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Recent Results from MiniBooNE and SciBooNE

Recent Results from MiniBooNE and SciBooNE. Sam Zeller LANL FNAL Users Meeting June 3, 2009. will be telling you what’s new on the Booster  beamline at FNAL. Booster  Experiments. SciBooNE. to remind you of your friends on other side of the ring …

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Recent Results from MiniBooNE and SciBooNE

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  1. Recent Results fromMiniBooNE and SciBooNE Sam Zeller LANL FNAL Users Meeting June 3, 2009 • will be telling you what’s new on the Booster beamline at FNAL

  2. Booster  Experiments SciBooNE • to remind you of your • friends on other side • of the ring … • two  experiments make use • of 8 GeV Booster beam

  3. Booster  Experiments MiniBooNE SciBooNE • Cerenkov detector (CH2) • main goal is to study  oscillations • recently added a host of new  meas - NIM A599, 28 (2009) -

  4. Booster  Experiments MiniBooNE SciBooNE • start: August 2002 • - 6.9 x1020 POT  • - 5.1 x1020 POT  • currently running mode • recently approved for • extended running (+5x1020 POT) already surpassed our goal - thank you FNAL AD! - - NIM A599, 28 (2009) -

  5. Booster  Experiments SciBooNE SciBooNE • fine-grained tracking detector (CH) • (DOE-wide Pollution Prevention P2 Star Award) • main goal is dedicated (~ 1 GeV, T2K) • also serves as ND for MiniBooNE (shipped from Japan)

  6. Booster  Experiments SciBooNE SciBooNE • start: June 2007 • - 0.99 x1020 POT  • - 1.53 x1020 POT  • completed run Aug 2008 • detectors decommissioned 25% more data than requested - thank you FNAL AD! - (shipped from Japan)

  7. Booster  Experiments SciBooNE SciBooNE • start: June 2007 • - 0.99 x1020 POT  • - 1.53 x1020 POT  • completed run Aug 2008 • detectors decommissioned • impressive timeline • 3 years from formation to first result! (shipped from Japan)

  8. Outline • will go through some of recent results from two experiments • (a lot has happened in the past year!) •  oscillation results • from MiniBooNE in past year • brand new  measurements • from both MiniBooNE & SciBooNE briefly summarize three  oscillation updates from MB

  9. MiniBooNE Oscillations  e analysis • 1st, re-analysis of  mode • - review of bkg estimates • - extension down to 200 MeV • - increased stats • FNAL W&C August 2008  mode 6.5x1020 POT - PRL 102, 101802 (2009) -

  10. MiniBooNE Oscillations  e analysis • 1st, re-analysis of  mode • - review of bkg estimates • - extension down to 200 MeV • - increased stats • FNAL W&C August 2008  mode 6.5x1020 POT > 475 MeV:unchanged no LSND-like oscillations (2) - PRL 102, 101802 (2009) -

  11. MiniBooNE Oscillations  e analysis • 1st, re-analysis of  mode • - review of bkg estimates • - extension down to 200 MeV • - increased stats • FNAL W&C August 2008  mode 6.5x1020 POT > 475 MeV:unchanged no LSND-like oscillations (2) < 475 MeV: low energy excess persists (3 200-475 MeV) - PRL 102, 101802 (2009) -

  12. MiniBooNE Oscillations  e analysis (G. Karagiorgi) • 1st look at  mode data • unblinded in Nov 2008 • statistics are low • - no statement on LSND yet • no low energy excess?! • working on combined /  • + will benefit from more stats  mode 3.4x1020 POT FNAL W&C December 2008 - arXiv:0904:1958 [hep-ex] -

  13. MiniBooNE Oscillations  e analysis (G. Karagiorgi) • 1st look at  mode data • unblinded in Nov 2008 • statistics are low • - no statement on LSND yet • no low energy excess?! • working on combined /  • + will benefit from more stats  mode 3.4x1020 POT FNAL W&C December 2008 we’ll have to see how this picture evolves - arXiv:0904:1958 [hep-ex] -

  14. MiniBooNE Oscillations (K. Mahn) also performed search for and  disappearance  mode • set limits • carving out new regions • of parameter space • update incorporating SciBooNE • data is currently underway • (which should help further improve limits) FNAL W&C October 2008  mode - arXiv:0903:2465 [hep-ex] -

  15. Outline • now let’s switch gears … •  oscillation results • from MiniBooNE in past year • brand new  measurements • from both MiniBooNE & SciBooNE √ • rest of talk • all results <2 weeks • old! (NuInt09) • - a lot of firsts • (as you’ll see)

  16. Neutrino Cross Sections • of critical importance to • future  oscillation exps • which will be operating • in this few-GeV E range CNGS NOvA T2K DUSEL

  17. Neutrino Cross Sections • of critical importance to • future  oscillation exps • which will be operating • in this few-GeV E range quasi-elastic (QE) signal CNGS NOvA T2K DUSEL

  18. Neutrino Cross Sections • of critical importance to • future  oscillation exps • which will be operating • in this few-GeV E range NC 0 (background to e appearance) CC + (background to  disappearance) CNGS NOvA T2K DUSEL

  19. Neutrino Cross Sections • of critical importance to • future  oscillation exps • which will be operating • in this few-GeV E range • data are 20-30 years old • - 100’s of events,mostly D2 • - calcs we use are also old • situation have been suffering • with for past 30+ years • rapidly improving • (in large part due to efforts at FNAL) CNGS NOvA T2K DUSEL

  20. Neutrino Cross Sections • of critical importance to • future  oscillation exps • which will be operating • in this few-GeV E range • data are 20-30 years old • - 100’s of events,mostly D2 • - calcs we use are also old • situation have been suffering • with for past 30+ years • rapidly improving • (in large part due to efforts at FNAL) MB, SB nuclear targets! MINOS, MINERA

  21. Neutrino Cross Sections • of critical importance to • future  oscillation exps • which will be operating • in this few-GeV E range • data are 20-30 years old • - 100’s of events,mostly D2 • - calcs we use are also old • situation have been suffering • with for past 30+ years • rapidly improving • (in large part due to efforts at FNAL) MB, SB next talk! MINOS, MINERA

  22. Neutrino Cross Sections • of critical importance to • future  oscillation exps • which will be operating • in this few-GeV E range • data are 20-30 years old • - 100’s of events,mostly D2 • - calcs we use are also old • situation have been suffering • with for past 30+ years • rapidly improving • (in large part due to efforts at FNAL) MB, SB next talk! this talk MINOS, MINERA

  23. Booster  Flux Predictions • make heavy use of pBe   • data from HARP experiment • - Eur. Phys. J. C52, 29 (2007) - • - 8.9 GeV/c protons • - exact replica target (5% ) • caliber of data helped greatly • reduce  flux uncertainties • comprehensive  flux paper • - PRD 79, 072002 (2009) - (D. Schmitz)

  24. Booster  Flux Predictions • make heavy use of pBe   • data from HARP experiment • - Eur. Phys. J. C52, 29 (2007) - • - 8.9 GeV/c protons • - exact replica target (5% ) unable to reliably extract  measurements without this important input • caliber of data helped greatly • reduce  flux uncertainties • comprehensive  flux paper • - PRD 79, 072002 (2009) - (D. Schmitz)

  25.  W+ n n,p n,p Elastic Scattering Processes • CC QE scattering • NC elastic scattering • let’s start on the left and work our way up in energy …

  26.   W+ W+ n n n,p n,p n,p n,p Quasi-Elastic Scattering • CC QE scattering • NC elastic scattering • CC QE scattering • NC elastic scattering • “golden channel” (signal sample) • - cross section = # of signal events • - kinematics = looking for effects as function E •  experiments typically simulate with • relativistic Fermi Gas model (RFG) • Smith and Moniz, NP B43, 605 (1972)

  27.  W+ n n,p n,p Quasi-Elastic Scattering MiniBooNE: • CC QE scattering • NC elastic scattering • reconstruct muon (T,) • advantage of SB: can reconstruct both  and p

  28.  W+ n cos T (GeV) n,p n,p Quasi-Elastic Scattering MiniBooNE: • CC QE scattering • NC elastic scattering (T. Katori) d2 dTdcos • 146,070  QE events (76% purity, 27% ) • provide most complete information on •  QE scattering to date (full  kinematics)

  29.  W+ n cos T (GeV) n,p n,p Quasi-Elastic Scattering MiniBooNE: • CC QE scattering • NC elastic scattering (T. Katori) d2 dTdcos first measurement of double diff’l cross section in  QE scattering! • 146,070  QE events (76% purity, 27% ) • provide most complete information on •  QE scattering to date (full  kinematics)

  30.  W+ n n,p n,p Quasi-Elastic Scattering MiniBooNE: (T. Katori) • CC QE scattering • NC elastic scattering • updated shape fit results: MA=1.35  0.17 GeV •  • (with improved background constraint from MB data)

  31.  W+ n n,p n,p Quasi-Elastic Scattering MiniBooNE: (T. Katori) • CC QE scattering • NC elastic scattering • updated shape fit results: MA=1.35  0.17 GeV > MAD2=1.03 GeV, but consistent w/ K2K, MINOS

  32.  W+ n n,p n,p Quasi-Elastic Scattering MiniBooNE: • CC QE scattering • NC elastic scattering (T. Katori) RFG model with MA=1.35 GeV RFG model with MA=1.03 GeV (D2) (most widely used prediction for this process) • 35% higher than RFG w/ world avg MA=1.03 GeV • in better agreement with RFG w/ params • coming from shape only fit (MA=1.35 GeV)

  33.  W+ n n,p n,p Quasi-Elastic Scattering SciBooNE: can clearly resolve final state • CC QE scattering • NC elastic scattering μ p • reconstruct both and proton (2 track analysis) • 2,680  QE events (69% purity, 2.3% )

  34.  W+ n n,p n,p Quasi-Elastic Scattering SciBooNE: • CC QE scattering • NC elastic scattering (J. Alcaraz) preliminary • agrees with RFG prediction (with a higher MA) • ~ consistent with MiniBooNE measurement

  35.  W+ n n,p n,p Quasi-Elastic Scattering SciBooNE: • CC QE scattering • NC elastic scattering (J. Alcaraz) preliminary final results this summer! • agrees with RFG prediction (with a higher MA) • ~ consistent with MiniBooNE measurement

  36. Current Situation preliminary (T. Katori) RFG with MA=1.35 GeV RFG with MA=1.03 GeV MiniBooNE with total error NOMAD with total error (arXiv:0812.4543) SciBooNE with preliminary errors • MiniBooNE and SciBooNEin good agreement • 1st meas on nuclear target at low energy (E< 2 GeV) • both higher than recent QE from NOMAD?! all three on 12C ~

  37. Current Situation preliminary (T. Katori) RFG with MA=1.35 GeV RFG with MA=1.03 GeV MINOS, MINERA • importance of NuMI data (MINOS ND, MINERA)! • FNAL exps will make the defining statement on this  • (in doing so, will populate plot better than has ever been done in history)

  38. Current Situation preliminary (T. Katori) RFG with MA=1.35 GeV RFG with MA=1.03 GeV look forward to seeing how this turns out MINOS, MINERA • importance of NuMI data (MINOS ND, MINERA)! • FNAL exps will make the defining statement on this  • (in doing so, will populate plot better than has ever been done in history)

  39.  W+ n n,p n,p NC Elastic Scattering • CC QE scattering • NC elastic scattering • can study NC counterpart of this reaction • (MA, eventuallys) • MiniBooNE: 94,500  NC EL events • (65% purity, 26% ) • using this high quality data …

  40.  W+ n n,p n,p NC Elastic Scattering MiniBooNE: (D. Perevalov) • CC QE scattering • NC elastic scattering • in agreement w/ BNL E734 (1987); both on 12C • first to extend reach below Q2<0.4 GeV2

  41.  W+ n n,p n,p NC Elastic Scattering SciBooNE: (H. Takei) • CC QE scattering • NC elastic scattering (stat errors only) preliminary • adding important new data; also on 12C • 8,441  NC EL events (57% purity)

  42.  0 + W+ n,p n,p n,p n,p Single  Production • NC 0 production • CC + production • have both NC and CC counterpart

  43.  0 + W+ n,p n,p n,p n,p M(GeV) NC 0 Production • NC 0 production • CC + production • background to  e searches, 13 • final state can mimic a e interaction, 0  • very little historical data on this channel • cross section = • # of bkg events GGM, 240 NC 0 events Nucl. Phys. B135, 45 (1978)

  44.  0 + W+ n,p n,p n,p n,p NC 0 Production MiniBooNE: • NC 0 production • CC + production 0 world’s largest sample of NC 0 events (important constraint for e) 21,542  NC 0 events (73% purity, 36% ) 2,305  NC 0 events (58% purity, 36% )

  45.  0 + W+ n,p n,p n,p n,p NC 0 Production MiniBooNE: (C. Anderson) • NC 0 production • CC + production • absolutely normalized ( mode NC 0 data/MC = 1.10) • not so useful outside MB, so …

  46.    0 + W+ cos p(GeV)   n,p n,p n,p n,p cos p(GeV) NC 0 Production MiniBooNE: (C. Anderson) • NC 0 production • CC + production

  47.    0 + W+ cos p(GeV)   n,p n,p n,p n,p cos p(GeV) NC 0 Production MiniBooNE: (C. Anderson) • NC 0 production • CC + production first measurement of absolute NC 0 diff’l cross section

  48.  0 + W+ n,p n,p n,p n,p NC 0 Production SciBooNE: this is what a 0 event looks like in SB • NC 0 production • CC + production 0 • 545  NC 0 events (63% purity)

  49.  0 + W+ n,p n,p n,p n,p NC 0 Production SciBooNE: (Y. Kurimoto) • NC 0 production • CC + production preliminary (NC 0) (CC inclusive) = 7.7 ±0.6(stat) ±0.6(prelim syst) x10-2 • agrees with NEUT (6.8x10-2), K2K (6.40.7x10-2)

  50.  0 + W+ n,p n,p n,p n,p CC + Production • NC 0 production • CC + production • background to  disappearance • - + absorption = missing E = mis-estimate E • can spoil  disappearance signal • future experiments must know CC + • fraction to a few-% to measure m223,23 • (example: 5-10% is quoted goal for T2K) • want to know cross section as fcn E

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