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 -1 . Using the decay lepton transverse momentum and the missi...

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Publicado: 2012
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14346044_v72_n5_p1_Aad
http://hdl.handle.net/20.500.12110/paper_14346044_v72_n5_p1_Aad
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_14346044_v72_n5_p1_Aad
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spelling paper:paper_14346044_v72_n5_p1_Aad2023-06-08T16:14:49Z 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 -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 W T ): 35 < p W T < 50 GeV and p W T > 50 GeV. Good agreement is found with theoretical predictions. For p W T >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. © 2012 CERN for the benefit of the ATLAS collaboration. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14346044_v72_n5_p1_Aad http://hdl.handle.net/20.500.12110/paper_14346044_v72_n5_p1_Aad
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description 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 (p W T ): 35 < p W T < 50 GeV and p W T > 50 GeV. Good agreement is found with theoretical predictions. For p W T >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. © 2012 CERN for the benefit of the ATLAS collaboration.
title Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at √s =7 TeV with the ATLAS experiment
spellingShingle Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at √s =7 TeV with the ATLAS experiment
title_short Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at √s =7 TeV with the ATLAS experiment
title_full Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at √s =7 TeV with the ATLAS experiment
title_fullStr Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at √s =7 TeV with the ATLAS experiment
title_full_unstemmed Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at √s =7 TeV with the ATLAS experiment
title_sort measurement of the polarisation of w bosons produced with large transverse momentum in pp collisions at √s =7 tev with the atlas experiment
publishDate 2012
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14346044_v72_n5_p1_Aad
http://hdl.handle.net/20.500.12110/paper_14346044_v72_n5_p1_Aad
_version_ 1768546458661814272

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