Hard diffractive processes and non-perturbative matrix elements beyond leading twist: rhoT-meson production

Details Hard diffractive processes and non-perturbative matrix elements beyond leading twist: rhoT-meson production Hard diffractive processes and non-perturbative matrix elements beyond leading twist: rhoT-meson production

2009-09-22

arxiv.org/abs/0909.4042v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 5 figures, 10th Workshop on non-perturbative QCD, Paris, 8-12 June 2009

Scientific paper

Within the kt-factorization approach, we evaluate the impact factor of the transition gamma* -> rhoT taking into account the twist 3 contributions. We show that a gauge invariant expression is obtained with the help of QCD equations of motion. More generally, relying on these equations and on the invariance under rotation on the light-cone of the factorized amplitude, the non-perturbative Distribution Amplitudes can be reduced to a minimal set. This opens the way to a consistent treatment of factorization for exclusive processes with a transversally polarized vector meson. We prove the equivalence of two proposed parametrizations of the rhoT distribution amplitudes.

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