Exclusive Neutrino Cross Sections From Mi MiniBooNE Martin Tzanov - - PowerPoint PPT Presentation
Exclusive Neutrino Cross Sections From Mi MiniBooNE Martin Tzanov University of Colorado PANIC 2008, 9-14 November, Eilat, ISRAEL Neutrino no Cross Sec ections Today ay CC world data CC world data Precise knowl wledge ge
Martin Tzanov, PANIC 2008
wledge ge need eded for pr prec ecis ise e oscillat ation
ion we well mea easured ab above 20 20 GeV.
ew meas asurem emen ents be below 20 GeV.
0-30 0 years old ld bub ubble chamber ex expe periments (mos
utral cur urrent nt cross sections are e even less und nderstood.
CC world data CC world data
T2K 2K, BooNE NE K2K, NO NOvA MINOS
Martin Tzanov, PANIC 2008
DETECTOR
41 m downstream am of tar arget et, 3 m overburden
here( e(10 m “fiducial al”)
00 t (450 t fidu ducia ial) of pu pure e mineral al oil l (CH2)
280 inner and 24 240 vet eto ph photot
bes
The Neutrino Flux Prediction at Mini niBooNE, Submitted to PRD [arXiv:0806:1449]
BEAM:
niBooNE ex extracts protons from the 8 GeV eV Booster deliver ered d to a 1.7l Be target inserted into
gnetic ic horn (2.5 kV, 174 4 kA) that at (in increa eases es flux ux 6 times)
900k in interactio ions in n fiducial volume in ν mode with h small an anti- i-ν componen ent.
90k int nteractio ions in fidu ducial vol
anti-ν mode with h 30% 0% ν component nt.
The e MiniBooNE Detector, Accepted by NIM A [arXiv:0806.4201]
ν mode flux - foc
usin ing π+ ant nti-ν mode flux - focusing g π-
Martin Tzanov, PANIC 2008
µ
Neutrino oscil illations:
nt at at this en energy.
en channe nel for dis isap appearan ance searches. Neutrino cross section:
ides inf nformatio ion about nucle lear structur ure.
bubble chamber experiments (D2).
ar target ets – hi higher MA
1.20 ± 0.12) GeV, PRD RD 74, 4, 052 52002 (2006) 6)
ar (12C) MA= (1.14 14 ± 0.11) 1) GeV eV MiniBooNE NE has coll llected d 198, 8,000 00 events after cuts.
+ → +
−
µ ν µ
2 2 2
A A A
+ =
Martin Tzanov, PANIC 2008
µ
ed by the stoppe ped muon n decay ay elec ectron
4% pur urit ity, 35% efficiency
e θµ, Tµ → Eν, Q2
hed li line) dat ata disagree e in Q2
butio ion using ng effective e parameters MA and nd κ (Pauli li bl blocking parameter). MA = (1.23 23 ± 0.20) GeV, (high Q2) κ = 1.01 019 ± 0.011, (low Q2)
gree ees wit ith nu nuclear target measurements.
) cos ( 2
2 2 2
µ µ µ ν µ
θ
p E E m q Q
− + − = − =
Measurement of Muon n Neutrino Quas asi- i- Elastic Scat atter erin ing on n Car arbo bon, PRL RL 10 100, 03231 310 (200 008)
Martin Tzanov, PANIC 2008
bef efore correctio ion after correction
2 2 2
µ µ µ ν µ
θ
− + − = − =
eement with h data for both cosθµ and Tµ Data/MC ratios
µ
Martin Tzanov, PANIC 2008
µ
apply MA and κ from ν mode. e.
gree eement with dat ata.
+ → +
+
µ ν µ
gree eement in othe her kinematic var ariables PRELIMINARY
PRELIMINARY
Martin Tzanov, PANIC 2008
Neutrino oscillation:
rtant for
earance sear arches es
if one ne of
elow threshold ld π ν ν π ν ν
µ µ µ µ
+ + → + + + → +
Wor
d data on cohe herent production Neutrino cros
g coheren ent and res esonant produ duction.
elow 2GeV eV.
ein – Sehg hgal mod
predi diction. n. resonant coherent
Martin Tzanov, PANIC 2008
lent π0 con
nmen ent (4π)
ampl ple – 28,600 events, 97% % pur urit ity, 40 40% efficie iency
eighting of mom
entum distribut ution
gives ver ery go good agreement nt in in other kinematic variabl bles.
erent nt angular ar distrib ibution
coh
uch more forward
nant and coherent fractio ions yield lds [19 19.5±1. 1.1(stat at)±2.5( 5(syst)]% coh
action.
First Observation of Coherent π0 Production in Neutrino Nucleus Int nteraction
Phys Lett B.664, 41 (2008)
Martin Tzanov, PANIC 2008
µ
dence of
heren ent events.
π ν ν
µ µ
+ + → +
2700 even ents af after cuts
irst measurement at at 1GeV comparison w/o coherent nt fraction For
e poster 77 7 by V. Nguyen en
Martin Tzanov, PANIC 2008
+ − + −
+ + → + + + → + π µ ν π µ ν
µ µ
νµ CCπ+ world data Neu eutrino oscillat ation: n:
nd for νµ dis isappear aranc nce
ed in n the nuc ucle leus
ifies es νµQE energy spec ectrum um
n larger system emat atic on os
llation
parameters.
eed to kno now νµCCπ+/νµCCQE(Eν) to
Neu eutrino cross section:
ld bub ubble e chamber da data a (H2, D2).
erim imen ents.
idence of no cohe heren ent com
ponent at low ener ergy gy. resonant coherent Also talk by SciB iBooNE – Y. Nak akaj ajima
Martin Tzanov, PANIC 2008
iBooNE measurement nt is is consisten ent with previou
d Rein- n-Sehg hgal mod
etails see pos
9 by J. Nowa wak.
d by two stopped d muon decay el electrons – 47,000 events 87% % purity, 12% % ef effic icienc ncy
Martin Tzanov, PANIC 2008
µ
h µ and nd π
go nuclea ear inter eractions resul ultin ing in in kinked tracks.
ew fit itter er look
ht (muon
nd one ne kinked (pion)
ely it’s a three e ring fitter.
irst delt lta peak from neu eutrino experiment in more than 20 yea ears. PRELIMINARY
Martin Tzanov, PANIC 2008
νµCC CCπ0 differ eren ential al cross section
ed by one stopped ed muon decay el electron.
nly resonant compone nent.
ew three ring ng fit itter er – muon
2 ga gamma a tracks
event reconstruction
π µ ν µ + + → +
−
νµNC elas astic different ntial l cros
liminary result using g prompt ligh ght for pr proton n PID.
ew proton track fit itter will provide proton n PID D and d better recon
Martin Tzanov, PANIC 2008
MiniBooNE NE cross section and d other relev evant nt papers:
PRL 100 00, 032 3231 310 0 (2008)
eus Interactions with En<2 GeV, Phys Lett B.664, 41 (2008)
diction at MiniBooNE, Submitted to PRD [arXiv:0806:1449]
Papers in in the he immedia iate e future:
CCp+/νµCCQE(En) ratio io measurement nt (S. Linde den, J. Nowak)
nt fraction for anti- i-ne neutrin ino (V. Nguyen n ) Papers to follow w - Dif iffer erentia ial cross section
CCQE, (T. Katori), an anti- νµCCQE (T. Laird, d, J. Grange ge)
CC π+ (M. Wilk lking)
NC π0 (C. Ande derson)
astic (D. Perevalov)
CC π0 (R. Nelson)
Martin Tzanov, PANIC 2008
Martin Tzanov, PANIC 2008
University of Alabama Los Alamos National Laborator
Bucknell University Louisiana State University University of Cincinnati University of Michigan University of Color
ado Princeton University Columbia University Saint Mary’s University of
Embry Riddle University Virginia Polytechnic Institute Fermi National Accelerator Laboratory Wester ern n Illinois University Ind ndiana Univer ersity Yale University
Martin Tzanov, PANIC 2008
Subev event nt: Multiple e hits within a ~100 ns win indow form “subev even ents” Most events are from νµ CC inter eractions (ν+n n → µ+p) wit ith cha harac acteristic ic two “subevent nt” structure e from
stop
A 19. 9.2 ms be beam trigger window w
ncompas asses es the e 1.6 ms spill ll
arts 4 ms before e the he beam am
Martin Tzanov, PANIC 2008
Muon event
ng track, small l scatter erin ing Electron
ing
ack, large scat atter ering
and looks like e elec ectron
π0 event – two fuzzy rings