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Precision W and Z Measurements at ATLAS

Precision measurements of the production cross-sections of W/Z boson at LHC provide important tests of perturbative QCD, information about the parton distribution functions for quarks within the proton and fundamental parameters of the Standard Model. Extremely precise double-differential measuremen...

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Autor principal: Beauchemin, Pierre-Hugues
Lenguaje:eng
Publicado: 2023
Materias:
Acceso en línea:http://cds.cern.ch/record/2860809
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author Beauchemin, Pierre-Hugues
author_facet Beauchemin, Pierre-Hugues
author_sort Beauchemin, Pierre-Hugues
collection CERN
description Precision measurements of the production cross-sections of W/Z boson at LHC provide important tests of perturbative QCD, information about the parton distribution functions for quarks within the proton and fundamental parameters of the Standard Model. Extremely precise double-differential measurement of Z transverse momentum and rapidity at centre-of-mass energy of 8 TeV will be presented. This measurement is used to extract the coupling constant of the strong interactions using state-of-the-art predictions at third-order accuracy in perturbative QCD, supplemented by resummation of logarithmically-enhanced contributions in the small transverse-momentum region of the lepton pairs. In addition, the W mass is determined with a profile-likelihood fit technique which allows improvements in the precision of the mass determination by fully exploiting the information present in the 7 TeV proton-proton data. Finally, the measurement of the W, Z, ttbar cross section and their ratios at the centre-of-mass energy of 13.6 TeV using early Run3 data will be shown.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2023
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spelling cern-28608092023-06-05T19:47:12Zhttp://cds.cern.ch/record/2860809engBeauchemin, Pierre-HuguesPrecision W and Z Measurements at ATLASParticle Physics - ExperimentPrecision measurements of the production cross-sections of W/Z boson at LHC provide important tests of perturbative QCD, information about the parton distribution functions for quarks within the proton and fundamental parameters of the Standard Model. Extremely precise double-differential measurement of Z transverse momentum and rapidity at centre-of-mass energy of 8 TeV will be presented. This measurement is used to extract the coupling constant of the strong interactions using state-of-the-art predictions at third-order accuracy in perturbative QCD, supplemented by resummation of logarithmically-enhanced contributions in the small transverse-momentum region of the lepton pairs. In addition, the W mass is determined with a profile-likelihood fit technique which allows improvements in the precision of the mass determination by fully exploiting the information present in the 7 TeV proton-proton data. Finally, the measurement of the W, Z, ttbar cross section and their ratios at the centre-of-mass energy of 13.6 TeV using early Run3 data will be shown.ATL-PHYS-SLIDE-2023-211oai:cds.cern.ch:28608092023-06-05
spellingShingle Particle Physics - Experiment
Beauchemin, Pierre-Hugues
Precision W and Z Measurements at ATLAS
title Precision W and Z Measurements at ATLAS
title_full Precision W and Z Measurements at ATLAS
title_fullStr Precision W and Z Measurements at ATLAS
title_full_unstemmed Precision W and Z Measurements at ATLAS
title_short Precision W and Z Measurements at ATLAS
title_sort precision w and z measurements at atlas
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2860809
work_keys_str_mv AT beaucheminpierrehugues precisionwandzmeasurementsatatlas