Abstract
It is shown that the simple expression for the forward virtual Compton scattering on a soft pion for the π + - π 0 electromagnetic mass difference calculation usually obtained from Current Algebra and Weinberg sum rules can be derived in a simple manner from a chiral Lagrangian with vector and axial vector mesons. We also discuss the relation between the chiral Lagrangian approach and the dispersion relation for the Compton amplitude.
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