135 research outputs found
Theoretical highlights of neutrino-nucleus interactions
The recent theoretical developments in the field of neutrino-nucleus
interactions in the few-GeV region are reviewed based on the presentations made
at the NuInt09 Workshop. The topics of electron scattering and its connections
with neutrino interactions, neutrino induced quasielastic scattering and pion
production (coherent and incoherent) are covered, with special emphasis on the
challenges that arise in the comparison with new experimental data.Comment: Plenary talk at NuFact09, Chicago, July 20-25, 200
Quasielastic Scattering at MiniBooNE Energies
We present our description of neutrino induced charged current quasielastic
scattering (CCQE) in nuclei at energies relevant for the MiniBooNE experiment.
In our framework, the nucleons, with initial momentum distributions according
to the Local Fermi Gas model, move in a density- and momentum-dependent mean
field potential. The broadening of the outgoing nucleons due to nucleon-nucleon
interactions is taken into account by spectral functions. Long range (RPA)
correlations renormalizing the electroweak strength in the medium are also
incorporated. The background from resonance excitation events that do not lead
to pions in the final state is also predicted by propagating the outgoing
hadrons with the Giessen semiclassical BUU model in coupled channels (GiBUU).
We achieve a good description of the shape of the CCQE Q2 distribution
extracted from data by MiniBooNE, thanks to the inclusion of RPA correlations,
but underestimate the integrated cross section when the standard value of MA =
1 GeV is used. Possible reasons for this mismatch are discussed.Comment: 6 pages, 4 figures, Proceedings of the Sixth International Workshop
on Neutrino-Nucleus Interactions in the Few-GeV Region (NuInt09), May 18-22,
Sitges, Barcelona, Spai
PCAC and coherent pion production by neutrinos
Coherent pion production in low energy neutrino reactions is discussed in the
framework of the partially conserved axial vector current theory (PCAC). The
role of lepton mass effects in suppressing production of positively charged
pions is discussed. Instead of using models of pion nucleus scattering, the
available data on pion carbon scattering are implemented for an analysis of the
PCAC prediction. Our results agree well with the published upper limits for
positively charged production but are much below the recent MiniBooNE result
for neutral pion production.Comment: 6 pages, 7 figures, writeup of talk presented at NUINT 200
MicroBooNE: A New Liquid Argon Time Projection Chamber Experiment
Liquid Argon Time Projection Chamber detectors are well suited to study
neutrino interactions, and are an intriguing option for future massive
detectors capable of measuring the parameters that characterize neutrino
oscillations. These detectors combine fine-grained tracking with calorimetry,
allowing for excellent imaging and particle identification ability. In this
talk the details of the MicroBooNE experiment, a 175 ton LArTPC which will be
exposed to Fermilab's Booster Neutrino Beamline starting in 2011, will be
presented. The ability of MicroBooNE to differentiate electrons from photons
gives the experiment unique capabilities in low energy neutrino interaction
measurements.Comment: Proceedings of the 6th International Workshop on Neutrino-Nucleus
Interactions in the Few-GeV Region (NuInt09
First Measurement of Muon Neutrino Charged Current Quasielastic (CCQE) Double Differential Cross Section
Using a high statistics sample of muon neutrino charged current quasielastic
(CCQE) events, we report the first measurement of the double differential cross
section as a function of muon energy and angle for this process. The result
features reduced model dependence and supplies the most complete information on
neutrino CCQE scattering to date. Measurements of the absolute cross section as
a function of neutrino energy and the single differential cross section as a
function of 4-momentum transfer squared are also provided, largely to
facilitate comparison with prior measurements. This data is of particular use
for understanding the axial-vector form factor of the nucleon as well as
improving the simulation of low energy neutrino interactions on nuclear
targets, which is of particular relevance for experiments searching for
neutrino oscillations.Comment: 6 pages, 6 figures, Proceedings of the 6th International Workshop on
Neutrino-Nucleus Interactions in the Few-GeV Region (NuInt09
Challenges in Extracting Charged Current Quasi-Elastic Model Information in MiniBooNE's Anti-Neutrino Data
Using a high-statistics sample of anti-neutrino charged current quasi-elastic
(CCQE) events, MiniBooNE reports the challenges in measuring parameters within
the Relativistic Fermi Gas model. As the CCQE analysis has been completed in
MiniBooNE's neutrino data, particular attention is paid to the differences in
CCQE interactions between the two running modes.Comment: NuInt '09 conference proceedings. Four pages, five figure
Search for neutrino charged current coherent pion production at SciBooNE
SciBooNE is a neutrino experiment measuring the neutrino cross sections on
carbon in the one GeV region. We have performed a search for charged current
coherent pion production from muon neutrinos scattering on carbon, \nu_\mu 12^C
\to \mu 12^C \pi^+. No evidence for coherent pion production is observed. We
set 90% confidence level upper limits on the cross section ratio of charged
current coherent pion production to the total charged current cross section at
0.67\times 10^{-2} at mean neutrino energy 1.1 GeV and 1.36 \times 10^{-2} at
mean neutrino energy 2.2 GeV. The kinematic distributions of the final data
sample are also presented.Comment: 6 pages, 6 figures, Proceedings of the 6th International Workshop on
Neutrino-Nucleus Interactions in the Few-GeV Region (NuInt09
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