New Experiment in the Fermilab Neutrino Program A
New Experiment in the Fermilab Neutrino Program A High-Statistics -Nucleus Scattering Experiment Using an On-Axis, Fine-grained Detector in the Nu. MI Beam MINER A (Main INjector Expe. Riment v-A) Received Physics Approval from Fermilab PAC in April Jorge G. Morfín - Fermilab and Hugh Gallagher - Tufts
New Experiment in the Fermilab Neutrino Program A High-Statistics -Nucleus Scattering Experiment Using an On-Axis, Fine-grained Detector in the Nu. MI Beam MINER A (Main INjector Expe. Riment v-A) YOUR REGISTRATION AT HOTEL MINERVE DOES NOT BRING AUTOMATIC MEMBERSHIP IN MINERn. A !! Jorge G. Morfín - Fermilab and Hugh Gallagher - Tufts
Quantitative Study of Low-energy n-Nucleus Interactions Both HEP and NP collaborators D. Drakoulakos, P. Stamoulis, G. Tzanakos, M. Zois University of Athens, Greece G. Blazey, M. A. C. Cummings, V. Rykalin Northern Illinois University, De. Kalb, Illinois D. Casper University of California, Irvine, California W. K. Brooks, A. Bruell, R. Ent, D. Gaskell, , W. Melnitchouk, S. Wood Jefferson Lab, Newport News, Virginia E. Paschos University of 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. I. Niculescu. G. . Niculescu James Madison University, Harrisonburg, Virginia S. Boyd, D. Naples, V. Paolone University of Pittsburgh, Pennsylvania A. Bodek, H. Budd, J. Chvojka, P. de Babaro, S. Manly, K. Mc. Farland, I. C. Park, W. Sakumoto, R. Teng University of Rochester, New York R. Gilman, C. Glasshausser, X. Jiang, G. Kumbartzki, K. Mc. Cormick, 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 DISMAL As we saw Mini. Boo. Ne and K 2 K improving the situation at Lower Energies Typical samples of NC 1 - production CC ANL +n m- + p Gargamelle t t p n + (7 events) n n 0 (7 events) p p 0 (240 evts) n n 0 (31 evts) K 2 K and Mini. Boo. Ne t Starting a careful analysis of single 0 production. Strange Particle Production S. Zeller - Nu. Int 04 Gargamelle-PS - 15 L events. FNAL - ≈ 100 events ZGS - 7 events BNL - 8 events Larger NOMAD sample expected 4
The MINER A Detector OPTIONAL C, Fe and Pb Nuclear targets n Active target of scintillator bars (6 t total, 3 - 5 t fiducial) - M 64 PMT Surrounded by calorimeters t t upstream calorimeters are Pb, Fe targets (~1 t each) magnetized side and downstream tracker/calorimeter 5
Active Target Module Planes of strips are hexagonal t inner detector: active scintillator strip tracker rotated by 60º to get stereo U and V views t Pb “washers” around outer 15 cm of active target t outer detector: frame, HCAL, spectrometer t XUXV planes module Inner, fully-active strip detector Outer Detector magnetized 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 3. 3 cm 1. 7 cm technique pioneered by D 0 upgrade pre-shower detector 7
Location in Nu. MI Near Hall MINER A preferred running is as close as possible to MINOS, (without Muon Ranger), using MINOS as high energy muon spectrometer t If necessary, MINER A can run stand-alone elsewhere in the hall with the muon ranger 8
The Nu. MI Neutrino Beam and Near Detector Hall Main injector: 120 Ge. V 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 Nu. MI target, expect to know neutrino flux to ≈ ± 3 -4 %. 9
MINER A will have the statistics to cover a wide variety of important physics topics Assume 9 x 1020 POT: MINOS chooses 7. 0 x 1020 in LE n beam, 1. 2 x 1020 in s. ME and 0. 8 x 1020 in s. HE m 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 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 Main Physics Topics with Expected Produced Statistics Quasi-elastic Resonance Production Coherent Pion Production Nuclear Effects s. T and Structure Functions Strange and Charm Particle Production Generalized Parton Distributions 300 K events off 3 tons CH 600 K total, 450 K 1 p 25 K CC / 12. 5 K NC C: 0. 6 M, Fe: 1 M and Pb: 1 M 2. 8 M total /1. 2 M DIS event > 60 K fully reconstructed events (few K events? ) 10
A few MINER A Physics Results: Quasi-elastic Scattering MINER A: 300 K events off CH and over 100 K off of Fe and Pb S. Zeller - Nu. Int 04 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. MINER A Expected Mini. Boo. Ne And K 2 K measurements Expected Mini. Boo. Ne and K 2 K measurements 11
Coherent Pion Production MINERn. A: 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 . NC ( 0 production) significant background for m -->. e oscillation search • Data has not been precise enough to discriminate between several very different models. • Expect roughly (30 -40)% detection efficiency with MINER A. • Can also study A-dependence with MINER A Rein-Seghal Paschos. Kartavtsev MINER A Expected Mini. Boo. Ne and K 2 K measurements 12
Nuclear Effects MINER A: 2. 8 M events off CH, 600 K off C and 1 M events off of Fe and Pb Q 2 distribution for Sci. Bar detector Problem has existed for close to three years Larger than expected rollover at low Q 2 Mini. Boo. NE From J. Raaf (NOON 04) All “known” nuclear effects taken into account: Pauli suppression, Fermi Motion, Final State Interactions They have not included low- shadowing that is only allowed with axial-vector (Boris Kopeliovich at Nu. Int 04) Lc = 2 / (m 2 + Q 2) ≥ RA (not m. A 2) Lc 100 times shorter with m allowing low -low Q 2 shadowing ONLY MEASURABLE VIA NEUTRINO - NUCLEUS INTERACTIONS! MINERn. A WILL MEASURE THIS ACROSS A WIDE AND Q 2 RANGE WITH C : Fe : Pb 13
Importance for Neutrino Oscillation Experiments How Nuclear Effects enter Dm 2 Analyses Measurement of Dm 2 with MINOS Need to understand the relationship between the incoming neutrino energy and the visible energy in the detector Expected from MINER A t t t 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- shadowing with neutrinos 14
How MINER A 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 MINERn. A Measurements of s DQE = 5% DRES = 5, 10% (CC, NC) DDIS = 5% DCOH = 20% Without MINERn. A measurements of s, oscillation probability measurement could be limited by systematics! 15
Detector: Cost Summary and Schedule Beam and Experimental Hall already Exist! Costs are primarily scaled from experience of MINER A collaborators on CMS HCAL and MINOS $2. 55 M equipment $1. 41 M labor, EDIA $1. 54 M contingency (39% avg. ) Sum $5. 5 M Full project costs not updated since proposal (steel costs up) Schedule for full detector: ~ 26 - 30 months from start 16
Summary MINER A, a recently approved experiment, brings together the expertise of the HEP and NP communities to address the challenges of low-energy -A physics. MINER A will accumulate significantly more events in important exclusive channels across a wider E range than currently available. With excellent knowledge of the beam, s will be well-measured. With C, Fe and Pb targets MINER A will enable a systematic study of nuclear effects in -A interactions, known to be different than well-studied e-A channels. MINER A results will dramatically improve the systematic errors of current and future neutrino oscillation experiments. We welcome additional collaborators!! 17
- Slides: 17