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

Abstract

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.

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

References in corpus (1)

• Spin structure of spin-1/2 baryon and spinless meson production amplitudes in photo and hadronic reactions

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• On the sign of the pi-rho-omega coupling constant