Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at s = √7 TeV with the ATLAS experiment
Name
Measurement of the polarisation.pdf
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2.42 MB
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Adobe PDF
Checksum (MD5)
624d9fbafee6fcb5cd40ceb4fb630789
Author(s)
Taylor, Frank E
Date Issued
May 2012
Journal
The European Physical Journal C
Publisher
Springer-Verlag
Citation
The ATLAS Collaboration et al. “Measurement of the Polarisation of W Bosons Produced with Large Transverse Momentum in Pp Collisions at √s = 7 TeV with the ATLAS Experiment.” The European Physical Journal C 72.5 (2012): n. pag. © 2012 CERN for the benefit of the ATLAS collaboration
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 s√=7 TeV recorded with the ATLAS detector at the LHC in 2010, corresponding to an integrated luminosity of about 35 pb[superscript −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[subscript 0], f[subscript L] and f[subscript R] over two ranges of W transverse momentum (p[superscript W][subscript T]) : 35 < p[superscript W][subscript T] < 50 GeV and p[superscript W][subscript T] > 50 GeV. Good agreement is found with theoretical predictions. For p[superscript W][subscript T] > 50 GeV, the values of f[subscript 0] and f[subscript L]−f[subscript R], averaged over charge and lepton flavour, are measured to be: f[subscript 0]=0.127±0.030±0.108 and f[subscript L]−f[subscript 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
Terms of Use
Creative Commons Attribution 4.0 International License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1140/epjc/s10052-012-2001-6
