Test the time-reversal modified universality of the Sivers function

Abstract

We derive the time-reversal modified universality for both quark and gluon Sivers function from the parity and time-reversal invariance of QCD. We calculate the single transverse-spin asymmetry of inclusive lepton from the decay of $W$ bosons in polarized proton-proton collision at RHIC, in terms of the Sivers function. We find that although the asymmetry is diluted from the $W$ decay, the lepton asymmetry is at the level of several percent and is measurable for a good range of lepton rapidity at RHIC. We argue that this measurable lepton asymmetry at RHIC is an excellent observable for testing the time-reversal modified universality of the Sivers function.

4 pages, 4 figures

References in corpus (5)

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• k_T factorization is violated in production of high-transverse-momentum particles in hadron-hadron collisions
• Azimuthal and Single Spin Asymmetries in Hard Scattering Processes
• Evolution of twist-3 multi-parton correlation functions relevant to single transverse-spin asymmetry
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