Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV

The combination of measurements of the W boson polarization in top quark decays performed by the ATLAS and CMS collaborations is presented. The measurements are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 8 TeV, and corresponding to an integrated luminosit...

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Autores principales: Alonso, Francisco, Arduh, Francisco Anuar, Dova, María Teresa, Hoya, Joaquín, Monticelli, Fernando Gabriel, Orellana, Gonzalo Enrique, Wahlberg, Hernán Pablo, The ATLAS Collaboration; CMS Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2020
Materias:
Física
Hadron-Hadron scattering (experiments)
Top physics
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/124565
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-124565
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Hadron-Hadron scattering (experiments)
Top physics
spellingShingle Física
Hadron-Hadron scattering (experiments)
Top physics
Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Orellana, Gonzalo Enrique
Wahlberg, Hernán Pablo
The ATLAS Collaboration; CMS Collaboration
Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV
topic_facet Física
Hadron-Hadron scattering (experiments)
Top physics
description The combination of measurements of the W boson polarization in top quark decays performed by the ATLAS and CMS collaborations is presented. The measurements are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of about 20 fb−1 for each experiment. The measurements used events containing one lepton and having different jet multiplicities in the final state. The results are quoted as fractions of W bosons with longitudinal (F0 ), left-handed (FL), or right-handed (FR) polarizations. The resulting combined measurements of the polarization fractions are F0 = 0.693 ± 0.014 and FL = 0.315 ± 0.011. The fraction FR is calculated from the unitarity constraint to be FR = −0.008 ± 0.007. These results are in agreement with the standard model predictions at next-to-next-to-leading order in perturbative quantum chromodynamics and represent an improvement in precision of 25 (29)% for F0 (FL) with respect to the most precise single measurement. A limit on anomalous right-handed vector (VR), and left- and right-handed tensor (gL, gR) tWb couplings is set while fixing all others to their standard model values. The allowed regions are [−0.11, 0.16] for VR, [−0.08, 0.05] for gL, and [−0.04, 0.02] for gR, at 95% confidence level. Limits on the corresponding Wilson coefficients are also derived.
format Articulo
Articulo
author Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Orellana, Gonzalo Enrique
Wahlberg, Hernán Pablo
The ATLAS Collaboration; CMS Collaboration
author_facet Alonso, Francisco
Arduh, Francisco Anuar
Dova, María Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Orellana, Gonzalo Enrique
Wahlberg, Hernán Pablo
The ATLAS Collaboration; CMS Collaboration
author_sort Alonso, Francisco
title Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV
title_short Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV
title_full Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV
title_fullStr Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV
title_full_unstemmed Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV
title_sort combination of the w boson polarization measurements in top quark decays using atlas and cms data at √s = 8 tev
publishDate 2020
url http://sedici.unlp.edu.ar/handle/10915/124565
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