On high energy exclusive leptoproduction of the rho meson up to twist 3

Details On high energy exclusive leptoproduction of the rho meson up to twist 3 On high energy exclusive leptoproduction of the rho meson up to twist 3

2011-09-23

arxiv.org/abs/1109.5050v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, 4 figures, To be published in the proceedings of the 2011 Europhysics Conference on High Energy Physics-HEP 2011, Jul

Scientific paper

The Regge inspired k_T-factorization scheme expresses the scattering amplitude for exclusive leptoproduction of a light vector meson rho in terms of two impact factors, one for the gamma* - rho transition and the other one for the nucleon to nucleon transition, with, at leading order, a two "reggeized" gluon exchange in the t-channel. We report here on a recent phenomenological study where we apply a previously developped scheme which consistently takes into account the twist 3 distribution amplitudes for transversely polarized rho meson. The computation of the gamma* to rho impact factor are performed within collinear factorization of QCD, up to the twist 3 level, based on the Collinear Factorization scheme applied to the amplitudes gamma*g to g rho . Our results are in good agreement with high energy experimental data for the ratios of helicity amplitudes.

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