Gauge invariant unitary theory for pion photoproduction
- 1 August 1995
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review C
- Vol. 52 (2) , 554-567
- https://doi.org/10.1103/physrevc.52.554
Abstract
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 πN and γπN 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 πN→πN and γN→πN.Keywords
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