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Search for third-generation vector-like leptons in pp collisions at √s = 13 TeV with the ATLAS detector

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  • The ATLAS collaboration
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Article number118
<mark>Journal publication date</mark>13/07/2023
<mark>Journal</mark>Journal of High Energy Physics
Issue number7
Volume2023
Publication StatusPublished
<mark>Original language</mark>English

Abstract

A search for vector-like leptons in multilepton (two, three, or four-or-more electrons plus muons) final states with zero or more hadronic τ-lepton decays is presented. The search is performed using a dataset corresponding to an integrated luminosity of 139 fb−1 of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded by the ATLAS detector at the LHC. To maximize the separation of signal and background, a machine-learning classifier is used. No excess of events is observed beyond the Standard Model expectation. Using a doublet vector-like lepton model, vector-like leptons coupling to third-generation Standard Model leptons are excluded in the mass range from 130 GeV to 900 GeV at the 95% confidence level, while the highest excluded mass is expected to be 970 GeV.