Twist-3 Double Spin Asymmetries in Drell-Yan Processes

Abstract

We study double spin asymmetries in Drell-Yan processes in which one initial hadron is transversely polarized and another one is longitudinally polarized. The complete part of the hadronic tensor relevant to asymmetries is derived. This part consists of twist-2 and twist-3 parton distributions and is gauge invariant. We construct some observables which can be used to extract these parton distributions from experimental measurements.

arXiv commentPublished version in Phys.Rev.D

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• Transverse momentum dependent operator expansion at next-to-leading power