Drell-Yan lepton angular distribution at small transverse momentum

Daniel Boer*, Werner Vogelsang

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

65 Citations (Scopus)

Abstract

We investigate the dependence of the Drell-Yan cross section on lepton polar and azimuthal angles, as generated by the lowest-order QCD annihilation and Compton processes. We focus, in particular, on the azimuthal-angular distributions, which are of the form cos phi and cos2 phi. At small transverse momentum q(T) of the lepton pair, q(T)<Q, with Q the pair mass, these terms are known to be suppressed relative to the phi-independent part of the Drell-Yan cross section by one or two powers of the transverse momentum. Nonetheless, as we show, like the phi-independent part they are subject to large logarithmic corrections, whose precise form, however, depends on the reference frame chosen. These logarithmic contributions ultimately require resummation to all orders in the strong coupling. We discuss the potential effects of resummation on the various angular terms in the cross section and on the Lam-Tung relation.

Original languageEnglish
Article number014004
Number of pages10
JournalPhysical Review D
Volume74
Issue number1
DOIs
Publication statusPublished - Jul-2006
Externally publishedYes

Keywords

  • MUON-PAIR PRODUCTION
  • QUARK FORM-FACTORS
  • TO-BACK JETS
  • QUANTUM CHROMODYNAMICS
  • HADRONIC COLLISIONS
  • INELASTIC-SCATTERING
  • BOSON PRODUCTION
  • NEGATIVE PIONS
  • CROSS-SECTIONS
  • HARD PROCESSES

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