We present an analysis of genuine twist-3 quark contributions to the amplitude of exclusive electro-production of transversely polarized vector mesons. Using the formalism based on the momentum representation we calculated all the genuine twist-3 terms of quark contributions to gamma_T^* --> rho_T amplitude. We found that these terms can not be factorized owing to the existence of the infrared divergencies in the amplitude of hard sub-processes.
@article{arxiv.hep-ph/0208126,
title = {Non-factorized genuine twist 3 in exclusive electro-production of vector mesons},
author = {I. V. Anikin and O. V. Teryaev},
journal= {arXiv preprint arXiv:hep-ph/0208126},
year = {2009}
}
Comments
4 pages. Talk presented by I.V. Anikin at European Workshop on the QCD Structure of the Nucleon (QCD-N'02), Ferrara, Italy, 3-6 Apr 2002 (to appear in Nucl. Phys. A, Proc. Suppl.)