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Updated: Jul 29, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Measurement of longitudinal spin asymmetries for weak boson production in polarized proton-proton collisions at RHIC
L Adamczyk1, J K Adkins2, G Agakishiev3
1AGH University of Science and Technology, Cracow 30-059, Poland.
Abstract:
We report measurements of single- and double-spin asymmetries for W^{±} and Z/γ^{*} boson production in longitudinally polarized p+p collisions at sqrt[s]=510 GeV by the STAR experiment at RHIC. The asymmetries for W^{±} were measured as a function of the decay lepton pseudorapidity, which provides a theoretically clean probe of the proton's polarized quark distributions at the scale of the W mass. The results are compared to theoretical predictions, constrained by polarized deep inelastic scattering measurements, and show a preference for a sizable, positive up antiquark polarization in the range 0.05
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