Study of Spin through Gluon Poles

Abstract

Based on the use of contour gauge and collinear factorization, we propose a new set of single spin asymmetry which can be measured in polarized Drell-Yan process by SPD@NICA. We stress that the discussed single transverse spin asymmetries exist owing to the gluon poles manifesting in the twist-3 or twist-2$\otimes$twist-3 parton distributions related to the transverse-polarized Drell-Yan process.

Comments: 5 pages, 1 figure, Contribution to the proceedings of XVII Workshop on High Energy Spin Physics DSPIN-17, September 11-15, Dubna