Single Transverse-Spin Asymmetries in Drell-Yan Processes
Gabriele Re Calegari, Philip G. Ratcliffe
TL;DR
This paper re-evaluates single transverse-spin asymmetries in Drell-Yan processes using twist-3 contributions within collinear factorisation, providing detailed calculations for comparison with previous results.
Contribution
It offers a comprehensive re-calculation of the asymmetry, clarifying discrepancies in earlier results by including detailed twist-3 contributions.
Findings
Revised asymmetry values consistent with previous literature
Detailed derivation of twist-3 contributions in collinear factorisation
Clarification of factors affecting asymmetry calculations
Abstract
The asymmetry in the angular distribution of Drell--Yan dilepton pairs generated in collisions where just one nucleon is transversely polarised has been examined in the literature with a variety of results, mainly differing by factors of two. We re-evaluate the asymmetry via twist-3 contributions in collinear factorisation. In order to allow complete and in-depth comparison with existing calculations, we supply all calculational details.
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