Dispersion analysis for generalized spin polarizabilities

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.

Comments: 5pages, 2 figures, to appear in the Proceedings of the Symposium on the Gerasimov-Drell-Hearn Sum Rule and the Spin Structure in the Nucleon Resonance Region (GDH2000), June 14-17 2000, Mainz, Germany