Measurement of the Parity-Violating Longitudinal Single-Spin Asymmetry for W(+/-) Boson Production in Polarized Proton-Proton Collisions at root s=500 GeV
| Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
|---|---|
| Data(s) |
18/04/2012
18/04/2012
2011
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| Resumo |
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 root 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. RHIC Operations Group at BNL RCF at BNL NERSC Center at LBNL Open Science Grid consortium Offices of NP and HEP within the U.S. DOE Office of Science U.S. NSF National Science Foundation Sloan Foundation Deutsche Forschungsgemeinschaft - DFG ""Origin and Structure of the Universe"" of Germany Centre National de la Recherche Scientifique - CNRS/IN2P3 FAPESP CNPq of Brazil MES Ministry of Ed. and Sci. of the Russian Federation NNSFC of China CAS of China MoST of China MoE of China GACR of the Czech Republic MSMT of the Czech Republic FOM of the Netherlands NWO of the Netherlands (DAE) Department of Atomic Energy, India (DST) Department of Science and Technology, India (CSIR) Council of Scientific and Industrial Research - India Polish Ministry of Sci. and Higher Ed. Korea Research Foundation (KRF) Ministry of Sci., Ed. and Sports of the Rep. Of Croatia RosAtom of Russia |
| Identificador |
PHYSICAL REVIEW LETTERS, v.106, n.6, 2011 0031-9007 http://producao.usp.br/handle/BDPI/16284 10.1103/PhysRevLett.106.062002 |
| Idioma(s) |
eng |
| Publicador |
AMER PHYSICAL SOC |
| Relação |
Physical Review Letters |
| Direitos |
restrictedAccess Copyright AMER PHYSICAL SOC |
| Palavras-Chave | #DISTRIBUTIONS #PHYSICS #Physics, Multidisciplinary |
| Tipo |
article original article publishedVersion |