Abstract
Proton Compton scattering is analyzed with the chiral Lagrangian. Partial-wave amplitudes are obtained by an analytic extrapolation of subthreshold reaction amplitudes computed in chiral perturbation theory, where the constraints set by electromagnetic-gauge invariance, causality and unitarity are used to stabilize the extrapolation. We present and discuss predictions for various spin observables and polarizabilities of the proton. While for the transition polarizabilities γ E 1 M 2 , γ M 1 E 2 we recover the results of strict chiral perturbation theory, for the diagonal γ E 1 E 1 , γ M 1 M 1 elements we find significant effects from rescattering.
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