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Search for the production of a Higgs boson in association with a single top quark in pp collisions at √s = 13 TeV with the ATLAS detector

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A search for the production of a Higgs boson in association with a single top quark, tH, is presented. The analysis uses proton-proton collision data corresponding to an integrated luminosity of 140 fb−1 at a centre-of-mass energy of 13 TeV, collected by the ATLAS detector at the LHC. The search tar...

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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: October 10, 2025
In: Journal of high energy physics
Year: 2025, Heft: 10, Pages: 1-69
ISSN:1029-8479
DOI:10.1007/JHEP10(2025)093
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1007/JHEP10(2025)093
Verlag, kostenfrei, Volltext: https://link.springer.com/article/10.1007/JHEP10(2025)093
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Verfasserangaben:the ATLAS collaboration
Beschreibung
Zusammenfassung:A search for the production of a Higgs boson in association with a single top quark, tH, is presented. The analysis uses proton-proton collision data corresponding to an integrated luminosity of 140 fb−1 at a centre-of-mass energy of 13 TeV, collected by the ATLAS detector at the LHC. The search targets Higgs-boson decays into b¯b, WW*, ZZ*, and ττ, accompanied by an isolated lepton (electron or muon) from the top-quark decay. Multivariate techniques are employed to enhance the separation between signal and background processes. The observed signal strength, μtH, defined as the ratio between the measured cross-section and the predicted Standard Model value, is μtH = 8.1 ± 2.6 (stat.) ± 2.0 (syst.). The significance of the observed (expected) signal above the background-only expectation is 2.8 (0.4) standard deviations. The corresponding observed (expected) upper limit at the 95% confidence level on the tH cross-section is found to be 13.9 (6.1) times the value predicted by the Standard Model. An interpretation with an inverted sign of the top-quark Yukawa coupling is performed, and the signal strength and corresponding limit are reported.
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 2913
Gesehen am 23.04.2026
Beschreibung:Online Resource
ISSN:1029-8479
DOI:10.1007/JHEP10(2025)093

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