A nonrelativistic operator for pion electroproduction

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Abstract
In this paper, a nonrelativistic operator for pion electroproduction from nuclei is presented. It approximates a combination of pseudovector Born plus Δ-resonance diagrams using a method that does not break up the nucleon propagators into their positive and negative energy parts as was done in previous efforts. This result gives an operator that maintains its gauge-invariance cancellations exactly. Comparisons are made with a sample of photoproduction and electroproduction data.

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