The target asymmetry in hard vector-meson electroproduction and parton angular momenta

Details The target asymmetry in hard vector-meson electroproduction and parton angular momenta The target asymmetry in hard vector-meson electroproduction and parton angular momenta

2008-09-24

arxiv.org/abs/0809.4126v1

Eur.Phys.J.C 2009:1-11,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, 11 figures, latex

Scientific paper

10.1140/epjc/s10052-008-0833-x

The target asymmetry for electroproduction of vector mesons is investigated within the handbag approach. While the generalized parton distribution (GPD) H is taken from a previous analysis of the elctroproduction cross section, we here construct the GPD E from double distributions and constrain it by the Pauli form factors of the nucleon, positivity bounds and sum rules. Predictions for the target asymmetry are given for various vector mesons and discussed how experimental data on the asymmetry will further constrain E and what we may learn about the angular momenta the partons carry.

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