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arXiv · 1011.6203

Gauge invariance, gluonic poles and single spin asymmetry in Drell-Yan processes

I. V. Anikin·O. V. Teryaev
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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.

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I. V. Anikin, O. V. Teryaev. 2010-11-29. Gauge invariance, gluonic poles and single spin asymmetry in Drell-Yan processes. https://doi.org/10.1088/1742-6596%2F295%2F1%2F012057

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