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Elastic Electroproduction of $\rh0$ and $J/Ψ$ Mesons at large $Q^2$ at HERA

Abstract

The total cross sections for the elastic electroproduction of and mesons for 8 GeV and GeV/c are measured at HERA with the H1 detector. The measurements are for an integrated electronproton luminosity of ~3~pb. The dependences of the total virtual photonproton () cross sections on , and the momentum transfer squared to the proton (), and, for the , the dependence on the polar decay angle (), are presented. The : cross section ratio is determined. The results are discussed in the light of theoretical models and of the interplay of hard and soft physics processes.