Dispersion analysis for generalized spin polarizabilities
  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. 
M. Vanderhaeghen, D. Drechsel, M. Gorchtein, A. Metz, and B. Pasquini