Abstract
The Drell-Yan hadronic tensor for electromagnetic (EM) current is calculated in the Sudakov region \( s\gg {Q}^2\gg {q}_{\perp}^2 \) with \( \frac{1}{Q^2} \) accuracy, first at the tree level and then with the double-log accuracy. It is demonstrated that in the leading order in Nc the higher-twist quark-quark-gluon TMDs reduce to leading-twist TMDs due to QCD equation of motion. The resulting tensor for unpolarized hadrons is EM gauge-invariant and depends on two leading-twist TMDs: f1 responsible for total DY cross section, and Boer-Mulders function \( {h}_1^{\perp } \). The order-of-magnitude estimates of angular distributions for DY process seem to agree with LHC results at corresponding kinematics.
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Balitsky, I. Gauge-invariant TMD factorization for Drell-Yan hadronic tensor at small x. J. High Energ. Phys. 2021, 46 (2021). https://doi.org/10.1007/JHEP05(2021)046
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DOI: https://doi.org/10.1007/JHEP05(2021)046