Gauge invariance, causality and gluonic poles
High Energy Physics - Phenomenology
2014-11-20 v3
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 of we get the extra contributions, which naively do not have an imaginary phase. The single spin asymmetry for the Drell-Yan process is enhanced by the factor of two.
Cite
@article{arxiv.1003.1482,
title = {Gauge invariance, causality and gluonic poles},
author = {I. V. Anikin and O. V. Teryaev},
journal= {arXiv preprint arXiv:1003.1482},
year = {2014}
}
Comments
9 pages, 2 figures; References and acknowledgements added.