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The European Physical Journal A

, Volume 34, Issue 2, pp 161–183 | Cite as

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

  • B. Borasoy
  • P. C. BrunsEmail author
  • U. -G. Meißner
  • R. Nißler
Regular Article - Theoretical Physics

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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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2007

Authors and Affiliations

  • B. Borasoy
    • 1
  • P. C. Bruns
    • 1
    Email author
  • U. -G. Meißner
    • 1
    • 2
  • R. Nißler
    • 1
  1. 1.Helmholtz-Institut für Strahlen- und Kernphysik (Theorie)Universität BonnBonnGermany
  2. 2.Institut für Kernphysik (Theorie)Forschungszentrum JülichJülichGermany

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