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Measurement of longitudinal spin asymmetries for weak boson production in polarized proton-proton collisions at RHIC

  • Adamczyk, L.
  • Adkins, J. K.
  • Agakishiev, G.
  • Aggarwal, M. M.
  • Ahammed, Z.
  • Alekseev, I.
  • Alford, J.
  • Anson, C. D.
  • Aparin, A.
  • Arkhipkin, D.
  • Aschenauer, E. C.
  • Averichev, G. S.
  • Balewski, J.
  • Banerjee, A.
  • Beavis, D. R.
  • Bellwied, R.
  • Bhasin, A.
  • Bhati, A. K.
  • Bhattarai, P.
  • Bichsel, H.
  • And 340 more
Published Article
Publication Date
Aug 12, 2014
Submission Date
Apr 28, 2014
DOI: 10.1103/PhysRevLett.113.072301
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We report measurements of single- and double- spin asymmetries for $W^{\pm}$ and $Z/\gamma^*$ boson production in longitudinally polarized $p+p$ collisions at $\sqrt{s} = 510$ GeV by the STAR experiment at RHIC. The asymmetries for $W^{\pm}$ 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 recent polarized deep inelastic scattering measurements, and show a preference for a sizable, positive up antiquark polarization in the range $0.05<x<0.2$.

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