Journal of High Energy Physics
The Drell-Yan process is studied in the framework of TMD factorization in the Sudakov region s » Q2 » q2⊥ corresponding to recent LHC experiments with Q2 of order of mass of Z-boson and transverse momentum of DY pair ∼ few tens GeV. The DY hadronic tensors are expressed in terms of quark and quark-gluon TMDs with 1Q2 and 1Nc2 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 hadronic tensors depend on two leading-twist TMDs: f1 responsible for total DY cross section, and Boer-Mulders function h⊥1. The corresponding qualitative and semi-quantitative predictions seem to agree with LHC data on five angular coefficients A0 − A4 of DY pair production. The remaining three coefficients A5 − A7 are determined by quark-quark-gluon TMDs multiplied by extra 1Nc so they appear to be relatively small in accordance with LHC results.
Original Publication Citation
Balitsky, I. (2021). Drell-Yan angular lepton distributions at small x from TMD factorization. Journal of High Energy Physics, 2021(9), 1-82, Article 22. https://doi.org/10.1007/JHEP09(2021)022
Balitsky, Ian, "Drell-Yan Angular Lepton Distributions at Small x from TMD Factorization" (2021). Physics Faculty Publications. 544.