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HK: Fachverband Hadronen und Kerne
HK 47: Hadron Structure and Spectroscopy II
HK 47.2: Talk
Wednesday, March 18, 2009, 14:15–14:30, H-ZO 30
A gauge-invariant chiral unitary framework for kaon photo-and electroproduction on the proton — Bugra Borasoy1, •Peter C. Bruns1,2, Ulf-G. Meissner1,2,3, and Robin Nissler1 — 1Helmholtz-Institut für Strahlen-und Kernphysik (Theorie), Universität Bonn, Nußallee 14-16, 53115 Bonn, Germany — 2Bethe Center for Theoretical Physics, Universität Bonn, 53115 Bonn, Germany — 3Institut für Kernphysik (Theorie) and Jülich Center for Hadron Physics, Forschungszentrum Jülich, 52425 Jülich, Germany
We present a gauge-invariant approach to meson photoproduction on nucleons within a chiral unitary framework. The interaction kernel for meson-baryon scattering is derived from the chiral effective Lagrangian and iterated in a Bethe-Salpeter equation. Data on kaon photoproduction from SAPHIR, CLAS and CBELSA/TAPS are analyzed in the threshold region. The importance of gauge invariance and the precision of various approximations utilized in earlier works are discussed.