Journal of High Energy Physics
The Drell-Yan hadronic tensor for electromagnetic (EM) current is calculated in the Sudakov region s ≫ Q2 ≫q⊥2 with 1Q² 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 h1⊥. The order-of-magnitude estimates of angular distributions for DY process seem to agree with LHC results at corresponding kinematics.
Original Publication Citation
Balitsky, I. (2021). Gauge-invariant TMD factorization for Drell-Yan hadronic tensor at small x. Journal of High Energy Physics, 2021(5), 69 pp., Article 46. https://doi.org/10.1007/JHEP05(2021)046
Balitsky, Ian, "Gauge-Invariant TMD Factorization for Drell-Yan Hadronic Tensor at Small x" (2021). Physics Faculty Publications. 520.