Gauge invariance in two-particle scattering

B. Borasoy; P.C. Bruns; R. Ni{\ss}ler; U.-G. Mei{\ss}ner

Gauge invariance in two-particle scattering

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arxiv hep-ph/0508307 v2 pith:HB4XBX4O submitted 2005-08-30 hep-ph nucl-th

B. Borasoy , P.C. Bruns , U.-G. Mei{ss}ner , R. Ni{ss}ler This is my paper · ORCID

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keywords gaugeinvariancebethe-salpeterchiralcomplexcouplingderiveddescribed

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It is shown how gauge invariance is obtained for the coupling of a photon to a two-body state described by the solution of the Bethe-Salpeter equation. This is illustrated both for a complex scalar field theory and for interaction kernels derived from chiral effective Lagrangians.

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