Transverse single spin asymmetry in the Drell-Yan process

Details Transverse single spin asymmetry in the Drell-Yan process Transverse single spin asymmetry in the Drell-Yan process

2010-11-26

arxiv.org/abs/1011.5871v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages

Scientific paper

We revisit the transverse single spin asymmetry in the angular distribution of a Drell-Yan dilepton pair. We study this asymmetry by using twist-3 collinear factorization, and we obtain the same result both in covariant gauge and in the light-cone gauge. Moreover, we have checked the electromagnetic gauge invariance of our calculation. Our final expression for the asymmetry differs from all the previous results given in the literature. The overall sign of this asymmetry is as important as the sign of the Sivers asymmetry in Drell-Yan.

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