Abstract
The pion photoproduction amplitude is calculated within an isobar model already used to determine the Δ + + ( 1232 MeV ) parameters in pion-nucleon scattering. This amplitude is expressed in terms of physical on-shell quantities, and the contribution involving the off-shell behavior of the final state interaction is isolated as principal value integrals on the nonpolar pion-nucleon K-matrix. Different form factors to regularize these integrals are proved, we getting a model independent determination of the couplings G M and G E , which is consistent with the modern quark models for the resonance.
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