Vector meson photoproduction and problem of gauge invariance

Abstract

We discuss the problem of gauge invariance of the vector meson photoproduction at small $x$ within the two-gluon exchange model. It is found that the gauge invariance is fulfilled if one includes the graphs with higher Fock states in the meson wave function. Obtained results are used to estimate the amplitudes with longitudinal and transverse photon and vector meson polarization.

5 pages, 2 figures, report at X-th Workshop On High Energy Spin Physics, Dubna, September 16-20, 2003. Some typing errors was corrected

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