Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-01-26
Eur.Phys.J.C42:281-301,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
40 pages, 22 figures (using LATEX), v2: beginning of Sect. 3 is rewritten, a discussion on alternative choices of the slopes i
Scientific paper
10.1140/epjc/s2005-02298-5
We analyze electroproduction of light vector mesons at small Bjorken-x in an approach that includes the gluonic generalized parton distributions and a partonic subprocess, gamma g --> (q q-bar) g, q q-bar --> V. The subprocess is calculated to lowest order of perturbative QCD taking into account the transverse momenta of the quark and antiquark as well as Sudakov suppressions. Our approach allows to investigate the transition amplitudes for all kind of polarized virtual photons and polarized vector mesons. Modelling the generalized parton distributions through double distributions and using simple Gaussian wavefunctions for the vector mesons, we compute the longitudinal and transverse cross sections at large photon virtualities as well as the spin density matrix elements for the vector mesons. Our results are in fair agreement with the findings of recent experiments performed at HERA.
Goloskokov S. V.
Kroll Peter
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