Spin Effects and Amplitude Structure in Vector Meson Photoproduction at Small $x$

Abstract

An analysis of light vector meson photoproduction at small $x$ on the basis of the generalized parton distribution (GPD) approach is presented. Our results on the cross section and spin density matrix elements (SDME) are in fair agreement with DESY experiments. The predicted double spin longitudinal $A_{LL}$ asymmetry is not small at HERMES energies.

Comments: LateX file (use wrapfile.sty), 4 figures, report at the XI Workshop on High Energy Spin Physics, Dubna, Russia, September 27 - October 1, 2005