Elastic Vector-Meson Production at HERA
Abstract
We show that the lowest-order QCD calculation in a simple model of elastic vector-meson production does reproduce correctly the ratios of cross sections for rho, phi and J/psi, both in photoproduction and in high-Q2 quasi-elastic scattering. The dependence of the slopes on the mass of the vector meson is reproduced as well. We examine the lower-energy data, and find that the energy dependence of the cross section does not depend on Q2, but that the phi cross section data at NMC are too low to be reproduced. The energy dependence of the t slopes suggests that J/psi data have a non-negligible diffractive background at HERA.Keywords
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