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arXiv · 1103.0908

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

Daniel Boer·Wilco J. den Dunnen·Aram Kotzinian
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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. 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.

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Daniel Boer, Wilco J. den Dunnen, Aram Kotzinian. 2011-06-30. Double Sivers effect asymmetries and their impact on transversity measurements at RHIC. https://doi.org/10.1103/physrevd.83.114032

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