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Sivers effect and transverse single spin asymmetries in Drell-Yan processes

M. Anselmino, U. D'Alesio, F. Murgia

hep-pharXiv:hep-ph/0211198

Abstract

Sivers asymmetry, adopted 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 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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