Diffractive Vector Meson Production at HERA

Abstract

The H1 and ZEUS collaborations at HERA report new data on the diffractive production of vector mesons with a many-fold increase of luminosity compared to previous measurements. The new data include photoproduction and electroproduction of ${\rho }^0,\varphi ,J/\psi$. The available data on elastic VM production indicate that the interaction scales as $Q^2+M_V^2$.

4 pages, 3 Figures, Latex