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...
Guardado en:
Autores principales: | , , , , , , , |
---|---|
Formato: | Articulo |
Lenguaje: | Inglés |
Publicado: |
2020
|
Materias: | |
Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/124565 |
Aporte de: |
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 |
work_keys_str_mv |
AT alonsofrancisco combinationofthewbosonpolarizationmeasurementsintopquarkdecaysusingatlasandcmsdataats8tev AT arduhfranciscoanuar combinationofthewbosonpolarizationmeasurementsintopquarkdecaysusingatlasandcmsdataats8tev AT dovamariateresa combinationofthewbosonpolarizationmeasurementsintopquarkdecaysusingatlasandcmsdataats8tev AT hoyajoaquin combinationofthewbosonpolarizationmeasurementsintopquarkdecaysusingatlasandcmsdataats8tev AT monticellifernandogabriel combinationofthewbosonpolarizationmeasurementsintopquarkdecaysusingatlasandcmsdataats8tev AT orellanagonzaloenrique combinationofthewbosonpolarizationmeasurementsintopquarkdecaysusingatlasandcmsdataats8tev AT wahlberghernanpablo combinationofthewbosonpolarizationmeasurementsintopquarkdecaysusingatlasandcmsdataats8tev AT theatlascollaborationcmscollaboration combinationofthewbosonpolarizationmeasurementsintopquarkdecaysusingatlasandcmsdataats8tev |
bdutipo_str |
Repositorios |
_version_ |
1764820450642231296 |