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Dispersion analysis for generalized spin polarizabilities

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

hep-pharXiv:hep-ph/0009239

Abstract

We report on a dispersion relation formalism for the virtual Compton scattering (VCS) reaction on the proton, which for the first time allows a dispersive evaluation of 4 generalized polarizabilities. The dispersion formalism provides a new tool to analyze VCS experiments above pion threshold, thus increasing the sensitivity to the generalized polarizabilities of the nucleon.

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