WG2 Summary: Part II

1
WG2 Summary Part II

• Conveners
• S. Boyd, M. Sakuda, S. Zeller
• NuFact06 Workshop
• August 30, 2006

• flux ? uncertainties (Boyd)
• 2. ? scattering exps predictions (Zeller)
• - past, present, and future as presented in
  WG2

2
Neutrino Scattering Results

• started WG sessions with survey of recent new
  results
• - low energy K2K, MiniBooNE
• - medium/high energy lAr, MINOS, NuTeV
• these experiments have a lot to teach us for
  future
• ? factories and ? beams
• want to leave you with some take-aways from
• WG2 presentations discussions

3
Summary of Results from K2K

• measurement of MA
• from QE sample
• - SciFi detector (H2O)

3 measurements utilizing all 3 near detectors
4
Summary of Results from K2K

• (1) measurement of MA
• from QE sample
• - SciFi detector (H2O)
• - shape fit to dN/dQ2

• MA 1.20 ? 0.12 GeV
• - interesting as K2K MA
• larger than previous
• measurements (D2)
• important because effects
• both shape and rate of QE
• signal yields

(Y. Hayato)
5
Summary of Results from K2K

• (2) search for CC coherent ?
• production
• - 12C-based SciBar detector

• surprising results
• see no evidence for
• coherent ? prod at LE
• filling in a gap where
• previously no data

(Y. Hayato)
6
Summary of Results from K2K

• (3) measurement of NC ?0
• - water Cerenkov detector
• - background for ?? ? ?e
• - ?0 ? ??

• important addition as there are
• very few existing measurements
• (previously only handful of events)
• confirmation K2K ?0/? ratio
• consistent w/ MC expectation

(Y. Hayato)
7
Updated ?0 Results from MiniBooNE

• NC ?0 rate measurement in CH2 for direct use in
• MiniBooNE ?e appearance analysis
• - debut of these results _at_ NuFact

• highest statistics sample of
• NC ?0 events ever collected!
• 30,000 ?0 events
• described ?0 rate analysis
• and mis-ID constraint in detail
• example proof of principle
• for future experiments

(J. Link)
8
Updated ?0 Results from MiniBooNE

• from this data, can also extract coherent ?0
  fraction
• - from fit to E-weighted ?0 angular
  distribution
• - in context of Rein-Sehgal model

• MiniBooNE data favors non-zero
• NC coherent ?0 contribution
• - COH ?0/(RES ?0 COH ?0) 18
• interesting with respect to what
• is currently being seen in CC case
• (K2K)

COH ?0 prod more forward
(J. Link)
9
Results from MINOS Near Detector

• nice complement to existing K2K and MiniBooNE
• ????analyses (hope to measure MA, coherent ?
  prod)
• ?? measurements on Fe
• very close to having a total
• ???? CC ? measurement

(M. Kordosky)
mock data

• will also have sizable dimuon sample
• in interesting LE region (20-30 GeV) -
• charm production near threshold

10
Charm Production

• important background for ?e? ?? and ??? ??
  searches
• review of status of existing charm prod
  measurements
• on both sides of the Atlantic

• NuTeV both ? and ???on Fe
• - published forward dimuon ?
• - 5163 neutrino, 1380 antineutrino
• - also CC ? and SFs (M. Tzanov)
• NOMAD results expected soon
• - 14,000 dimuon events ? high stats!
• CHORUS emulsion
• - published D0 prod ?
• - associated charm, diffractive DS

(D. Mason)
11
Neutrino Results in Liquid Argon

• exposure of 50L lAr prototype in CERN WANF ? beam

• 1st observation of
• ? interactions in lAr!
• 10,000 ?? CC events

(E. Rondio)

• selection of 86 golden QE evts
• clear evidence for sizable nuclear
• effects even at these higher Es
• much interest request to
• expand analyses (get most out of data)
• - neutron ID, ? ?0 reconstruction

12
Electron Scattering Data

• wealth of high statistics electron data
  available that
• is of direct relevance for ? experiments
• - important constraint on vector component
• of our ???? predictions nuclear effects

• inclusive measurements (Hall-C)
• - low Q2 cross sections
• - variety of targets
• - offering new kinematic coverage
• exclusive data (Hall-B, CLAS)
• - mom dists for p,?? in 1?, 2? events
• - how often see p in QE interactions?
• - ?/?0 ratio as function of W, Q2
• - targeted studies

(S. Manly)
13
Look Towards the Future

• program of dedicated ? scattering experiments to
  
• more precisely measure ???'s
• - SciBooNE (Booster ? beamline)
• - MINER?A (NuMI beamline)
• couple existing high intensity ? beamlines with
  new
• fine-grained, highly segmented detectors
• to help advance us to the next level of precision

14
SciBooNE Experiment
(H. Tanaka)

• precise low energy ? ? measurements
• - for T2K
• - improve on MiniBooNE ??analyses
• using fine grained SciBar detector
• (operated successfully in K2K)
• SciBar detector just arrived at FNAL
• start data taking in March 2007

p
?
15
MINER?A Experiment

• precision neutrino scattering meas
• - impressive list of physics capabilities
• wide range of neutrino energies
• - QE ? transition region ? DIS
• variety of nuclear targets
• - 1st time can study nuclear effects
• in neutrino interactions in detail
• construction begins 2008
• data taking in 2009

p
(S. Manly)
?
16
Also

• prospects for measuring ?s
• using JPARC off-axis ? beam
• (Miyachi)
• - dual target liquid
• scintillator detector
• - 30x statistics of E734

• search for charmed pentaquarks
• at a ? factory (G. DeLellis)
• - using existing emulsion detector
• technology
• - experimental proofs of
• measurement feasibility

17
Theoretical Calculations

• improvements in ? scattering measurements
  ideas
• matched by ongoing improvements in theoretical
  calcs
• looking beyond tools predictions that have
  been in
• common use for decades (e.g. Fermi Gas model,
  etc.)
• heard 3 examples in last session of WG2

18
Theory QERES
FG

• (1) H. Nakamura spectral functions
• - improved agreement w/ e- data
• over what was shown at NuFact05
• (2) O. Lalakulich single ? production
• - updated fits to JLAB data to better
• determine vector FFs Q2 dep
• (3) D. Meloni IA spectral function
• - for specific use in predicting ??

SF
19
Conclusions

• exciting advancements in low energy ? scattering
  physics
• - new experimental measurements
• - even some surprises!
• - new theoretical calculations
• eagerly await new experiments which
• will be coming online in next few years
• provide even more precise ??

20
Conclusions

• exciting advancements in low energy ? scattering
  physics
• - new experimental measurements
• - even some surprises!
• - new theoretical calculations
• eagerly await new experiments which
• will be coming online in next few years
• provide even more precise ??
• thanks to all of our WG2
• speakers and participants
• sincere thank you to D. Casper
• truly an exceptional workshop!