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HK: Physik der Hadronen und Kerne

HK 25: Theorie IV

HK 25.4: Talk

Tuesday, March 20, 2001, 17:30–17:45, F

Two pion production on the proton in hadronic processes — •Sonja Schneider, Siegfried Krewald, and Josef Speth — Institut für Kernphysik, Forschungszentrum Jülich GmbH, 52425 Jülich

We investigate the π N and ππ N decay of nuclear resonances in the framework of a meson exchange model. The Jülich model of the coupled reaction channels π N, η N, πΔ, σ N and ρ N can describe the π N phase shifts and inelasticities up to c.m. energies of 1.8 GeV [1]. We now extend this model to ππ N final states by considering the decay of the effective ππ N states πΔ, σ N and ρ N.

As a starting point we have taken into account tree level contributions for the reaction π N → ππ N. By including final state interaction in the dominantly contributing diagrams, a fair description of the data can be achieved.

[1] O.Krehl, C. Hanhart, S. Krewald and J. Speth, Phys.Rev. C 62 (2000) 025207