Photon- and meson-induced reactions on the nucleon

Abstract

In an unitary effective Lagrangian model we develop a unified description of both meson scattering and photon-induced reactions on the nucleon. Adding the photon to an already existing model for meson-nucleon scattering yields both Compton and meson photoproduction amplitudes. In a simultaneous fit to all available data involving the final states $γN$, $πN$, $ππN$, $ηN$ and $K Λ$ the parameters of the nucleon resonances are extracted.

57 pages, 14 figures, LaTex (uses Revtex and graphicx). Submitted to Phys. Rev. C. References updated, Fig. 14 changed