Abstract
The Drell-Yan process is studied in the framework of TMD factorization in the Sudakov region s » Q2 » \( {q}_{\perp}^2 \) 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 \( \frac{1}{Q^2} \) and \( \frac{1}{N_c^2} \) 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 \( {h}_1^{\perp } \). 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 \( \frac{1}{N_c} \) so they appear to be relatively small in accordance with LHC results.
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Balitsky, I. Drell-Yan angular lepton distributions at small x from TMD factorization.. J. High Energ. Phys. 2021, 22 (2021). https://doi.org/10.1007/JHEP09(2021)022
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DOI: https://doi.org/10.1007/JHEP09(2021)022