Dynamical model for pion-nucleon bremsstrahlung - art. no. 014604

A dynamical model based on effective Lagrangians is proposed to describe th e bremsstrahlung reaction pi N-->pi N gamma at low energies. The Delta(1232 ) degrees of freedom are incorporated in a way consistent with both electro magnetic gauge invariance and invariance under contact transformations. The model also includes the initial- and final-state rescattering of hadrons v ia a T matrix with off-shell effects. The pi N gamma differential cross sec tions are calculated using three different T-matrix models and the results are compared with the soft photon approximation, and with experimental data . The aim of this analysis is to test the off-shell behavior of the differe nt T matrices under consideration.