28 research outputs found
Can One Distinguish Tau Neutrinos from Antineutrinos in Neutral-Current Pion Production Processes?
A potential way to distinguish tau-neutrinos from antineutrinos, below the
tau-production threshold, but above the pion production one, is presented. It
is based on the different behavior of the neutral current pion production off
the nucleon, depending on whether it is induced by neutrinos or antineutrinos.
This procedure for distinguishing tau-neutrinos from antineutrinos neither
relies on any nuclear model, nor it is affected by any nuclear effect
(distortion of the outgoing nucleon waves, etc...). We show that
neutrino-antineutrino asymmetries occur both in the totally integrated cross
sections and in the pion azimuthal differential distributions. To define the
asymmetries for the latter distributions we just rely on Lorentz-invariance.
All these asymmetries are independent of the lepton family and can be
experimentally measured by using electron or muon neutrinos, due to the lepton
family universality of the neutral current neutrino interaction. Nevertheless
and to estimate their size, we have also used the chiral model of
hep-ph/0701149 at intermediate energies. Results are really significant since
the differences between neutrino and antineutrino induced reactions are always
large in all physical channels.Comment: Revised version. 8 pages, 3 figures. The abstract has been changed
and discussion extende
WroNG -- Wroclaw Neutrino Generator of events for single pion production
We constructed a new Monte Carlo generator of events for neutrino CC single
pion production on free nucleon targets. The code uses dynamical models of the
DIS with the PDFs modified according to the recent JLab data and of the Delta
excitation. A comparison with experimental data was done in three channels for
the total cross sections and for the distributions of events in invariant
hadronic mass.Comment: 6 pages, 13 figures, Presented by J.T. Sobczyk at the 3rd
International Workshop on Neutrino-Nucleus Interactions in the Few-GeV
Region, 17-21 March, Gran Sasso(Italy),to appear in the Proceeding
Simulations from a new neutrino event generator
We construct a new Monte Carlo generator of events for neutrino interactions.
The dynamical models for quasi-elastic reactions, excitation and more
inelastic events described by the DIS formalism with the PDFs modified
according to recent JLab data are used. We describe in detail single pion
production channels, which combine the excitation and DIS
contribution. Many comparisons of the outcome of simulations with experimental
data are presented.Comment: To appear in the proceedings of 4th International Workshop on
Neutrino Nucleus Interactions in the Few GeV Region (NuInt05), Okayama,
Japan, 26-29 September, 200
Comparison of predictions for nuclear effects in the Marteau model with the NUX+FLUKA scheme
Nuclear effects in neutrino-nucleus reactions simulated by means of the
NUX+FLUKA Monte Carlo generator are compared with the theoretical predictions
of the Marteau model. Pion absorption in NUX+FLUKA and non-pionic Delta decays
in the Marteau model differ by about 30%. The fraction of pions produced due to
the re-interactions after primary quasi-elastic vertex is in the NUX+FLUKA
scheme much higher then provided by the Marteau model.Comment: 6 pages, 8 figures, Presented by J.A. Nowak at the 3rd International
Workshop on Neutrino-Nucleus Interactions in the Few-GeV Region, 17-21 March,
Gran Sasso(Italy),to appear in the Proceeding
Charged Current Single Pion Cross Section Measurement at MiniBooNE
We present MiniBooNE's preliminary numu charged-current single pion (CC1pi)
cross section measurement, calculated using the ratio to charge current
quasi-elastic (CCQE) events. We find the inclusive CC1pi cross section to be
below the predcition of the NUANCE and NEUGEN Monte Carlos.Comment: 6 pages, 6 figures, proceedings from NuInt0
Charged current weak production of the Delta resonance
The charge changing weak production of Delta in nucleons and nuclei is
studied. The reactions e^{-} p -> Delta^{0} \nu_{e} and e^{+} p -> Delta^{++}
\bar{\nu}_{e} are considered as a possible source of information about the weak
N-Delta transition form factors. The low q^2 BNL data on neutrino production of
Delta are used to extract the axial vector N-Delta coupling, taking into
account the deuteron structure and the Delta width. Finally, pion production
induced by neutrinos in ^{16}O in the Delta region, relevant to atmospheric
neutrino experiments, is investigated.Comment: 4 pages, 2 figures. To appear in Proceedings of PANIC9
A New Neutrino Cross Section Database
We describe a new web based data resource being developed to provide access
to accurate and validated cross sections of low energy neutrino and
antineutrino interactions. The proposed content of this database are outlined
which cover total and differential cross from inclusive, quasi-elastic and
exclusive pion production processes from charged and neutral current
interactions. Efforts to obtain these data, which come mainly from old bubble
chamber experiments, are described as well as the implementation of an
embryonic web site to make the resource generally accessible.Comment: 6 pages, 3 figures, To appear in the proceedings of the 3rd
International Workshop on Neutrino Nucleus Interactions in the few GeV region
(NuInt04), Gran Sasso, Assergi, Italy, 17-21 Mar 200
Single Pion Production in Neutrino Reactions and Estimates for Charge-Exchange Effects
We calculate single pion production by neutrinos in the resonance region. We
consider both charged and neutral current reactions on free protons and
neutrons. We present differential and total cross sections which can be
compared with experiments. Then we use these results to calculate the spectra
of the emerging pions including the Pauli suppression factor and rescattering
corrections for reactions in heavy nuclei. Our results will be useful for
studying single pion production and for investigating neutrino oscillations in
future experiments.Comment: 20 pages, 16 figure
Transport study of charged current interactions in neutrino-nucleus reactions
Within a dynamical transport approach we investigate charged current
interactions in neutrino-nucleus reactions for neutrino energies of 0.3 - 1.5
GeV with particular emphasis on resonant pion production channels via the
resonance. The final-state-interactions of the resonance as
well as of the emitted pions are calculated explicitly for and
nuclei and show a dominance of pion suppression at moderate momenta
0.2 GeV/c. A comparison to integrated spectra for reactions with the available (preliminary) data demonstrates a
reasonable agreement.Comment: 13 pages incl. 6 eps-figures; computational error in final state
interactions corrected; to be published in Phys. Lett.
On two weak CC Delta production models
We perform a detail analysis of two models of neutrino CC Delta production on
free nucleons. First model is a standard one based on nucleon-Delta transition
current with several form-factors. Second model is a starting point for a
construction of Marteau model with sophisticated analytical computations of
nuclear effects. We conclude that both models lead to similar results.Comment: 9 pages, includes 9 figures, accepted for publication in J. Phys.