3 - 4.5 M events in CH 0.5 M events in C 1 M events in Fe 1 M events in Pb nm Event Rates per fiducial ton Process CC NC Quasi-elastic 103 K 42 K Resonance 196 K 70 K Transition 210 K 65 K DIS 420 K 125 K Coherent 8.4 K 4.2 K TOTAL 940 K 305 K Main Physics Topics with Expected Produced Statistics • Quasi-elastic 300 K events off 3 tons CH • Resonance Production 600 K total, 450 K 1p • Coherent Pion Production 25 K CC / 12.5 K NC • Nuclear Effects C:0.6M, Fe: 1M and Pb: 1 M • sT and Structure Functions 2.8 M total /1.2 M DIS event • Strange and Charm Particle Production > 60 K fully reconstructed events • Generalized Parton Distributions(few K events?)

  10. A few MINERnA Physics Results:Quasi-elastic ScatteringMINERnA: 300 K events off CH and over 100 K off of Fe and Pb • Cross-section important for understanding low-energy neutrino oscillation results and needed for all low energy neutrino monte carlos used in neutrino oscillation analyses. • Constrained kinematics help measure final state interactions off three different nuclear targets. S. Zeller - NuInt04 MINERnA Expected MiniBooNe And K2K measurements Expected MiniBooNe and K2K measurements

  11. Coherent Pion ProductionMINERnA: 25 K CC / 12.5 K NC events off C - 8.3 K CC/ 4.2 K NC off Fe and Pb • Characterized by a small energy transfer • to the nucleus, forward going p.NC (p0 production)significant background for nm --> .ne oscillation search • Data has not been precise enough to discriminate between several very different models. • Expect roughly (30-40)% detection efficiency with MINERnA. • Can also study A-dependence with MINERnA Rein-Seghal Paschos- Kartavtsev MINERnA Expected MiniBooNe and K2K measurements

  12. Nuclear Effects MINERnA: 2.8 M events off CH, 600 K off C and 1 M events off of Fe and Pb Q2 distribution for SciBar detector Problem has existed for close to three years • All “known” nuclear effects taken into account: • Pauli suppression, Fermi Motion, Final State Interactions • They have not included low-n shadowing that is only • allowed with axial-vector (Boris Kopeliovich at NuInt04) • Lc = 2n / (mp2 + Q2) ≥ RA (not mA2) • Lc100 times shorter with mp allowing low n-low Q2 shadowing • ONLY MEASURABLE VIA NEUTRINO - NUCLEUS • INTERACTIONS! MINERnA WILL MEASURE THIS • ACROSS A WIDE n AND Q2 RANGE WITH C : Fe : Pb Larger than expected rollover at low Q2 MiniBooNE From J. Raaf (NOON04)

  13. Importance for Neutrino Oscillation ExperimentsHow Nuclear Effects enter Dm2 Analyses Measurement of Dm2 with MINOS • Need to understand the relationship between the incoming neutrino energy and the visible energy in the detector • Expected from MINERnA • Improve understanding of pion and nucleon absorption • Understand intra-nuclear scattering effects • Understand how to extrapolate these effects from one A to another • Improve measurement of pion production cross-sections • Understand low-n shadowing with neutrinos

  14. How MINERnA Would Help Off-axis Experiments Total fractional error in the background predictions as a function of Near Detector off-axis Angle Current Accuracy of Low-energy Cross-sections DQE = 20% DRES = 40% DDIS = 20% DCOH = 100% With MINERnA Measurements of s DQE = 5% DRES = 5, 10% (CC, NC) DDIS = 5% DCOH = 20% Without MINERnA measurements of s, oscillation probability measurement could be limited by systematics!

  15. Detector: Cost Summary and ScheduleBeam and Experimental Hall already Exist! • Costs are primarily scaled from experience of MINERnA collaborators on CMS HCAL and MINOS • $2.55Mequipment • $1.41Mlabor, EDIA • $1.54Mcontingency(39% avg.) • Sum $5.5M • Full project costs not updated since proposal (steel costs up) • Schedule for full detector: ~ 26 - 30 months from start

  16. Summary • MINERnA, a recently approved experiment, brings together the expertise of the HEP and NP communities to address the challenges of low-energy n-A physics. • MINERnA will accumulate significantly more events in important exclusive channels across a wider En range than currently available. With excellent knowledge of the beam, s will be well-measured. • With C, Fe and Pb targets MINERnA will enable a systematic study of nuclear effects in n-A interactions, known to be different than well-studied e-A channels. • MINERnA results will dramatically improve the systematic errors of current and future neutrino oscillation experiments. • We welcome additional collaborators!!

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