Gauge invariance in two-particle scattering
B. Borasoy, P. C. Bruns, U. -G. Meißner, R. Nißler
Abstract
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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