Measurement of the parity-violating longitudinal single-spin asymmetry for $W^{\pm }$ boson production in polarized proton-proton collisions at $\sqrt{s}=500$GeV

Abstract

We report the first measurement of the parity violating single-spin asymmetries for midrapidity decay positrons and electrons from $W^{+}$ and $W^{-}$ boson production in longitudinally polarized proton-proton collisions at $\sqrt{s}=500$GeV by the STAR experiment at RHIC. The measured asymmetries, $A_L^{W^{+}}=-0.27\pm 0.10(stat.)\pm 0.02(syst.)\pm 0.03(norm.)$ and $A_L^{W^{-}}=0.14\pm 0.19(stat.)\pm 0.02(syst.)\pm 0.01(norm.)$, are consistent with theory predictions, which are large and of opposite sign. These predictions are based on polarized quark and antiquark distribution functions constrained by polarized DIS measurements.

arXiv comment6 pages, 4 figures, submitted to Physics Review Letters

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