Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

HK: Fachverband Hadronen und Kerne

HK 47: Hadron Structure and Spectroscopy II

HK 47.2: Vortrag

Mittwoch, 18. März 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. Bruns^1,2, Ulf-G. Meissner^1,2,3, 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.