Measurement of longitudinal spin asymmetries for weak boson production in polarized proton-proton collisions at RHIC - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physical Review Letters Year : 2014

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

L. Adamczyk
  • Function : Author

Abstract

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 DIS measurements, and show a preference for a sizable, positive up antiquark polarization in the range $0.05

Dates and versions

in2p3-00992854 , version 1 (19-05-2014)

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L. Adamczyk, W. Borowski, S. Kabana. Measurement of longitudinal spin asymmetries for weak boson production in polarized proton-proton collisions at RHIC. Physical Review Letters, 2014, 113, pp.072301. ⟨10.1103/PhysRevLett.113.072301⟩. ⟨in2p3-00992854⟩
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