Transverse single spin asymmetries in Drell-Yan processes

Details Transverse single spin asymmetries in Drell-Yan processes Transverse single spin asymmetries in Drell-Yan processes

2002-10-28

arxiv.org/abs/hep-ph/0210371v1

Phys.Rev. D67 (2003) 074010

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 24+1 pages, 7 ps figures, uses epsfig.sty

Scientific paper

10.1103/PhysRevD.67.074010

Recently, it has been shown, contrary to previous beliefs, that the k_T distribution of quarks in a transversely polarized proton can be asymmetric. This ``Sivers effect'' had already been used to explain transverse single spin asymmetries (SSA) observed in inclusive pion production, p(transv. polarized) p --> pion + X and p-bar(transv. polarized) p --> pion + X. In such channels, however, other mechanisms, like the ``Collins effect'' (a k_T asymmetric fragmentation of a transversely polarized quark into pions), may generate SSA. The Sivers asymmetry is used here to compute SSA in Drell-Yan processes; in this case, by considering the differential cross-section in the lepton-pair invariant mass, rapidity and transverse momentum, other mechanisms which may originate SSA cannot contribute. Estimates for RHIC experiments are given.

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