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Gauge-invariant tree-level photoproduction amplitudes with form factors
Physical Review C
We show how the gauge-invariance formulation given by Haberzettl is implemented in practice for photoproduction amplitudes at the tree level with form factors describing composite nucleons. We demonstrate that, in contrast to Ohta's gauge-invariance prescription, this formalism allows electric current contributions to be multiplied by a form factor, i.e., it does not require that they be treated like bare currents. While different in detail, this nevertheless lends support to previous ad hocdoi:10.1103/physrevc.58.r40 fatcat:mlpuvrf54bgfvbvvy6d4vtdla4