QCD factorization at fixed Q^2(1-x)

Details QCD factorization at fixed Q^2(1-x) QCD factorization at fixed Q^2(1-x)

2009-03-28

arxiv.org/abs/0903.4962v1

Acta Phys.Polon.B40:2119-2130,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk at Epiphany meeting in commemoration of Jan Kwiecinski, Krakow, January 2009. 12 pages, 6 figures

Scientific paper

Amplitudes of hard {\it exclusive} processes such as \gamma^*(Q^2) N \to \gamma Y, where Y=N (DVCS) or any other state with a limited mass (M_Y^2 << Q^2), factorize into a hard subprocess amplitude and a target (transition) GPD. The corresponding {\it inclusive} cross section, summed over all states Y of a given (limited) mass, is then given by the discontinuity of a forward multiparton distribution. An application to the Drell-Yan process \pi^+ N \to \gamma^*(x_F,Q^2)+Y allows to explain the observed longitudinal polarization of the virtual photon at high x_F.

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