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We explore the electromagnetic gauge invariance of the hadron tensor of theDrell-Yan process with one transversely polarized hadron. The special role isplayed by the contour gauge for gluon fields. The prescription for the gluonicpole in the twist 3 correlator is related to causality property and comparedwith the prescriptions for exclusive hard processes. As a result we get theextra contributions, which naively do not have an imaginary phase. The singlespin asymmetry for the Drell-Yan process is accordingly enhanced by the factorof two.

Gauge invariance, gluonic poles and single spin asymmetry in Drell-Yan processes