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Measurement of the Parity-Violating Longitudinal Single-Spin Asymmetry for W(+/-) Boson Production in Polarized Proton-Proton Collisions at root s=500 GeV
- 1.0366157 - ÚJF 2012 RIV US eng J - Journal Article
Aggarwal, M. M. - Ahammed, Z. - Alekseev, I. - Bielčík, J. - Bielčíková, Jana - Chaloupka, Petr - Kapitán, Jan - Šumbera, Michal - Tlustý, David … Total 363 authors
Measurement of the Parity-Violating Longitudinal Single-Spin Asymmetry for W(+/-) Boson Production in Polarized Proton-Proton Collisions at root s=500 GeV.
Physical Review Letters. Roč. 106, č. 6 (2011), 062002/1-062002/5. ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA MŠMT LA09013
Institutional research plan: CEZ:AV0Z10480505
Keywords : DISTRIBUTIONS * PHYSICS
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 7.370, year: 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 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.
Permanent Link: http://hdl.handle.net/11104/0201231
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