Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at √𝑠 = 7 with the ATLAS experiment TeV
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10052_2012_Article_2001.pdf
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Author(s)
Aad, G.
Abbott, B.
Abdallah, J.
Abdelalim, A. A.
Abdesselam, A.
Abdinov, O.
Abi, B.
Abolins, M.
AbouZeid, O. S.
Abramowicz, H.
Date Issued
May 8, 2012
Publisher
Springer Berlin Heidelberg
Citation
The European Physical Journal C. 2012 May 08;72(5):2001
Version
Final published version
Abstract
This paper describes an analysis of the angular distribution of W→eν and W→μν decays, using data from pp collisions at
$\sqrt{s} = 7\ \mbox{TeV}$
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
$(p_{\mathrm{T}}^{W} ): 35 < p_{\mathrm{T}}^{W}< 50\ \mbox{GeV}$
and
$p_{\mathrm{T}}^{W}> 50\ \mbox{GeV}$
. Good agreement is found with theoretical predictions. For
$p_{\mathrm{T}}^{W}> 50\ \mbox{GeV}$
, 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-012-2001-6
