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

Beck, H.P.; Chatterjee, M.; Ereditato, A.; Franconi, L.; Halser, L.; Haug, S.; Ilg, A.; Müller, R.; Möbius, Silke; O'Neill, A.P.; Schefer, M.M.; Weber, M.S. (2023). Search for third-generation vector-like leptons in pp collisions at √s = 13 TeV with the ATLAS detector. Journal of High Energy Physics, 2023(7) Springer 10.1007/JHEP07(2023)118

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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.

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