Pion re-scattering in pi0 production near threshold

Abstract

We compare the most used approximations to calculate the contribution from pion re-scattering mechanisms to pion production from proton-proton scattering, near threshold. Our calculation employs a pseudo-vector coupling for the pi NN vertex and realistic amplitudes for the pi N re-scattering and the NN transitions.

3 pages, 1 figure. To be published in the proceedings of the 17th International IUPAP Conference on Few-body Problems in Physics, June 5-10, 2003, Durham, North Carolina, USA