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Compton scattering and polarizabilities of the nucleon

M. Gorchtein, D. Drechsel, B. Pasquini, M. Vanderhaeghen

hep-pharXiv:hep-ph/9911412

Abstract

Fixed-t subtracted dispersion relations are presented for Compton scattering off the nucleon at energies Eγ≤ 500 MeV, as a formalism to extract the nucleon polarizabilities from the data with a minimum of model dependence. The scalar polarizabilities difference α- β and the backward spin polarizability γπ enter directly as fit parameters in this formalism.

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