PRODUCTION OF VECTOR-MESONS BY REAL AND VIRTUAL PHOTONS AT HIGH-ENERGIES

A model based on Reggeon field theory is used for the description of t he photo- and electroproduction of vector mesons (rho(0), omega, phi, J/psi) on the proton. Its main feature is the dependence of the Pomero n intercept on the virtuality of the photon. The few parameters of the model were determined by fitting the total cross sections for real an d virtual photons on the proton. This allows a parameter-free descript ion of the energy dependence of vector meson production. Very good agr eement with the existing high energy data is obtained.