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Physical Review D

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

Daniël Boer^1,*, Wilco J. den Dunnen^2,†, and Aram Kotzinian^3,‡

¹Theory Group, KVI, University of Groningen, Zernikelaan 25, 9747 AA Groningen, The Netherlands
²Department of Physics and Astronomy, Vrije Universiteit Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
³Dipartimento di Fisica Teorica, Università di Torino, and INFN, Sezione di Torino, Via P. Giuria 1, I-10125 Torino, Italy and Yerevan Physics Institute, 2 Alikhanyan Brothers ST., 375036 Yerevan, Armenia

^*D.Boer@rug.nl
^†w.den.dunnen@vu.nl
^‡aram.kotzinian@cern.ch

Phys. Rev. D 83, 114032 – Published 15 June, 2011

DOI: https://doi.org/10.1103/PhysRevD.83.114032

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.

Article Text

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