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

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

2000-03-27

arxiv.org/abs/nucl-th/0003058v2

Phys.Rev. C62 (2000) 034605

Physics

Nuclear Physics

Nuclear Theory

6 pages, 2 figures; published version

Scientific paper

10.1103/PhysRevC.62.034605

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.

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