On the cos 2 phi asymmetry in unpolarized leptoproduction
High Energy Physics - Phenomenology
2008-11-26 v1
Abstract
We investigate the origin of the cos 2 phi azimuthal asymmetry in unpolarized semiinclusive DIS. The contributions to this asymmetry arising from the intrinsic transverse motion of quarks are explicitly evaluated, and predictions for the HERMES and COMPASS kinematic regimes are presented. We show that the effect of the leading-twist Boer-Mulders function h_1^perp(x, k_T^2), which describes a correlation between the transverse momentum and the transverse spin of quarks, is quite significant and may also account for a part of the cos 2 phi asymmetry measured by ZEUS in the perturbative domain.
Cite
@article{arxiv.hep-ph/0512145,
title = {On the cos 2 phi asymmetry in unpolarized leptoproduction},
author = {Vincenzo Barone and Zhun Lu and Bo-Qiang Ma},
journal= {arXiv preprint arXiv:hep-ph/0512145},
year = {2008}
}
Comments
11 pages, 7 figures