Abstract

The off-shell gauge violation in the photoproduction of a soft pion or axial spurion is shown to be completely contained in the nucleon pole terms of the amplitude. Using this one can show that the partially conserved axial vector current hypothesis, so modified as to take first-order electromagnetic interactions into account, is sufficient to determine sum rules between the anomalous isoscalar and isovector nucleon magnetic moments and the soft-pion forward photoproduction amplitude. Such sum rules have been previously obtained using the techniques of current algebra.

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