Eur. Phys. J. C (2014) 74: 2769
https://doi.org/10.1140/epjc/s10052-014-2769-7

Regular Article - Theoretical Physics

Single transverse-spin asymmetries in Drell–Yan processes

¹ Dipartimento di Scienza e Alta Tecnologia, Università degli Studi dell’Insubria-sede di Como, via Valleggio 11, 22100 , Como, Italy
² Istituto Nazionale di Fisica Nucleare-sezione di Milano Bicocca, Piazza della Scienza 3, 20126 , Milano, Italy

^* e-mail: philip.ratcliffe@uninsubria.it

Received: 20 July 2013
Accepted: 29 January 2014
Published online: 5 March 2014

Abstract

The asymmetry in the angular distribution of Drell–Yan dilepton pairs in collisions where just one nucleon is transversely polarised has been examined in the literature with a variety of results, differing mainly by factors of 2. 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.