Gauge-invariant approach to meson photoproduction including the final-state interaction

Details Gauge-invariant approach to meson photoproduction including the final-state interaction Gauge-invariant approach to meson photoproduction including the final-state interaction

2006-05-23

arxiv.org/abs/nucl-th/0605059v2

Phys.Rev. C74 (2006) 045202

Physics

Nuclear Physics

Nuclear Theory

14 pages, 8 figures, RevTeX4; revised version as scheduled to appear in Physical Review C

Scientific paper

10.1103/PhysRevC.74.045202

A fully gauge-invariant (pseudoscalar) meson photoproduction amplitude off a nucleon including the final-state interaction is derived. The approach based on a comprehensive field-theoretical formalism developed earlier by one of the authors replaces certain dynamical features of the full interaction current by phenomenological auxiliary contact currents. A procedure is outlined that allows for a systematic improvement of this approximation. The feasibility of the approach is illustrated by applying it to both the neutral and charged pion photoproductions.

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