Drell-Yan angular lepton distributions at small x from TMD factorization.

Balitsky, Ian

doi:10.1007/jhep09(2021)022

Drell-Yan angular lepton distributions at small x from TMD factorization.

Journal Article · Mon Sep 06 00:00:00 EDT 2021 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/jhep09(2021)022· OSTI ID:1819085

Balitsky, Ian ^[1]

Old Dominion Univ., Norfolk, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

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 N_c 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.

View Accepted Manuscript (DOE)

Research Organization:: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 1819085

Report Number(s):: DOE/OR/23177-5225; JLAB-THY--21-3407; arXiv:2105.13391

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 9 Vol. 2021; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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