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Measurements of cross-sections for top-quark pair-production with the ATLAS detector

Comprehensive measurements of differential cross-sections of top-quark-antiquark pair-production are presented. The measurements are performed in the electron-muon, the lepton+jets and the all-hadronic channels. The latter two allow for reconstruction of the top-quark and top-quark-pair kinematic di...

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Autor principal: Khoo, Teng Jian
Lenguaje:eng
Publicado: 2020
Materias:
Acceso en línea:http://cds.cern.ch/record/2727457
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author Khoo, Teng Jian
author_facet Khoo, Teng Jian
author_sort Khoo, Teng Jian
collection CERN
description Comprehensive measurements of differential cross-sections of top-quark-antiquark pair-production are presented. The measurements are performed in the electron-muon, the lepton+jets and the all-hadronic channels. The latter two allow for reconstruction of the top-quark and top-quark-pair kinematic distributions. In the electron-muon channel, kinematic properties of the two leptons are measured differentially. High sensitivity of some distributions to PDFs is demonstrated. The lepton+jets and all-hadronic channels are complementary in terms of range and resolution for several top-quark variables. All three measurements use data recorded in the years 2015 and 2016 during Run 2 of the LHC. The measurements are compared quantitatively with predictions from several setups of next-to-leading order matrix-element generators combined with parton-shower generators and from fixd order calculations at NNLO in QCD. In addition, the total cross-section is measured in the electron-muon channel. A precision of 2.4% is reached, well below the uncertainty of predictions at next-to-next-to-leading order in QCD. The total cross-section is compared to predictions by different sets of parton distribution functions and is used to determine the top-quark mass. A total cross-section measurement based on the full Run 2 dataset in the lepton+jets channel is also presented.
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institution Organización Europea para la Investigación Nuclear
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spelling cern-27274572020-08-07T22:07:38Zhttp://cds.cern.ch/record/2727457engKhoo, Teng JianMeasurements of cross-sections for top-quark pair-production with the ATLAS detectorParticle Physics - ExperimentComprehensive measurements of differential cross-sections of top-quark-antiquark pair-production are presented. The measurements are performed in the electron-muon, the lepton+jets and the all-hadronic channels. The latter two allow for reconstruction of the top-quark and top-quark-pair kinematic distributions. In the electron-muon channel, kinematic properties of the two leptons are measured differentially. High sensitivity of some distributions to PDFs is demonstrated. The lepton+jets and all-hadronic channels are complementary in terms of range and resolution for several top-quark variables. All three measurements use data recorded in the years 2015 and 2016 during Run 2 of the LHC. The measurements are compared quantitatively with predictions from several setups of next-to-leading order matrix-element generators combined with parton-shower generators and from fixd order calculations at NNLO in QCD. In addition, the total cross-section is measured in the electron-muon channel. A precision of 2.4% is reached, well below the uncertainty of predictions at next-to-next-to-leading order in QCD. The total cross-section is compared to predictions by different sets of parton distribution functions and is used to determine the top-quark mass. A total cross-section measurement based on the full Run 2 dataset in the lepton+jets channel is also presented.ATL-PHYS-SLIDE-2020-266oai:cds.cern.ch:27274572020-08-07
spellingShingle Particle Physics - Experiment
Khoo, Teng Jian
Measurements of cross-sections for top-quark pair-production with the ATLAS detector
title Measurements of cross-sections for top-quark pair-production with the ATLAS detector
title_full Measurements of cross-sections for top-quark pair-production with the ATLAS detector
title_fullStr Measurements of cross-sections for top-quark pair-production with the ATLAS detector
title_full_unstemmed Measurements of cross-sections for top-quark pair-production with the ATLAS detector
title_short Measurements of cross-sections for top-quark pair-production with the ATLAS detector
title_sort measurements of cross-sections for top-quark pair-production with the atlas detector
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2727457
work_keys_str_mv AT khootengjian measurementsofcrosssectionsfortopquarkpairproductionwiththeatlasdetector