One-loop QCD corrections to SSA in unweighted Drell-Yan processes
Abstract
We study one-loop QCD corrections to the single transverse spin asymmetry in Drell-Yan process. The invariant mass of virtual photon and angular distributions of final lepton in Collins-Soper frame are measured. Especially, the transverse momentum of virtual photon is integrated out. Collinear twist-3 factorization formalism is adopted for the asymmetry. We use Feynman gauge in this work. To eliminate dependent twist-3 distribution functions, equation of motion for quark is used. The results satisfy both QED and QCD gauge invariance. It is confirmed that all divergences from virtual and real corrections can be removed consistently by collinear subtraction. Finite hard coefficients for the convolution of and are presented.
Cite
@article{arxiv.2509.11561,
title = {One-loop QCD corrections to SSA in unweighted Drell-Yan processes},
author = {Guang-Peng Zhang},
journal= {arXiv preprint arXiv:2509.11561},
year = {2026}
}
Comments
One mistake in virtual correction is corrected. After this all divergences can be removed by collinear subtraction. There is no breaking of twist-3 factorization for this process. Presentation is improved to match the published version