Regge Pole Model for Vector Meson Photoproduction at HERA

Abstract

Recent $HERA$ data on the photoproduction of vector mesons are analysed within a "soft", dipole pomeron model. We argued that the data on ${\sigma }_{el}^{\gamma \to J/\psi }$ is consistent with a soft pomeron, the apparent rapid increase resulting from the non-asymptotic effects due to the delayed asymptotics of ${\sigma }_{el}$ with respect to ${\sigma }_{tot}$.

Comments: Talk given at the XII-th workshop on "soft" physics "HADRONS-96: CONFINENENT" Novy Svet, Crimea, Ukraine, June 9-16, 7 pages, 4 eps figures included