Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-10-16
PoSDIFF2006:033,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 7 figures, report at the DIFFRACTION-06 workshop, Milos island, September 5 - 10, 2006
Scientific paper
We analyse spin effects in diffractive vector meson leptoproduction at small $x$ on the basis of the generalized parton distribution (GPD) approach. We take into account quark transverse degrees of freedom in the hard subprocess. We calculate amplitudes for the longitudinally and transversely polarized photons and vector mesons. Our results on the cross section and spin density matrix elements (SDME) are in fair agreement with the DESY experiments. Predictions for HERMES and COMPASS energy range are made. The predicted double spin longitudinal $A_{LL}$ asymmetry is not small at HERMES energies
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