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Scientific article
English

Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at √s=7 TeV with the ATLAS experiment

ContributorsATLAS Collaboration
Published inEuropean physical journal. C, Particles and fields, vol. 72, no. 2001, 30
Publication date2012
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 f 0, f L and f R over two ranges of W transverse momentum (pWT):35<50 GeV and pWT>50 GeV . Good agreement is found with theoretical predictions. For pWT>50 GeV , the values of f 0 and f L−f R, averaged over charge and lepton flavour, are measured to be: f 0=0.127±0.030±0.108 and f L−f R=0.252±0.017±0.030, where the first uncertainties are statistical, and the second include all systematic effects.

Citation (ISO format)
ATLAS Collaboration. Measurement of the polarisation of <em>W</em> bosons produced with large transverse momentum in <em>pp</em> collisions at √s=7 TeV with the ATLAS experiment. In: European physical journal. C, Particles and fields, 2012, vol. 72, n° 2001, p. 30. doi: 10.1140/epjc/s10052-012-2001-6
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ISSN of the journal1434-6044
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