ar X iv : h ep - p h / 04 01 13 1 v 1 1 8 Ja n 20 04 Exclusive photoproduction of a heavy vector meson in QCD
نویسندگان
چکیده
The process of exclusive heavy vector meson photoproduction, γp → V p, is studied in the framework of QCD factorization. The mass of the produced meson, V = Υ or J/Ψ, 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 O 1 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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