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.

6 pages, 4 figures, submitted to Physics Review Letters

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Cited by in corpus (11)

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• Cross Section and Parity Violating Spin Asymmetries of W^+/- Boson Production in Polarized p+p Collisions at sqrt(s)=500 GeV
• Flavor Structure of the Nucleon Sea
• NNLO Benchmarks for Gauge and Higgs Boson Production at TeV Hadron Colliders
• Transverse spin asymmetries for W-production in proton-proton collisions
• Spin physics and TMD studies at A Fixed-Target ExpeRiment at the LHC (AFTER@LHC)
• Single-Spin Asymmetries in W Boson Production at Next-to-Leading Order
• General positivity bounds for spin observables in particle inclusive production
• Analysis Tools for Discovering Strong Parity Violation at Hadron Colliders
• Recent results of gluon and sea quark polarization measurements in polarized proton-proton collisions at STAR