Hard diffractive processes and non-perturbative matrix elements beyond leading twist: rhoT-meson production
Abstract
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.
Cite
@article{arxiv.0909.4042,
title = {Hard diffractive processes and non-perturbative matrix elements beyond leading twist: rhoT-meson production},
author = {I. V. Anikin and D. Yu. Ivanov and B. Pire and L. Szymanowski and S. Wallon},
journal= {arXiv preprint arXiv:0909.4042},
year = {2009}
}
Comments
12 pages, 5 figures, 10th Workshop on non-perturbative QCD, Paris, 8-12 June 2009