May 18 – 22, 2009
Sitges (Barcelona) Spain
Europe/Madrid timezone

Dynamical Model Approach to Coherent Pion Production

May 22, 2009, 10:15 AM
15m
Sitges (Barcelona) Spain

Sitges (Barcelona) Spain

Palau Maricel Sitges (Barcelona) Spain
Talk Single pion production Single pion production II

Speaker

Dr Satoshi Nakamura (Universidade de Sao Paulo)

Description

We report our recent study on the coherent pion production in the neutrino-nucleus scattering in the sub- and few-GeV region. In our approach, the transition amplitude is calculated by summing elementary amplitudes of a weak pion production off a single nucleon embedded in a nuclear environment. Therefore, it is of primary importance to start with a model which reasonably describes electroweak pion productions off a free single nucleon. The Sato-Lee (SL) model is such a model, and we employ it in our calculation. The SL model contains both resonant and non-resonant mechanisms. For a reaction on a nuclear target, we need to consider medium effects such as the change of the delta-propagation (shifts of the mass and width) and the final-state interactions between the outgoing pion and nucleus. In the energy region of our interest, we may take care of these important medium effects using the delta-hole model. Thus our model is based on a combination of the SL model and the delta-hole model. Our model takes care of non-local effects of the delta propagation in nuclei. All free parameters in our model are optimally fitted to both elastic and total cross sections of the pion-nucleus scattering. First, we calculate the coherent pion photo-production off a nucleus, and then compare the result with data to test the reliability of our approach. We find a reasonable agreement with data, and have a good basis to proceed to the neutrino process. In our presentation, we explain our model and show new numerical results for the charged-current and neutral-current reactions, and the neutrino and antineutrino reactions. We also make a comparison of our result with recent data and other theoretical calculations.

Primary author

Dr Satoshi Nakamura (Universidade de Sao Paulo)

Co-authors

Dr Barbara Szczerbinska (Dakota State University) Prof. Harry Lee (Argonne National Laboratory) Prof. Kuniharu Kubodera (University of South Carolina) Prof. Toru Sato (Osaka University)

Presentation materials