Nuclear shadowing and ρ photoproduction

Abstract

\ensuremath{\rho} photoproduction on complex nuclei is reexamined using a generalized vector dominance model which succesfully predicts the oberved nuclear shadowing in real photoabsorption and deep inelastic scattering. This model is shown to give a good fit to \ensuremath{\rho} photoproduction data on both nucleons and complex nuclei, in which the disagreement between the measured \ensuremath{\gamma}-\ensuremath{\rho} coupling and the \ensuremath{\gamma}-\ensuremath{\rho} coupling required by the simple vector dominance model is eliminated. The $\ensuremath{\rho}N$ total cross sections required are similar to those predicted by the additive quark model, and the magnitude of the correction to simple vector dominance is consistent with that inferred from the analysis of real photoabsorption and deep inelastic scattering.