Virtual-Photon-Pion Scattering, Hard-Pion Current Algebra, and Dispersion Relations

Abstract

It is shown that the $\mathrm{SU}\left(2\right)\mathrm{}\times \mathrm{SU}\left(2\right)\mathrm{}$ current-algebra results for three- and four-point functions are broadly consistent with dispersion relations and the present saturation scheme, provided one writes once-subtracted dispersion relations for some of the form factors occurring in the virtual-photon-pion scattering amplitude.