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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, I. Alekseev, J. Alford, B. D. Andersdon, C. D. Anson, D. Arkhipkin, G. S. Averichev, J. Balewski, S. Bueltmann, D. Plyku
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, I. Alekseev, J. Alford, B. D. Andersdon, C. D. Anson, D. Arkhipkin, G. S. Averichev, J. Balewski, S. Bueltmann, D. Plyku
Physics Faculty Publications
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 √s = 500 GeV by the STAR experiment at RHIC. The measured asymmetries, A(L)(W+) = -0.27± 0.10(stat.) ± 0.02(syst.) ± 0.03(norm.) and A(L)(W-) = 0.14 ± 0.19(stat.) ± 0.02(syst.) ± 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 deep-inelastic scattering measurements.