Double Sivers effect asymmetries and their impact on transversity measurements at RHIC

Daniel Boer*, Wilco J. den Dunnen, Aram Kotzinian

*Corresponding author for this work

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3 Citations (Scopus)

Abstract

We study double transverse spin asymmetries in the Drell-Yan process at measured transverse momentum of the lepton pair. Contrary to what a collinear factorization approach would suggest, a nonzero double transverse spin asymmetry in the laboratory frame a priori does not imply nonzero transversity. Transverse momentum dependent (TMD) effects, such as the double Sivers effect, in principle form a background. Using the current knowledge of the relevant TMDs, we estimate their contribution in the laboratory frame for Drell-Yan and W production at RHIC and point out a cross-check asymmetry measurement to bound the TMD contributions. We also comment on the transverse momentum integrated asymmetries that only receive power suppressed background contributions.

Original languageEnglish
Article number114032
Number of pages11
JournalPhysical Review D
Volume83
Issue number11
DOIs
Publication statusPublished - 15-Jun-2011

Keywords

  • STRUCTURE-FUNCTION G2(X
  • DRELL-YAN-PROCESS
  • PARTON DISTRIBUTIONS
  • SPIN PHYSICS
  • HIGHER TWIST
  • COLLISIONS
  • EVOLUTION
  • MOMENTUM
  • QCD
  • POLARIZATION

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