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Type: Journal article
Title: Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at √s =7 TeV with the ATLAS experiment
Other Titles: Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at root s =7 TeV with the ATLAS experiment
Author: Aad, G.
ATLAS Collaboration
Citation: The European Physical Journal C, 2012; 72(5):2001-1-2001-30
Publisher: Springer
Issue Date: 2012
ISSN: 1434-6044
Statement of
G. Aad ... P. Jackson ... L. Lee ... A. Petridis ... N. Soni ... M.J. White ... et al. (ATLAS Collaboration)
Abstract: This paper describes an analysis of the angular distribution of W → eν and W → μν decays, using data from pp collisions at √s = 7 TeV recorded with the ATLAS detector at the LHC in 2010, corresponding to an integrated luminosity of about 35 pb⁻¹. Using the decay lepton transverse momentum and the missing transverse momentum, the W decay angular distribution projected onto the transverse plane is obtained and analysed in terms of helicity fractions f0, fL and fR over two ranges of W transverse momentum (pW T ) : 35<pW T < 50 GeV and pW T > 50 GeV. Good agreement is found with theoretical predictions. For pW T > 50 GeV, the values of f0 and fL − fR, averaged over charge and lepton flavour, are measured to be: f0 = 0.127±0.030±0.108 and fL−fR = 0.252±0.017±0.030, where the first uncertainties are statistical, and the second include all systematic effects.
Rights: © CERN for the benefit of the ATLAS collaboration 2012. This article is published with open access at This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.
RMID: 0030020253
DOI: 10.1140/epjc/s10052-012-2001-6
Appears in Collections:Chemistry and Physics publications

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