Search for electroweak production of vector-like leptons in Ƭ-lepton and b-jet final states in pp collisions at √s =13 TeV with the ATLAS detector
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2025
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Aad, G.
Aakvaag, E.
Abbott, B.
Abdelhameed, S.
Abeling, K.
Abicht, N.J.
Abidi, S.H.
Aboelela, M.
Aboulhorma, A.
Abramowicz, H.
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European Physical Journal C, 2025; 85(11):1335-1-1335-42
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A search for pair-production of vector-like leptons is presented, considering their decays into a third-generation Standard Model (SM) quark and a vector leptoquark () as predicted by an ultraviolet-complete extension of the SM, referred to as the ‘4321’ model. Given the assumed decay of into third-generation SM fermions, the final state can contain multiple -leptons and b-quarks. This search is based on a dataset of pp collisions at TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of up to . No significant excess above the SM background prediction is observed, and 95% confidence level limits on the cross-section times branching ratio are derived as a function of the vector-like lepton mass. A lower observed (expected) limit of 910 GeV (970 GeV) is set on the vector-like lepton mass. Additionally, the results are interpreted for a supersymmetric model with an R-parity violating coupling to the third-generation quarks and leptons. Lower observed (expected) limits are obtained on the higgsino mass at 880 GeV (940 GeV) and on the wino mass at 1170 GeV (1170 GeV).
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© CERN for the benefit of the ATLAS Collaboration 2025. This article is licensed under a Creative Commons Attribution 4.0 International License