A gauge-invariant chiral unitary framework for kaon photo- and electroproduction on the proton

B. Borasoy; P. C. Bruns; U. -G. Meißner; R. Nißler

doi:10.1140/epja/i2007-10492-4

EPJ

A gauge-invariant chiral unitary framework for kaon photo- and electroproduction on the proton

B. Borasoy¹, P. C. Bruns¹^*, U. -G. Meißner¹^,2 and R. Nißler¹

¹ Helmholtz-Institut für Strahlen- und Kernphysik (Theorie), Universität Bonn, Nußallee 14-16, D-53115, Bonn, Germany
² Institut für Kernphysik (Theorie), Forschungszentrum Jülich, D-52425, Jülich, Germany

Received: 21 September 2007
Accepted: 12 October 2007
Published online: 12 November 2007

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.

PACS: 13.60.Le Meson production – / 25.20.Lj Photoproduction reactions – / 12.39.Fe Chiral Lagrangians –

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EPJ

A gauge-invariant chiral unitary framework for kaon photo- and electroproduction on the proton

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