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Updated: Jul 2, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 16, 2013
Measurement of the Transverse Single-Spin Asymmetry in p^{↑}+p→W^{±}/Z^{0} at RHIC
L Adamczyk1, J K Adkins2, G Agakishiev3
1AGH University of Science and Technology, FPACS, Cracow 30-059, Poland.
Abstract:
We present the measurement of the transverse single-spin asymmetry of weak boson production in transversely polarized proton-proton collisions at sqrt[s]=500 GeV by the STAR experiment at RHIC. The measured observable is sensitive to the Sivers function, one of the transverse-momentum-dependent parton distribution functions, which is predicted to have the opposite sign in proton-proton collisions from that observed in deep inelastic lepton-proton scattering. These data provide the first experimental investigation of the nonuniversality of the Sivers function, fundamental to our understanding of QCD.
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