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Recent Results from MiniBooNE and SciBooNE

Discover the latest findings from the MiniBooNE and SciBooNE experiments regarding neutrino oscillations and sigma measurements. The experiments utilize the Booster beamline at FNAL and share significant insights. Explore the implications and advancements in the field of particle physics.

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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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