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MiniBooNE Cross Section Results

MiniBooNE Cross Section Results. Interactions of the future!. Booster. Target Hall. decay region. absorber. target and horn. detector. FNAL Booster. dirt . Booster. primary beam. secondary beam. tertiary beam. (protons). (mesons). (neutrinos). MiniBooNE Neutrino Beam.

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MiniBooNE Cross Section Results

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  1. MiniBooNE Cross Section Results Interactions of the future! H. Ray, University of Florida

  2. Booster Target Hall decay region absorber target and horn detector FNAL Booster dirt Booster primary beam secondary beam tertiary beam (protons) (mesons) (neutrinos) MiniBooNE Neutrino Beam 8.9 GeV/c momentum protons extracted from Booster Directed on to a Beryllium Maximum rate of 5 Hz H. Ray, University of Florida

  3. decay region absorber target and horn detector FNAL Booster dirt nm Booster primary beam secondary beam tertiary beam (protons) (mesons) (neutrinos) MiniBooNE Neutrino Beam Magnetic horn with reversible polarity Focuses either neutrino or anti-neutrino parent mesons Collect data in neutrino, anti-neutrino mode, <Eν> ~700 MeV p- p+ p+ p- H. Ray, University of Florida

  4. MiniBooNE Detector • 12.2 meter diameter sphere • Puremineral oil, interactions on CH2 • 2 regions • Inner light-tight region, 1280 PMTs (10% coverage), 4π coverage • Optically isolated outer veto-region, 240 PMTs Nucl. Instr. Meth. A599 (2009) 28-46 H. Ray, University of Florida

  5. MiniBooNE Detector muon candidate Cerenkov detector  ring imaging for event reconstruction and PID, use particle decays for event ID (μ  e, π+ μ  e) Separate clusters of PMT hits in time Scintillation light enables NC EL measurement H. Ray, University of Florida

  6. MiniBooNE Detector e+ m 80% CCQE purity 25% efficiency m+ p n Either bound (12C) or quasi-free (H) e Cerenkov detector  ring imaging for event reconstruction and PID, use particle decays for event ID (μ  e, π+ μ  e) Separate clusters of PMT hits in time Scintillation light enables NC EL measurement H. Ray, University of Florida

  7. Measuring a Cross Section Flux of incoming particle beam Efficiencies of event selection Targets seen by beam • Precision xsecs require firm knowledge of flux! • Use external data for flux prediction  no in-situ tuning! • HARP: dedicated hadro-production expt • same beam E, exact replica target • BNL E910 • Overall 9% flux uncertainty, dominates error on xsec measurement M. Catanesiet al., Eur. Phys. J. C52, 29 (2007) H. Ray, University of Florida

  8. NC EL Neutrino Cross Sections Collected ν data 2002-2005, 2007 6.46e20 POT PRD 82, 092005 (2010) 8  cross section publications CC π+ PRL 103, 081801 (2009) PRD 83, 052007 (2011) 17.1% 23.5% 39.7% multi-π+ PRD 81, 092005 (2010) PRL 100, 032301 (2008) QE CC π0 PRD 83, 052009 (2011) NC π+/- PRD 81, 013005 (2010) PL B664, 41 (2008) NC π0 WS other Nuance MC Prediction H. Ray, University of Florida

  9. NC EL Neutrino Cross Sections Collected ν data 2002-2005, 2007 6.46e20 POT CC π+ multi-π+ QE CC π0 1st time full kinematics have been reported for many of these reaction channels! NC π+/- NC π0 WS other H. Ray, University of Florida

  10. Neutrino CC Exclusive Intrigue T. Katori, Indiana U, Ph.D. thesis • MiniBooNE 30% … but MB consistent with SciBooNE, MINOS, K2K • * NOMAD * NOMAD Fermi Gas (MA=1.35 GeV) Fermi Gas (MA=1.35 GeV) Fermi Gas (MA=1.03 GeV) Fermi Gas (MA=1.03 GeV) Tension between existing CC exclusive measurements, different expts Tension between CC exclusive measurements and theory, QE, π+, π0 nuclear interactions may be the key Need to understand CC scattering as a whole H. Ray, University of Florida

  11. Neutrino CC Inclusive Full 6.46e20 POT M. Tzanov, LSU MiniBooNE PRD 83, 012005, 2011 • Can’t do straight sum of exclusive channels; would sum systematic errors too! • Correlations exist between exclusive channels • Require at least 2 clusters of hits in time (μe) • ~344k events after cuts, purity of 96% PRELIMINARY Cross Section Coming Soon!! H. Ray, University of Florida

  12. Anti-neutrino Cross Sections Collected anti-ν data 2005-2006, 2008-2012 10.1e20 POT NC EL CC π- multi-π+ CC π0 13.8% NC π+/- 9.3% NC π0 29.6% PRD 81, 013005 (2010) 35.1% other QE PRD 84, 072005 (2011) Nuance MC Prediction WS ν H. Ray, University of Florida

  13. Anti-neutrino Wrong Sign Contamination • Large wrong-sign contribution to data sample • Largest in region not covered by HARP • Measure WS in-situ, using complementary methods • 1st measurement of WS in a non-magnetized detector! Phys. Rev. D84, 072005 (2011) H. Ray, University of Florida

  14. Anti-Neutrino CC Cross Sections World anti-ν CC results World anti-ν CCQE results J. Formaggio and G. Zeller, RMP, to be published (2012) MiniBooNE <Eν> = 700 MeV H. Ray, University of Florida

  15. Anti-neutrino CCQE Cross Section Full 10.1e20 POT J. Grange, University of Florida • Applying identical cuts as neutrino-mode CCQE PRD analysis • ~77,000 events pass CCQE cuts (not bkgsubtracted or efficiency corrected) • More than 10x the statistics of all other previously published anti-neutrino CCQE samples! • Next step: neutrino/anti-neutrino, exploit error correlations, narrow down correct model(s) Cross Section Coming Soon!! H. Ray, University of Florida

  16. Anti-neutrino NC Elastic Cross Section • Only 1 nucleon in final state • Below Cerenkov threshold • Reconstruct recoiling nucleon via a small amount of scintillation light • Uses Likelihood ratio to distinguish protons from low energy electrons • Largest bgd from NC π± where π is missed due to absorption in oil 12C ν or anti-ν p scintillation light H. Ray, University of Florida

  17. Anti-neutrino NC Elastic Cross Section 7.4e20 POT R. Dharmaplalan, University of Alabama • ~44,000 NCE events, 40% purity • World recordanti-ν NCE sample! • Next step: neutrino/anti-neutrino ratio Cross Section Coming Soon!! H. Ray, University of Florida

  18. Future Plans! • Neutrino CC inclusive (Martin Tzanov, LSU) • Antineutrino CCQE (Joe Grange, U Florida) • Antineutrino NC elastic (RanjanDharmapalan, U Alabama) • Neutrino CCQE with proton reconstruction (AthulaWickremasinghe, U Cincinnati) MiniBooNE has performed ν-nucleon scattering measurements in a variety of interaction channels! 8 publications so far! These analyses will complete the highly successful MiniBooNE cross section program H. Ray, University of Florida

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