Measurement of the Parity-Violating Longitudinal Single-Spin Asymmetry for W± Boson Production in Polarized Proton-Proton Collisions at √s=500  GeV

Aggarwal, M. M. and Planinić, Mirko and Poljak, Nikola and Zoulkarneeva, Y. (STAR Collaboration) (2011) Measurement of the Parity-Violating Longitudinal Single-Spin Asymmetry for W± Boson Production in Polarized Proton-Proton Collisions at √s=500  GeV. Physical Review Letters, 106 (6). pp. 62002-6. ISSN 0031-9007

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Abstract

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, AW+L=−0.27±0.10(stat.)±0.02(syst.)±0.03(norm.) and AW−L=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.

Item Type: Article
Keywords: parity, violation spin, asymmetry quark, distribution function quark, polarization Brookhaven RHIC Coll STAR p p, inclusive reaction polarized beam, longitudinal W, hadroproduction W, leptonic decay lepton, transverse energy experimental results p p --> W anything W+ --> positron neutrino/e 500 GeV-cms
Date: February 2011
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2011) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-0982887-1006
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 05 Jun 2014 12:38
Last Modified: 24 Feb 2016 15:24
URI: http://digre.pmf.unizg.hr/id/eprint/2266

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