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Search for electroweak production of vector-like leptons τ-lepton and b-jet final states in pp collisions at √s = 13 TeV with the ATLAS detector

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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 (U 1) as predicted by an ultraviolet-complete extension of the SM, referred to as the ‘4321’ model. Given the assumed decay of U 1 into...

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Hauptverfasser: Aad, Georges (Verfasst von) , Ackermann, Anke (Verfasst von) , Backes, Mathias (Verfasst von) , Baltes, Lisa Marie (Verfasst von) , Bartels, Falk (Verfasst von) , Dittmeier, Sebastian (Verfasst von) , Dunford, Monica (Verfasst von) , Franchino, Silvia (Verfasst von) , Junkermann, Thomas (Verfasst von) , Mkrtchyan, Tigran (Verfasst von) , Nandi, Abhirikshma (Verfasst von) , Rassloff, Damir Fabrice (Verfasst von) , Sanfilippo, Lorenzo (Verfasst von) , Schöning, André (Verfasst von) , Schultz-Coulon, Hans-Christian (Verfasst von) , Sothilingam, Varsiha (Verfasst von) , Stamen, Rainer (Verfasst von) , Vigani, Luigi (Verfasst von) , Weber, Sebastian (Verfasst von) , Wessels, Martin (Verfasst von) , Zinßer, Joachim (Verfasst von)
Körperschaft: ATLAS Collaboration (Verfasst von)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 20 November 2025
In: The European physical journal. C, Particles and fields
Year: 2025, Jahrgang: 85, Heft: 11, Pages: 1-42
ISSN:1434-6052
DOI:10.1140/epjc/s10052-025-14748-z
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1140/epjc/s10052-025-14748-z
Verlag, kostenfrei, Volltext: https://link.springer.com/article/10.1140/epjc/s10052-025-14748-z
Volltext
Verfasserangaben:ATLAS Collaboration
Beschreibung
Zusammenfassung: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 (U 1) as predicted by an ultraviolet-complete extension of the SM, referred to as the ‘4321’ model. Given the assumed decay of U 1 into third-generation SM fermions, the final state can contain multiple $$\tau $$-leptons and b-quarks. This search is based on a dataset of pp collisions at √s=13 TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of up to 140 fb -1. 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).
Beschreibung:ATLAS Collaboration: G. Aad, A. Ackermann, M.J. Backes, L.M. Baltes, F. Bartels, S.J. Dittmeier, M. Dunford, S. Franchino, T. Junkermann, T. Mkrtchyan, A. Nandi, D.F. Rassloff, L. Sanfilippo, A. Schoening, H.-C. Schultz-Coulon, V. Sothilingam, R. Stamen, L. Vigani, S.M. Weber, M. Wessels, J. Zinsser und weitere 2893
Gesehen am 28.04.2026
Beschreibung:Online Resource
ISSN:1434-6052
DOI:10.1140/epjc/s10052-025-14748-z

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