Measurement of the Parity-Violating Longitudinal Single-Spin Asymmetry for W ± Boson Production in Polarized Proton-Proton Collisions at s = 500 GeV
M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, Igor Genadievich Alekseev et autres
We report the first measurement of the parity-violating single-spin asymmetries for midrapidity decay positrons and electrons from ${W}^{+}$ and ${W}^{\ensuremath{-}}$ boson production in longitudinally polarized proton-proton collisions at $\sqrt{s}=500\text{ }\text{ }\mathrm{GeV}$ by the STAR experiment at RHIC. The measured asymmetries, ${A}_{L}^{{W}^{+}}=\ensuremath{-}0.27\ifmmode\pm\else\textpm\fi{}0.10(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.02(\mathrm{syst}.)\ifmmode\pm\else\textpm\fi{}0.03(\mathrm{norm}.)$ and …
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57 citations
Physical Review Letters