Exclusive electroproduction of rhoT meson with twist three accuracy
I. V. Anikin, D. Yu. Ivanov, B. Pire, L. Szymanowski, S. Wallon

TL;DR
This paper advances the understanding of QCD factorization by calculating the impact factor for the exclusive electroproduction of transversely polarized rho mesons, including twist 3 contributions, within the kt-factorization framework.
Contribution
It provides the first calculation of the gamma* -> rhoT impact factor at twist 3, incorporating quark-antiquark and quark-antiquark-gluon correlators with gauge invariance.
Findings
Impact factor computed with twist 3 accuracy.
Gauge invariance achieved via QCD equations of motion.
Foundation for extending factorization proofs to transversely polarized mesons.
Abstract
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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Taxonomy
TopicsQuantum Chromodynamics and Particle Interactions · Particle physics theoretical and experimental studies · High-Energy Particle Collisions Research
