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

作者：Boer Daniel^*; den Dunnen Wilco J; Kotzinian Aram

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2011, 83(11): 114032.

DOI：10.1103/PhysRevD.83.114032

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.

• 出版日期2011-6-15