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Simple dynamical model for. gamma. N. -->. pi. /sup + -/. delta

Journal Article · · Phys. Rev., D; (United States)
An elementary phenomenological extension of the gauge-invariance- constrained dynamical amplitudes for ..gamma..N ..-->.. ..pi../sup + -/..delta.. is considered. The extended amplitudes are parameterized with a real (minimal gauge-invariant extension of one-pion-exchange) background term and simple Regge-pole forms. The two free parameters which both appear in the unnatural-parity-exchange component are determined by comparison with dsigma''/dt data for ..gamma..p ..-->.. ..pi../sup -/..delta../sup + +/. The remainder of the natural-parity exchange is represented by rho and A/sub 2/ exchange. Predictions are made for dsigma/dt and ..xi.., for the various charge states and the unnatural-parity-exchange components are well described in each case.
Research Organization:
Department of Physics, Texas A M University, College Station, Texas 77840
OSTI ID:
6692612
Journal Information:
Phys. Rev., D; (United States), Journal Name: Phys. Rev., D; (United States) Vol. 18:5; ISSN PRVDA
Country of Publication:
United States
Language:
English