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Search for resonant leptoquark production via lepton-jet signatures in pp collisions at √s = 13 TeV and √ s= 13.6 TeV with the ATLAS detector

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This paper presents a search for physics beyond the Standard Model targeting a heavy resonance visible in the invariant mass of the lepton-jet system. The analysis focuses on final states with a high-energy lepton and jet, and is optimised for the resonant production of leptoquarks — a novel product...

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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) , 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: December 23, 2025
In: Journal of high energy physics
Year: 2025, Heft: 12, Pages: 1-59
ISSN:1029-8479
DOI:10.1007/JHEP12(2025)180
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1007/JHEP12(2025)180
Verlag, kostenfrei, Volltext: https://link.springer.com/article/10.1007/JHEP12(2025)180
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Verfasserangaben:the ATLAS collaboration
Beschreibung
Zusammenfassung:This paper presents a search for physics beyond the Standard Model targeting a heavy resonance visible in the invariant mass of the lepton-jet system. The analysis focuses on final states with a high-energy lepton and jet, and is optimised for the resonant production of leptoquarks — a novel production mode mediated by the lepton content of the proton originating from quantum fluctuations. Four distinct and orthogonal final states are considered: e+light jet, μ+light jet, e+b-jet, and μ+b-jet, constituting the first search at the Large Hadron Collider for resonantly produced leptoquarks with couplings to electrons and muons. Events with an additional same-flavour lepton, as expected from higher-order diagrams in the signal process, are also included in each channel. The search uses proton-proton collision data from the full Run 2, corresponding to an integrated luminosity of 140 fb−1 at a centre-of-mass energy of √s=13 TeV, and from a part of Run 3 (2022-2023), corresponding to 55 fb−1 at √s=13.6 TeV. No significant excess over Standard Model predictions is observed. The results are interpreted as exclusion limits on scalar leptoquark (S̃1) production, substantially improving upon previous ATLAS constraints from leptoquark pair production for large coupling values. The excluded S̃1 mass ranges depend on the coupling strength, reaching up to 3.4 TeV for quark-lepton couplings yde = 1.0, and up to 4.3 TeV, 3.1 TeV, and 2.8 TeV for ysμ, ybe, and ybμ couplings set to 3.5, respectively.
Beschreibung:ATLAS Collaboration: G. Aad, A. Ackermann, M.J. Backes, L.M. Baltes, F. Bartels, S.J. Dittmeier, M. Dunford, S. Franchino, T. Junkermann, 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 2915
Gesehen am 27.04.2026
Beschreibung:Online Resource
ISSN:1029-8479
DOI:10.1007/JHEP12(2025)180

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