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Transverse single spin asymmetry in the Drell-Yan process
Zhou, J Metz, A
Zhou, J
Metz, A
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Journal Article
Date
2012-07-05
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10.1103/PhysRevD.86.014001
Abstract
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. Compared to previous calculations we properly treat the transverse momentum expansion, and as a consequence 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. © 2012 American Physical Society.
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Physical Review D - Particles, Fields, Gravitation and Cosmology
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