The Hard Diffraction in Vector Meson Production at HERA
Abstract
Description
Results on elastic vector meson production at HERA are presented in the framework of perturbative QCD. The energy dependence of the cross section for J/Psi photoproduction and for rho electroproduction is studied. A full polarisation analysis, including the measurement of the 15 elements of the spin density matrix and of R=sigma_L/sigma_T, is presented for rho electroproduction. Finally heavier vector mesons (Psi' and Upsilon) production is discussed.
4 pages, 2 figures. Contribution to the proceedings of the "Rencontres de Moriond": 1999 QCD and High Energy Hadronic Interactions
4 pages, 2 figures. Contribution to the proceedings of the "Rencontres de Moriond": 1999 QCD and High Energy Hadronic Interactions