Coupled-channel dynamics in pion- and photon-induced reaction
Deborah Roenchen (Forschungszentrum Jülich)

Elastic piN-scattering and pion-induced kaon and eta production are described simultaneously in a unitary coupled-channel meson exchange model that preserves analyticity and other general requirements of the S-matrix, and includes SU(3) symmetry and its breaking. In this Lagrangian-based, field theoretical approach strict two-body and requirements of three-body unitarity are guaranteed. Thus, a reliable extraction of resonance parameters in terms of poles and residues is possible.
The results of this analysis are combined with a gauge invariant approach to pion-, eta- and kaon-photoproduction.