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QCD corrections to longitudinal spin asymmetries in W±-boson production at RHIC


von Arx, C; Gehrmann, T (2011). QCD corrections to longitudinal spin asymmetries in W±-boson production at RHIC. Physics Letters B, 700(1):49-54.

Abstract

The polarized antiquark distributions in the proton can be measured by studying spin asymmetries in vector boson production in longitudinally polarized proton–proton collisions. The STAR and PHENIX experiments at BNL RHIC have reported first observations of single spin asymmetries in W± production most recently. We compute the QCD corrections to single and double spin asymmetries, taking account of the leptonic decay of the W± boson and of restrictions on the kinematical acceptance of the detectors. The QCD corrections have only a small impact on the asymmetries, such that a reliable extraction of the polarized antiquark distributions can be envisaged once more precise measurements are made.

Abstract

The polarized antiquark distributions in the proton can be measured by studying spin asymmetries in vector boson production in longitudinally polarized proton–proton collisions. The STAR and PHENIX experiments at BNL RHIC have reported first observations of single spin asymmetries in W± production most recently. We compute the QCD corrections to single and double spin asymmetries, taking account of the leptonic decay of the W± boson and of restrictions on the kinematical acceptance of the detectors. The QCD corrections have only a small impact on the asymmetries, such that a reliable extraction of the polarized antiquark distributions can be envisaged once more precise measurements are made.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:May 2011
Deposited On:19 Feb 2012 17:27
Last Modified:18 Aug 2018 00:08
Publisher:Elsevier
ISSN:0370-2693 (P) 1873-2445 (E)
OA Status:Gold
Publisher DOI:https://doi.org/10.1016/j.physletb.2011.04.062
Related URLs:http://arxiv.org/abs/1103.1465
Project Information:
  • : FunderSNSF
  • : Grant ID200020-122287
  • : Project TitleAstrophysical Processes, their simulation and related nuclear physics issues

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Download PDF  'QCD corrections to longitudinal spin asymmetries in W±-boson production at RHIC'.
Preview
Content: Accepted Version
Filetype: PDF (Version 1)
Size: 133kB