Exclusive electroproduction of rhoT meson with twist three accuracy

Details Exclusive electroproduction of rhoT meson with twist three accuracy Exclusive electroproduction of rhoT meson with twist three accuracy

2010-11-08

arxiv.org/abs/1011.1854v1

PoS ICHEP2010:121,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, to appear in the proceedings of 35th International Conference on High Energy Physics, (ICHEP 2010), Paris, France, Ju

Scientific paper

Exclusive electroproduction of vector mesons is a crucial way to probe QCD factorization properties. Such a factorization is up to now only proven, at the twist 2 level, for a longitudinaly polarized meson. It is crucial to extend our understanding to the case of transversely polarized vector mesons. As a first step in this direction, we evaluate the impact factor of the transition gamma* -> rhoT, which is the relevant part of the amplitude within the kt-factorization approach valid at large energies, taking into account the twist 3 contributions, coming both from quark antiquark and from quark antiquark gluon correlators. We show that a gauge invariant expression is obtained with the help of QCD equations of motion.

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