Exclusive photoproduction of a heavy vector meson in QCD

Details Exclusive photoproduction of a heavy vector meson in QCD Exclusive photoproduction of a heavy vector meson in QCD

2004-01-18

arxiv.org/abs/hep-ph/0401131v1

Eur.Phys.J. C34 (2004) 297-316

Physics

High Energy Physics

High Energy Physics - Phenomenology

37 pages, LATEX, 17 figures

Scientific paper

10.1140/epjc/s2004-01712-x

The process of exclusive heavy vector meson photoproduction, gamma p -> V p, is studied in the framework of QCD factorization. The mass of the produced meson, V = Upsilon or J/Psi, provides a hard scale for the process. We demonstrate, that in the heavy quark limit and at the one-loop order in perturbation theory, the amplitude factorizes in a convolution of a perturbatively calculable hard-scattering amplitude with the generalized parton densities and the nonrelativistic QCD matrix element _V. We evaluate the hard scattering amplitude at one-loop order and compare the data with theoretical predictions using an available model for generalized parton distributions.

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