Abstract
We investigate the pion photoproduction reaction γN→γNπ as a probe of pion electromagnetic polarizability. This reaction had been proposed as having the potential to resolve the long standing discrepancy between measurements of pion polarizabilities and the predictions of Chiral Perturbation Theory. We have carried out a series of calculations of ratios of substructure — related to background contributions for energies below the Δ resonance — but have to report that the largest values are found in the high-energy tail of the photon spectrum and that these are of the order of 0.1% for charged pions and 1% for neutral pions. We conclude that these sensitivities are not yet accessible experimentally, and that this regime of energy should be excluded from current consideration.
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