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

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Article number2001
<mark>Journal publication date</mark>05/2012
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number5
Volume72
Number of pages30
Publication StatusPublished
<mark>Original language</mark>English

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<pWT<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.

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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.