Gauge invariant unitary theory for pion photoproduction
- Department of Physics, The Flinders University of South Australia, Bedford Park, South Australia, 5042 (Australia)
The Ward-Takahashi identities are central to the gauge invariance of the photoproduction amplitude. Here we demonstrate that unitarity and in particular the inclusion of both the {pi}{ital N} and {gamma}{pi}{ital N} thresholds on equal footing yields a photoproduction amplitude that satisfies both two-body unitarity and the generalized Ward-Takahashi identities. The final amplitude is a solution of a set of coupled channel integral equations for the reactions {pi}{ital N}{r_arrow}{pi}{ital N} and {gamma}{ital N}{r_arrow}{pi}{ital N}.
- OSTI ID:
- 112985
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 2 Vol. 52; ISSN PRVCAN; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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