HAL : in2p3-00517035, version 1
 arXiv : 1009.0326
 Physical Review Letters 106 (2011) 062002
 Measurement of the parity-violating longitudinal single-spin asymmetry for $W^{\pm}$ boson production in polarized proton-proton collisions at $\sqrt{s} = 500$GeV
 STAR Collaboration(s)
 (2011)
 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, $A^{W^+}_{L}=-0.27\pm 0.10\;({\rm stat.})\pm 0.02\;({\rm syst.}) \pm 0.03\;({\rm norm.})$ and $A^{W^-}_{L}=0.14\pm 0.19\;({\rm stat.})\pm 0.02 \;({\rm syst.})\pm 0.01\;({\rm norm.})$, 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.
 Thème(s) : Physique/Physique des Hautes Energies - Expérience
 Lien vers le texte intégral : http://fr.arXiv.org/abs/1009.0326
 in2p3-00517035, version 1 http://hal.in2p3.fr/in2p3-00517035 oai:hal.in2p3.fr:in2p3-00517035 Contributeur : Dominique Girod <> Soumis le : Lundi 13 Septembre 2010, 14:06:23 Dernière modification le : Mardi 19 Avril 2011, 14:52:20