A comparison is made of the on-shell amplitudes F̄^(±)(0, t), obtained using interior dispersion relations, to their off-shell current-algebra predictions in order to test the pion PCAC (partial conservation of axial-vector current) limit in pion-nucleon scattering. It is concluded that, when ν and t are used as variables, the on-shell corrections to PCAC are on the order of 10% per pion.
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Hite et al. (1976) studied this question.
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