Gauge invariance, gluonic poles and single spin asymmetry in Drell-Yan processes
High Energy Physics - Phenomenology
2011-08-17 v1
Abstract
We explore the electromagnetic gauge invariance of the hadron tensor of the Drell-Yan process with one transversely polarized hadron. The special role is played by the contour gauge for gluon fields. The prescription for the gluonic pole in the twist 3 correlator is related to causality property and compared with the prescriptions for exclusive hard processes. As a result we get the extra contributions, which naively do not have an imaginary phase. The single spin asymmetry for the Drell-Yan process is accordingly enhanced by the factor of two.
Keywords
Cite
@article{arxiv.1011.6203,
title = {Gauge invariance, gluonic poles and single spin asymmetry in Drell-Yan processes},
author = {I. V. Anikin and O. V. Teryaev},
journal= {arXiv preprint arXiv:1011.6203},
year = {2011}
}
Comments
5 pages, 1 figure; Contributed to The 19th International Spin Physics Symposium, Sept 27 - Oct 2, 2010, Juelich, Germany