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A status report on the MINER n A neutrino Experiment

A status report on the MINER n A neutrino Experiment. Steven Manly, University of Rochester Representing the MINER  A collaboration HEP 2012, Valparaiso, Chile January 4-10 , 2012. What is MINER n A ?. Main Injector ExpeRiment -A.

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A status report on the MINER n A neutrino Experiment

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  1. A status report on the MINERnA neutrino Experiment Steven Manly, University of Rochester Representing the MINERA collaboration HEP 2012, Valparaiso, Chile January 4-10 , 2012

  2. What is MINERnA? Main Injector ExpeRiment-A • A fully active, high resolution detector designed to study neutrino reactions in detail • Sited upstream of the MINOS near detector in the NuMI beam at Fermilab • Will study neutrino reactions on a variety of nuclei HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  3. The MINERnA CollaborationMain Injector ExpeRimentn-A • University of Athens, Athens, Greece • Centro Brasileiro de PesquisasFisicas, Rio de Janeiro, Brazil • UC Irvine, Irvine, CA, USA • Fermi National Accelerator Lab, Batavia, IL, USA • University of Florida, Gainsville, FL, USA • Universidad de Guanajuato, Guanajuato, Mexico • Hampton University, Hampton, VA, USA • Institute for Nuclear Research, Moscow, Russia • James Madison University, Harrisonburg, VA, USA • Mass. Coll. of Liberal Arts, North Adams, MA, USA • University of Minnesota-Duluth, Duluth, MN, USA • Northwestern University, Evanston, IL, USA • Otterbein College, Westerville, OH, USA • University of Pittsburgh, Pittsburgh, PA, USA • Pontificia Universidad Catolica del Peru, Lima, Peru • University of Rochester, Rochester, NY, USA • Rutgers University, Piscataway, NJ, USA • Universidad Tecnica Federico Santa Maria, Valparaiso, Chile • University of Texas, Austin, TX, USA • Tufts University, Medford, MA, USA • Universidad Nacional de Ingenieria, Lima, Peru • College of William & Mary, Williamsburg, VA, USA A collaboration of about 80 nuclear and particle physicists from 21 institutions Note the large Latin American contribution! HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  4. n interaction physics MINOS T2K CNGS • noscillation experiments need to understand n reactions on nuclear targets in the 1-10 GeV region • Older Data Problematic • 20-50% uncertainties, depending on process • The nuclear physics was not well understood NOvA Shown coverages are “powerpoint approximate” LBNE MINERvA Plot from G. Zeller Single p HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  5. CCQE – recent results • Inconsistency between MiniBooNE/SciBooNE and NOMAD results • Gap falls in midst of MINERA coverage Aguilar-Arevalo et al., PRD 81, 092005 (2010) ArXiv:0812.4543 Acaraz et al., AIP Conf. Proc. 1189.145 (2009) HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  6. MINERnA • Precision measurement of cross sections in the 1-10 Gev region • Understand the various components of cross section both CC and NC • CC & NC quasi-elastic • Resonance production, D(1232) • Resonance↔deep inelastic scatter, (quark-hadron duality) • Deep Inelastic Scattering • Study A dependence of n interactions in a wide range of nuclei • Need high intensity, well understood n beam with fine grained, well understood detector. HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  7. NuMIBeamline Muon Monitors νμ Absorber Decay Pipe Horns Target μ+ π+ • 120 GeV P Beam → C target → π+− & K+ − • Have roughly 35x1012 protons on target (POT) per spill at 120 GeV with a beam power of 300-350 kW at ~0.5 Hz • 2 horns focus π+ and K+ only • Mean En increased by moving target and one horn • π+ and K+ → μ+νμ • Absorber stops hadrons not m • m absorbed by rock, n → detector 18 m 5 m Rock 30 m Hadron Monitor 10 m 12 m 675 m figure courtesy Ž. Pavlović HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  8. Flux determination Muon Monitors νμ Absorber Decay Pipe Horns Target μ+ π+ Use external hadron production data Monitor the muon flux 18 m 5 m Rock 30 m Hadron Monitor 10 m 12 m 675 m examples Use flexible beam design, take data in special runs with different beam configurations (vary target position and horn currents) figure courtesy Ž. Pavlović Target at 10 cm 0 kA Target at 250 cm 200 kA • Goal is better than 10% in absolute flux and 7% on shape HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  9. The detector MINERA “modules” HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  10. The detector (types of modules) Inner detector • Target Module (5 total): • Layer of target material (Fe, C or Pb) • Layer of scintillator • Tracker Module(84 total): • 2 layersscintillator • 3.71 interaction lengths • ECal module (10 total): • 2 sheets of lead • 2 layers of scintillator • 8.3 rad lengths. • HCal module (20 total): • Layer of Fe • Layer of scintillator • 3.7 interaction lengths. Outer detector – slots instrumented with scintillator (HAD calorimetry) Lead ring on outer edge of inner detector forms an EM calorimeter MINERvA module under construction HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  11. The detector • MINERA received US DOE “CD-3 approval” in Nov. 2007 • Construction of the full detector completed in spring 2010 • He and H2O targets added in 2011 (funded by an NSF MRI)  From NuMI HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  12. The detector • MINERA received US DOE “CD-3 approval” in Nov. 2007 • Construction of the full detector completed in spring 2010 • He and H2O targets added in 2011 (funded by an NSF MRI) Active Scintillator Modules Tracking Region Liquid Helium Water  From NuMI HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012 Carbon Iron Lead

  13. The detector (nuclear targets) Water target He target 5 Nuclear Targets Fe Pb C • NUGEN MC • Only  • not acceptance corrected • inside fiducial volume 5 nuclear targets + water target interspersed in target region with tracking modules between Helium target upstream of detector Approved (for Physics) near million-event samples (41020 POT LE beam + 121020 POT in ME beam) HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  14. MINERnAmSpectrometer Installed and tested long ago  (Also known as the MINOS Near Detector) HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  15. Muon Detection “MINOS-matched” muons Energy threshold ~2 GeV. Good angular acceptance up to scattering angles of about 10 degrees, with limit of about 20 degrees Muons stopped in MINERnA can also be used (but no charge determination). HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  16. Data in this plot constrained to have vertex in tracker or ECAL section HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  17. MINERnA Events • Showing X view n QE DIS Anti-n QE NC p0 D++ HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  18. Summary of detector capability • Good tracking resolution (~3 mm) • Calorimetry for both charged particles and EM showers • Containment of events from neutrinos < 10 GeV (except muon) • Muon energy and charge measurement from MINOS • Particle ID from dE/dx and energy+range • But no charge identification except muons into MINOS More events HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  19. MINERnAdata collection “special runs” in differing beam configurations to help with flux uncertainties MINERA has been running with high efficiency and collected data in both the neutrino and antineutrino (LE) mode Less than 100 dead channels out of 32k channels HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  20. CC Sample • Approved for4 × 1020 POT LE beam12 × 1020 POT ME beam 0.9 x 1020 special runs Actual exposures may vary • Yield: ~14M (CC events) 9M in scintillator NuMI Low Energy Beam (neutrinos) Quasi-elastic Resonance production Resonance to DIS transition region DIS Low Q2 region and structure functions Coherent Pion Production charm / strange production 0.8 M 1.7 M 2.1 M 4.3 M CC 89k, NC 44k 230 k • MC (assumes all ) • not acceptance corrected • inside fiducial volume HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  21. Anti-n Inclusive CC Data • Track in MINERnA which matches a track in MINOS, this imposes few GeV cut • Require inside fiducial volume • X Y vertex distribution • Momentum from MINOS + dE/dxin MINERnA Preliminary preliminary HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  22. Distributions in Anti-n BeamAnti-n CC, Data vs MC • 4.04 × 1019 POT in anti-n mode • MC generator GENIE v 2.6.0 • GEANT4 detector simulation • 2 × 1019 POT MC , LE Beam MC anti-n flux, untuned • Area normalized • Require reconstructed muon in MINOS HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  23. Distributions in Anti-n Beam n CC, Data vs MC • n Distributions same conditions as before • Very good agreement between Data and MC (out of the box) HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  24. MINERnA Test Beam Steel Absorber Lead Absorber Scintillator Plane • In order to make precise measurements we need a precise low energy calibration • 40 planes, XUXV,1.07 m square • Reconfigurable can change the absorber configuration. Plane configurations: • 20ECAL-20HCAL • 20Tracker-20ECAL • Test beam has 0.4 to 1.2 GeVpions for LE hadron calibration • Am told test beam is available if needed p PMT box Front End Electronics MINERA test beam run in June-July, 2010 HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  25. 16 GeVpion beam on copper target

  26. Test Beam p • 20 ECAL 20 HCAL configuration • 1.35 GeV interacting in HCAL HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  27. MINERnA Test Beam HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  28. Preliminary studies of n CCQE events • Recent MiniBooNE data for QE scattering on carbon appears inconsistent with NOMAD data • MiniBooNE is about 30% higher than expected, and MA for best fit differs substantially from that for NOMAD. Figures from Bodek, Budd, and Christy, Eur. Phys. Jour. C 71 (2011) 1726. QE +np-nh random phase approx. meson exchange current model, Martini et al., Phys. Rev. C 80:065501, 2009 and Phys. Rev. C81:045502, 2010 HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  29. Event Selection for n QE Require 1 positive MINOS-matched muon in the event Recoil energy is nominally Q2/2mprot – require recoil energy to be less than this value. HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  30.  QE candidates HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  31.  CCQE results • Inferred antineutrino energy spectrum • Assumes QE kinematics (and nucleons at rest)

  32. Inclusive CC cross-section ratios • First step in studies with nuclear targets: inclusive cross section ratios of various nuclei. • Ratio depends both on the relative neutron to proton cross section, and possible nuclear modifications to the total cross section. • Expected ratios per kg for En > 2 GeV • Pb/Fe = 1.04, Pb/CH = 1.10, Fe/CH = 1.05 • Analysis shown here done with neutrino data, on most downstream Pb/Fe target

  33. Inclusive CC cross-section ratios Require: 1 muon track, matched to a negative charge MINOS track Z position of muon vertex in nuclear target/first module downstream of target Fiducial cut on muon vertex HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  34. Inclusive CC cross-section ratios Backgrounds originate from neutrino interactions in scintillator upstream and downstream of the target Use active plastic scintillator reference target for background, acceptance studies MC: 11.2e20 POT Data: 9.1e19 POT HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  35. Inclusive CC cross-section ratios Discrepancies between data and MC result primarily from untuned flux model MC: 11.2e20 POT Data: 9.1e19 POT HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  36. MINERA Schedule • Downstream half of detector installed Nov 2009 – began running with anti-neutrinos • Low energy beam – average energy ~4 GeV • Detector completed March 2010, began running with neutrinos • Low energy beam – will run until spring 2012 • 4x1020 POT • Spring 2012- spring 2013 – shutdown for NuMI upgrade for NOvA • 2013-2016 continued neutrino running • Medium energy beam – average energy ~8 GeV • 12x1020 POT HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  37. Summary • MINERA is a high statistics, high-resolution neutrino experiment in the NuMI beam at Fermilab • MINERnA began data taking with a partially complete detector in October 2009, and with the full detector in March 2010. • Detector is working well. • Initial data analysis of inclusive cross sections gives Fe/Pb ratio roughly within expectations • Initial measurement of QE shape generally as expected with MA of 0.99. • Many more results coming soon … HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  38. MINERA analysisprojects underway • Incomplete and may change … but gives you an idea of what’s to come. Many other topics on our “ToDo” list. Fun for years to come … • CCQE in plastic (carbon) and nuclear targets, d/dQ2 • Nuclear target cross section ratios • NC elastic production • CC o production • NC and CC coherent charged and neutral  production • Beam flux • e content of NuMI beam • e – electron scattering • e production at low energy • Exclusive, inclusive, and coherent  production in plastic and nuclear targets • CC inclusive cross section (plastic and nuclear targets) HEP 2012, Valparaiso, Chile, Jan. 4-10, 2012

  39. Backup slides

  40. The MINERnA Collaboration

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