Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at s = √7 TeV with the ATLAS experiment
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 a...
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| Format: | Article |
| Language: | en_US |
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Springer-Verlag
2017
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| Online Access: | http://hdl.handle.net/1721.1/106211 https://orcid.org/0000-0002-7586-7253 |
| Summary: | 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. |
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