A gauge-invariant chiral unitary framework for kaon photo- and electroproduction on the proton |
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| Authors: | B Borasoy P C Bruns U -G Meißner R Nißler |
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| Institution: | 1.Helmholtz-Institut für Strahlen- und Kernphysik (Theorie),Universit?t Bonn,Bonn,Germany;2.Institut für Kernphysik (Theorie),Forschungszentrum Jülich,Jülich,Germany |
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| Abstract: | We present a gauge-invariant approach to photoproduction of mesons 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.
Within the leading-order approximation to the interaction kernel, 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 in the
interaction kernel utilized in earlier works are discussed. |
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| Keywords: | 13 60 Le Meson production 25 20 Lj Photoproduction reactions 12 39 Fe Chiral Lagrangians |
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