Global analysis of Sivers and Collins asymmetries within the TMD factorization

TL;DR

This paper performs a comprehensive global analysis of Sivers, transversity, and Collins functions within TMD factorization, incorporating recent experimental data to enhance the precision of quark distribution extractions.

Contribution

It introduces a new global fit that integrates latest experimental data, improving the accuracy of Sivers and transversity distributions and tensor charge estimates.

Findings

Enhanced precision of d and dbar quark distributions.

Improved constraints on tensor charge.

Consistent description of multiple processes within TMD framework.

Abstract

We present a global analysis of Sivers functions, transversity distribution functions, and Collins fragmentation functions within the transverse momentum dependent factorization. This analysis encompasses the latest data from semi-inclusive deep inelastic scattering, Drell-Yan, and W/Z-boson production processes as recently reported by the COMPASS and STAR Collaborations. Upon integrating the new data into our fitting, the precision of the extracted d and dbar quark Sivers and transversity distributions, as well as the tensor charge, is notably improved.