P AUL N IENABER S AINT M ARY ’ S U NIVERSITY OF M INNESOTA FOR THE M INI B OO NE C OLLABORATION J ULY DPF2009
motivated by LSND observation of electron antineutrino events in a muon antineutrino beam 28 July 2009MiniBooNE Update -- DPF20092 PRD 64, (2001)
motivated by LSND observation of electron antineutrino events in a muon antineutrino beam MB start: muon neutrino beam different L, E; same L/E 28 July 2009MiniBooNE Update -- DPF20093
motivated by LSND observation of electron antineutrino events in a muon antineutrino beam MB start: muon neutrino beam different L, E; same L/E 6.9 E+20 POT neutrino mode 5.1 E+20 POT antineutrino mode 28 July 2009MiniBooNE Update -- DPF20094 about 2 mg of protons delivered to date!
motivated by LSND observation of electron antineutrino events in a muon antineutrino beam MB start: muon neutrino beam different L, E; same L/E 6.9 E+20 POT neutrino mode 5.1 E+20 POT antineutrino mode 28 July 2009MiniBooNE Update -- DPF20095 pion production (& hence flux) well constrained by HARP data/analysis Eur. Phys. J. C52, 29 (2007)
28 July 2009MiniBooNE Update -- DPF20096 Collaborators from Alabama, Bucknell, Cincinnati, Colorado, Columbia, Embry- Riddle, Fermilab, Florida, Illinois, Indiana, Los Alamos, LSU, MIT, Michigan, Princeton, Saint Mary’s, Virginia Tech, Yale
cross section measurements oscillation analyses 28 July 2009MiniBooNE Update -- DPF20097
28 July 2009MiniBooNE Update -- DPF neutrino CC cross sections when dinosaurs roamed the Earth (i.e., pre- MiniBooNE)
these numbers are of fundamental interest, but also relevant to future experiments 28 July 2009MiniBooNE Update -- DPF2009 9
these numbers are of fundamental interest, but also relevant to future experiments 28 July 2009MiniBooNE Update -- DPF NOvA T2K CNGS DUSEL
these numbers are of fundamental interest, but also relevant to future experiments focus here on two processes: CC QE (signal for oscillation) 28 July 2009MiniBooNE Update -- DPF
these numbers are of fundamental interest, but also relevant to future experiments focus here on two processes: CC QE (signal for oscillation) NC π 0 (background) 28 July 2009MiniBooNE Update -- DPF
LARGE SAMPLE! 146,070 QE events (76% purity, 27% ) [analyzed, after cuts] provide most complete information on QE scattering to date (full kinematics: E and ) 28 July 2009MiniBooNE Update -- DPF W+W+ n
(T. Katori) 28 July 2009MiniBooNE Update -- DPF W+W+ n T (GeV) cos (draft in preparation)
(T. Katori) 28 July 2009MiniBooNE Update -- DPF W+W+ n T (GeV) cos first double differential cross section for QE!! (draft in preparation)
28 July 2009MiniBooNE Update -- DPF W+W+ n - Q 2 shape fit results: M A =1.35 0.17 GeV - Higher value of M A also consistent with total vs. E - Consistent w/ K2K, MINOS, but not w/ M A D 2 =1.03 GeV
28 July 2009MiniBooNE Update -- DPF W+W+ n - Q 2 shape fit results: M A =1.35 0.17 GeV - Higher value of M A also consistent with total vs. E - Consistent w/ K2K, MINOS, but not w/ M A D 2 =1.03 GeV preliminary RFG = relativistic Fermi gas (v. Smith & Moniz, NP B43, 605 [1972]) model predictions, NOT fits
28 July 2009MiniBooNE Update -- DPF W+W+ n preliminary MiniBooNE and recent SciBooNE in good agreement Both higher than recent NOMAD QE ?! (all three on 12 C) look to MINOS and MINER A for more data MINOS, MINER A
28 July 2009MiniBooNE Update -- DPF n,p 00 0 LARGE SAMPLE! neutrino: 21,542 NC 0 events (73% purity, 36% ) antineutrino: 2,305 NC 0 events (58% purity, 36% )
28 July 2009MiniBooNE Update -- DPF n,p 00 p (GeV) cos cos (C. Anderson) [flux averaged] (draft in preparation)
28 July 2009MiniBooNE Update -- DPF n,p 00 p (GeV) cos cos (C. Anderson) first measurement of absolute NC 0 differential cross section [flux averaged] (draft in preparation)
28 July 2009MiniBooNE Update -- DPF M O R E ! ! ! -- CC + /CCQE: arXiv: [hep-ex] [S Linden, J Nowak] -- CC + : d /dT , d /d d 2 /dT d d /dT , d /d , d 2 /dT d ,d /dQ 2, (E ) [M Wilking] -- NC elastic: d /dQ 2 [D Perevalov]
28 July 2009MiniBooNE Update -- DPF result: In analysis region 475 < E < 3000 MeV, no evidence for oscillation (interpretation of LSND as simple two-neutrino oscillation excluded at 98% CL) Unexpected excess of events at low energy < 475 MeV PRL 98, (2007) 5.6 POT
28 July 2009MiniBooNE Update -- DPF update: improved statistics, better modelling of some background processes, and enhanced cuts on external interactions analysis threshold extended down to 200 MeV over 475 MeV: no change
28 July 2009MiniBooNE Update -- DPF update: improved statistics, better modelling of some background processes, and enhanced cuts on external interactions analysis threshold extended down to 200 MeV under 475 MeV: excess persists PRL 102, (2009)
28 July 2009MiniBooNE Update -- DPF statistics are low (does not include spring 2009 runs) -- no definitive statement on LSND yet -- no low energy excess?! __ - arXiv:0904:1958 [hep-ex] - (G. Karagiorgi) arXiv: [hep-ex] submitted to PRL
28 July 2009MiniBooNE Update -- DPF at 90%CL, no neutrino or antineutrino disappearance observed neutrino results agree with earlier experiments (CDHS + CCFR) antineutrino results map out new excluded region in parameter space arXiv: [hep-ex] (PRL in proof) mode (K. Mahn)
cross section results: unprecedentedly large samples allow measurements to be unpacked as differential rather than total flux understanding (HARP, &c.) allows absolute rather than ratio measurements some interesting unanswered questions (M A, &c.) oscillations: provenance of low energy excess remains an open question antineutrino results await more statistics 28 July 2009MiniBooNE Update -- DPF200928
combined antineutrino/neutrino appearance analysis combined MiniBooNE/SciBooNE disappearance analysis three more years antineutrino running 28 July 2009MiniBooNE Update -- DPF200929
combined antineutrino/neutrino appearance analysis combined MiniBooNE/SciBooNE disappearance analysis three more years antineutrino running MicroBooNE: liquid argon TPC in BNB line, upstream of MiniBooNE upgrade to BooNE: second detector 28 July 2009MiniBooNE Update -- DPF see B Fleming Friday morning plenary!