Abstract
We consider the process γπ→ρп for which three sum rules are derived from high-energy behaviour hypothesis. Combining these sum rules with the analogous ones for the process ρπ→ρπ we determine the electromagnetic widths of the ω, A1, A2 resonances, and theS-wave/D-wave ratio for the A1→ρπ decay. We discuss some features of gauge invariance and superconvergence requirements: in particular, we derive some already known low-energy theorem consequences,e.g. the sum rule obtained byHarari for Compton scattering. This last one and the Cabibbo and Radicati sum rule are used to select the best values of the ω, A1, A2 electromagnetic widths.
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