Measurement of the $t\bar{t}t\bar{t}$ quark production in 13 TeV pp collisions with the ATLAS experiment

A measurement of four-top-quark production using 139 fb$^{-1}$ of proton-proton collision data at a center-of-mass energy of 13 TeV collected by the ATLAS detector at the Large Hadron Collider. Events are selected if they contain a single lepton (electron or muon) or an opposite-sign lepton pair, in...

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Autor principal: Sonay, Anil
Lenguaje:eng
Publicado: 2021
Materias:
Acceso en línea:http://cds.cern.ch/record/2775087
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author Sonay, Anil
author_facet Sonay, Anil
author_sort Sonay, Anil
collection CERN
description A measurement of four-top-quark production using 139 fb$^{-1}$ of proton-proton collision data at a center-of-mass energy of 13 TeV collected by the ATLAS detector at the Large Hadron Collider. Events are selected if they contain a single lepton (electron or muon) or an opposite-sign lepton pair, in association with multiple jets. The events are categorized according to the number of jets and how likely these are to contain b-hadrons. A multivariate technique is then used to discriminate between signal and background events. The measured four-top-quark production cross-section is $26^{+17}_{-15}$ fb, with a corresponding observed (expected) significance of 1.9 (1.0) standard deviations over the background-only hypothesis. The result is combined with the previous measurement performed by the ATLAS Collaboration in the multilepton final state. The combined four top-quark production cross-section is measured to be $24^{+7}_{-6}$ fb, with a corresponding observed (expected) signal significance of 4.7 (2.6) standard deviations over the background-only hypothesis. It is consistent within 2.0 standard deviations with the Standard Model prediction of 12.0 $\pm$ 2.4 fb.
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publishDate 2021
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spelling cern-27750872021-07-07T21:01:04Zhttp://cds.cern.ch/record/2775087engSonay, AnilMeasurement of the $t\bar{t}t\bar{t}$ quark production in 13 TeV pp collisions with the ATLAS experimentParticle Physics - ExperimentA measurement of four-top-quark production using 139 fb$^{-1}$ of proton-proton collision data at a center-of-mass energy of 13 TeV collected by the ATLAS detector at the Large Hadron Collider. Events are selected if they contain a single lepton (electron or muon) or an opposite-sign lepton pair, in association with multiple jets. The events are categorized according to the number of jets and how likely these are to contain b-hadrons. A multivariate technique is then used to discriminate between signal and background events. The measured four-top-quark production cross-section is $26^{+17}_{-15}$ fb, with a corresponding observed (expected) significance of 1.9 (1.0) standard deviations over the background-only hypothesis. The result is combined with the previous measurement performed by the ATLAS Collaboration in the multilepton final state. The combined four top-quark production cross-section is measured to be $24^{+7}_{-6}$ fb, with a corresponding observed (expected) signal significance of 4.7 (2.6) standard deviations over the background-only hypothesis. It is consistent within 2.0 standard deviations with the Standard Model prediction of 12.0 $\pm$ 2.4 fb.ATL-PHYS-PROC-2021-037oai:cds.cern.ch:27750872021-07-07
spellingShingle Particle Physics - Experiment
Sonay, Anil
Measurement of the $t\bar{t}t\bar{t}$ quark production in 13 TeV pp collisions with the ATLAS experiment
title Measurement of the $t\bar{t}t\bar{t}$ quark production in 13 TeV pp collisions with the ATLAS experiment
title_full Measurement of the $t\bar{t}t\bar{t}$ quark production in 13 TeV pp collisions with the ATLAS experiment
title_fullStr Measurement of the $t\bar{t}t\bar{t}$ quark production in 13 TeV pp collisions with the ATLAS experiment
title_full_unstemmed Measurement of the $t\bar{t}t\bar{t}$ quark production in 13 TeV pp collisions with the ATLAS experiment
title_short Measurement of the $t\bar{t}t\bar{t}$ quark production in 13 TeV pp collisions with the ATLAS experiment
title_sort measurement of the $t\bar{t}t\bar{t}$ quark production in 13 tev pp collisions with the atlas experiment
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2775087
work_keys_str_mv AT sonayanil measurementofthetbarttbartquarkproductionin13tevppcollisionswiththeatlasexperiment