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Resonance properties from a coupled channel meson exchange model |
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| Authors: | M.Dring C.Hanhart HUANG Fei S.Krewald U.-G.Meiner |
| Affiliation: | 1. Institut fur Kernphysik and Julich Center for Hadron Physics,Forschungszentrum Julich,D-52425 Jülich,Germany 2. Institut fur Kernphysik and Julich Center for Hadron Physics,Forschungszentrum Julich,D-52425 Julich,Germany;Institute for Advanced Simulation,Forschungszentrum Julich,D-52425 Jülich,Germany 3. Department of Physics and Astronomy,University of Georgia,Athens,Georgia 30602,USA 4. Institut fur Kernphysik and Julich Center for Hadron Physics,Forschungszentrum Julich,D-52425 Julich,Germany;Institute for Advanced Simulation,Forschungszentrum Julich,D-52425 Jülich,Germany;Helmholt |
| Abstract: | In this talk, I present the results on the pole structure of pion-nucleon scattering in an analytic model based on meson exchange. The analytic properties of scattering amplitudes provide important informa-tion. Besides the cuts, the poles and zeros on the different Riemann sheets determine the global behavior of the amplitude on the physical axis. Pole positions and residues allow for a parameterization of resonances in a well-defined way, free of assumptions for the background and energy dependence of the resonance part. This is a necessary condition to relate resonance contributions in different reactions. |
| Keywords: | pion-nucleon scattering meson exchange model analytic structure of the scattering amplitude |
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