Asymmetries associated with higher twists: gauge invariance, gluonic poles and twist three

Details Asymmetries associated with higher twists: gauge invariance, gluonic poles and twist three Asymmetries associated with higher twists: gauge invariance, gluonic poles and twist three

2012-01-12

arxiv.org/abs/1201.2569v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given at XIV International Workshop on High Energy Physics "DSPIN-11", Dubna, Russia, September 20 - 24, 2011

Scientific paper

We explore the electromagnetic gauge invariance of the hadron tensor of the Drell-Yan process with one transversely polarized hadron. Due to the special role of the contour gauge for gluon fields, the prescription for the gluonic pole in the twist 3 correlator can be related to the causality prescriptions for exclusive hard processes. Because of this, we find 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.

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