Meson Production on the Nucleon in the Giessen K-Matrix Approach
  Meson production on the proton is described in a coupled channels K-matrix approach. Both hadronic and photonic scenarios are taken into account on the same theoretical footing. At tree-level the Born amplitudes are obtained from an effective Lagrangian with phenomenologically adjustable coupling constants. The spectral distributions, resonances and their width and the background contributions are obtained within the same approach, thus accounting properly for interference effects. Applications to omega- and associated strangeness production on the proton are discussed. 
H. Lenske, V. Shklyar, U. Mosel