Abstract
The amplitude for pion photo- and electroproduction from finite nuclei is constructed in a model that ignores rescattering of the pion. A consistent expansion in inverse powers of the nucleon mass is performed, which generates effective one-body and two-body nuclear operators. The former agree with the Blomqvist-Laget effective operators, while the latter are new and arise from binding-induced and binding-modified emission. Current conservation is applied to this set of operators and they are cast separately into manifestly gaugeinvariant forms. A simple approximation to the complicated two-body terms is constructed, which shares many of the features of the latter.
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