Preserving the gauge invariance of meson production currents in the presence of explicit final-state interactions

Abstract

A comprehensive formalism is developed to preserve the gauge invariance of currents describing the photo- or electroproduction of mesons off the nucleon when the final-state interactions of mesons and nucleons is taken into account explicitly. Replacing exchange currents by auxiliary currents, it is found that all contributions due to explicit final-state interactions are purely transverse and do not contain a Kroll-Ruderman-type contact current. The relation of the present formulation to tree-level-type prescriptions is shown.

6 pages, 2 figures; published version

References in corpus (3)

• Photon- and meson-induced reactions on the nucleon
• Gauge-invariant tree-level photoproduction amplitudes with form factors
• Gauge-invariant theory of pion photoproduction with dressed hadrons

Cited by in corpus (5)

• Gauge-invariant approach to meson photoproduction including the final-state interaction
• Investigating the parity of the exotic Theta^+ baryon from the kaon photoproduction
• Pion photo- and electroproduction and the partially-conserved axial current
• On the pion electroproduction amplitude
• Electromagnetic currents for dressed hadrons