Dispersion relations and the spin polarizabilities of the nucleon
D. Drechsel, G. Krein, O. Hanstein
Abstract
A forward dispersion calculation is implemented for the spin polarizabilities γ1, ... ,γ4 of the proton and the neutron. These polarizabilities are related to the spin structure of the nucleon at low energies and are structure-constants of the Compton scattering amplitude at O(ω3). In the absence of a direct experimental measurement of these quantities, a dispersion calculation serves the purpose of constraining the model building, and of comparing with recent calculations in heavy baryon chiral perturbation theory.
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