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Search for charged lepton-flavour violation in top-quark decays at the LHC with the ATLAS detector

A direct search for charged lepton-flavour violation in top-quark decays is presented. The data analysed correspond to 79.8 $\text{fb}^{-1}$ of proton-proton collisions at a centre-of-mass energy of $\sqrt{s}= 13$ TeV delivered by the LHC. The process studied is the production of top-quark pairs, wh...

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Autor principal: The ATLAS collaboration
Lenguaje:eng
Publicado: 2018
Materias:
Acceso en línea:http://cds.cern.ch/record/2638305
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author The ATLAS collaboration
author_facet The ATLAS collaboration
author_sort The ATLAS collaboration
collection CERN
description A direct search for charged lepton-flavour violation in top-quark decays is presented. The data analysed correspond to 79.8 $\text{fb}^{-1}$ of proton-proton collisions at a centre-of-mass energy of $\sqrt{s}= 13$ TeV delivered by the LHC. The process studied is the production of top-quark pairs, where one top quark decays into a pair of opposite-sign different-flavour charged leptons and an up-type quark, while the other decays semileptonically according to the Standard Model. The signature of the signal is thus characterised by the presence of three charged leptons, a light jet and a $b$-jet. A multivariate discriminant is deployed and its distribution used as input to extract the signal strength. In the absence of a signal, an upper limit on the branching ratio of ${\cal B}(t \to \ell \ell' q) < 1.86 \times 10^{-5}$ is set at 95% confidence level.
id cern-2638305
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2018
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spelling cern-26383052021-04-18T19:39:21Zhttp://cds.cern.ch/record/2638305engThe ATLAS collaborationSearch for charged lepton-flavour violation in top-quark decays at the LHC with the ATLAS detectorParticle Physics - ExperimentA direct search for charged lepton-flavour violation in top-quark decays is presented. The data analysed correspond to 79.8 $\text{fb}^{-1}$ of proton-proton collisions at a centre-of-mass energy of $\sqrt{s}= 13$ TeV delivered by the LHC. The process studied is the production of top-quark pairs, where one top quark decays into a pair of opposite-sign different-flavour charged leptons and an up-type quark, while the other decays semileptonically according to the Standard Model. The signature of the signal is thus characterised by the presence of three charged leptons, a light jet and a $b$-jet. A multivariate discriminant is deployed and its distribution used as input to extract the signal strength. In the absence of a signal, an upper limit on the branching ratio of ${\cal B}(t \to \ell \ell' q) < 1.86 \times 10^{-5}$ is set at 95% confidence level.ATLAS-CONF-2018-044oai:cds.cern.ch:26383052018-09-13
spellingShingle Particle Physics - Experiment
The ATLAS collaboration
Search for charged lepton-flavour violation in top-quark decays at the LHC with the ATLAS detector
title Search for charged lepton-flavour violation in top-quark decays at the LHC with the ATLAS detector
title_full Search for charged lepton-flavour violation in top-quark decays at the LHC with the ATLAS detector
title_fullStr Search for charged lepton-flavour violation in top-quark decays at the LHC with the ATLAS detector
title_full_unstemmed Search for charged lepton-flavour violation in top-quark decays at the LHC with the ATLAS detector
title_short Search for charged lepton-flavour violation in top-quark decays at the LHC with the ATLAS detector
title_sort search for charged lepton-flavour violation in top-quark decays at the lhc with the atlas detector
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2638305
work_keys_str_mv AT theatlascollaboration searchforchargedleptonflavourviolationintopquarkdecaysatthelhcwiththeatlasdetector