Single Transverse-Spin Asymmetry in Drell-Yan Production at Large and Moderate Transverse Momentum

Details Single Transverse-Spin Asymmetry in Drell-Yan Production at Large and Moderate Transverse Momentum Single Transverse-Spin Asymmetry in Drell-Yan Production at Large and Moderate Transverse Momentum

2006-04-04

arxiv.org/abs/hep-ph/0604023v1

Phys.Rev.D73:094017,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

29 pages, 10 figures

Scientific paper

10.1103/PhysRevD.73.094017

We study the single-transverse spin asymmetry for the Drell-Yan process. We consider production of the lepton pair at large transverse momentum, $q_\perp\sim Q$, where $Q$ is the pair's mass. The spin asymmetry is then of higher twist and may be generated by twist-three quark-gluon correlation functions. Expanding the result for $q_\perp\ll Q$, we make contact with the transverse-momentum-dependent QCD factorization involving the so-called Sivers functions. We find that the two mechanisms, quark-gluon correlations on one hand and the Sivers effect on the other, contain the same physics in this region. This ties the two together and imposes an important constraint on phenomenological studies of single transverse spin asymmetries.

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