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HK: Fachverband Hadronen und Kerne
HK 80: Hadron Structure and Spectroscopy I
HK 80.5: Talk
Friday, March 20, 2009, 12:00–12:15, H-ZO 20
A Regge-plus-resonance approach to radiative kaon capture processes using crossing symmetry — •Tim Van Cauteren and Pieter Vancraeyveld — Ghent University, Dept. Subatomic and Radiation Physics, Proeftuinstraat 86, B-9000 Gent, Belgium
Over the last years, we have developed a Regge-plus-resonance (RPR) model for describing cross sections and polarization observables of kaon photo- and electroproduction from the proton. In our model, the background arises from the exchange of two kaon Regge-trajectories in the t-channel. A limited set of nucleon resonances is added to explain the broad structures seen in kaon production observables. Crossing symmetry can be used to relate the amplitude for γ(p,K)Y reactions to the amplitude for radiative kaon capture processes. This amounts to interchanging s- and u-channel, while the t-channel remains unaffected. Therefore, we can apply the background description from our RPR model for kaon production to the radiative kaon capture processes. Hyperon resonances can be added to explain possible structure. We present our results for K− p → γ Y (Y=Λ,Σ) cross sections for kaon momenta |pK→| between 514 and 750 MeV/c, which were measured by the Crystal Ball collaboration at BNL.