# 6th International Workshop on Neutrino-Nucleus Interactions in the Few-GeV Region (NUINT 09)

May 18 – 22, 2009
Sitges (Barcelona) Spain

## Neutrino induced pion production at MiniBooNE and K2K within the GiBUU model

May 22, 2009, 9:00 AM
25m
Sitges (Barcelona) Spain

#### Sitges (Barcelona) Spain

Palau Maricel Sitges (Barcelona) Spain
Talk Single pion production

### Speaker

Tina Leitner (Universitaet Giessen)

### Description

A precise determination of neutrino oscillation parameters demands for an equally precise knowledge of the neutrino nucleus interaction process. Neutrino induced pion production is strongly influenced by nuclear effects. Their understanding is crucial since neutral current $\pi0$ production is a major background in $\nu_e$ appearance experiments, while charged current $\pi^+$ production introduces a background to $\nu_\mu$ disappearance searches. We have investigated both, charged and neutral current neutrino induced pion production off nuclei, at MiniBooNE and K2K energies within the GiBUU transport model. Assuming impulse approximation, we treat the nucleus as a local Fermi gas of nucleons bound in a density and momentum potential. The outcome of the initial neutrino nucleon reaction undergoes complex hadronic final state interactions where in-medium spectral functions of the particles are taken into account. We present results for neutral current $\pi0$ and charged current $\pi^+$ production and compare to first MiniBooNE and K2K data. A correct understanding of neutrino induced pion production is also important for the reconstruction of the neutrino energy out of quasi-elastic scattering---events where the pion is absorbed in the nucleus might be misidentified as quasi-elastic and thus, modify the reconstructed energy leading to errors in the oscillation measurements.

### Primary author

Tina Leitner (Universitaet Giessen)

### Co-authors

Luis Alvarez-Ruso (Universidad de Murcia) Oliver Buss (Universitaet Giessen) Ulrich Mosel (Universitaet Giessen)