Pion-nucleon scattering in the K-matrix approach
A.B. Gridnev - N.G. Kozlenko
Petersburg Nuclear Physics Institute, Gatchina, Leningrad district, 188350, Russia (e-mail: email@example.com)
Received: 9 July 1998 Communicated by V.V. Anisovich
The K-matrix approach with effective Lagrangians is used to describe the S and P pion-nucleon partial-wave amplitudes in the energy range GeV. It is demonstrated, that treating the resonance as K-matrix a pole gives the natural way to separate the resonance and non-resonance parts of the amplitude. The model includes all the four-star resonances, the non-resonance contributions are calculated from relevant Feynman graphs without any phenomenological form factors. Different contributions to the inelastic amplitude are estimated.
14.20.Gk Baryon resonances - 13.75.Eg Partial wave analysis