Abstract
The proton Compton scattering cross section resulting from a numerical evaluation of nucleon Compton scattering dispersion relations is compared with experimental data at 90° center of mass and 135° center of mass from 0–300 Mev incident photon energy. Below 240 Mev the cross section at 90° is best approximated by the dispersion-theoretic amplitude which omits the contribution from the 2 — π intermediate state in Channel III, while the cross section at 135° is best approximated by the amplitude which includes this contribution. Above 240 Mev the approximations made in the absorptive part in Channel I result in a rapid deterioration of the predictions. The effect of the contribution from the heretofore neglected 2 — π intermediate state in Channel III is considered and is used to dispute the validity of previous predictions of the neutral pion lifetime based upon proton Compton scattering dispersion relations.
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