Gauge invariance, causality and gluonic poles

Details Gauge invariance, causality and gluonic poles Gauge invariance, causality and gluonic poles

2010-03-07

arxiv.org/abs/1003.1482v3

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 2 figures; References and acknowledgements added.

Scientific paper

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.

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