Twist-3 Double Spin Asymmetries in Drell-Yan Processes
M.C. Hu, J.P. Ma, Z.Y. Pang, G.P. Zhang
TL;DR
This paper investigates double spin asymmetries in Drell-Yan processes involving mixed polarization states, deriving gauge-invariant twist-2 and twist-3 contributions and proposing observables for experimental extraction.
Contribution
It provides a complete derivation of the relevant hadronic tensor including twist-2 and twist-3 distributions, and suggests measurable observables to access these distributions.
Findings
Derived gauge-invariant hadronic tensor with twist-2 and twist-3 terms
Identified observables for experimental extraction of spin-dependent distributions
Enhanced understanding of 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.
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