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Examines one-loop QCD corrections affecting single transverse spin asymmetry in Drell-Yan processes, highlighting implications for gauge invariance.
A bstract 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 q̄(x) q ¯ x and T F ( x 1 , x 2 ) are presented.
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Guang-Peng Zhang (2026) studied this question.
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