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Search for single production of vector-like quarks decaying into W(ℓν)b in pp collisions at √s=13 TeV with the ATLAS detector

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A search for single production of a vector-like quark Q, which could be either a singlet T, with charge 2/3, or a Y from a (T, B, Y) triplet, with charge -4/3, is performed using data from proton-proton collisions at a centre-of-mass energy of 13 TeV. The data correspond to the full integrated lumin...

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Main Authors: Aad, Georges (Author) , Ackermann, Anke (Author) , Backes, Mathias (Author) , Baltes, Lisa Marie (Author) , Bartels, Falk (Author) , Dittmeier, Sebastian (Author) , Dunford, Monica (Author) , Franchino, Silvia (Author) , Junkermann, Thomas (Author) , Mkrtchyan, Tigran (Author) , Nandi, Abhirikshma (Author) , Rassloff, Damir Fabrice (Author) , Sanfilippo, Lorenzo (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Sothilingam, Varsiha (Author) , Stamen, Rainer (Author) , Vigani, Luigi (Author) , Weber, Sebastian (Author) , Wessels, Martin (Author) , Zinßer, Joachim (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: December 1, 2026
In: Journal of high energy physics
Year: 2025, Issue: 12, Pages: 1-55
ISSN:1029-8479
DOI:10.1007/JHEP12(2025)012
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1007/JHEP12(2025)012
Verlag, kostenfrei, Volltext: https://link.springer.com/article/10.1007/JHEP12(2025)012
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Author Notes:The ATLAS collaboration
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Summary:A search for single production of a vector-like quark Q, which could be either a singlet T, with charge 2/3, or a Y from a (T, B, Y) triplet, with charge -4/3, is performed using data from proton-proton collisions at a centre-of-mass energy of 13 TeV. The data correspond to the full integrated luminosity of 140 fb−1 recorded with the ATLAS detector during Run 2 of the Large Hadron Collider. The analysis targets Q → Wb decays where the W boson decays leptonically. The data are found to be consistent with the expected Standard Model background, so upper limits are set on the cross-section times branching ratio, and on the coupling of the Q to the Standard Model sector for these two benchmark models. Effects of interference with the Standard Model background are taken into account. For the singlet T, the 95% confidence level limit on the coupling strength κ ranges between 0.22 and 0.52 for masses from 1150 to 2300 GeV. For the (T, B, Y) triplet, the limits on κ vary from 0.14 to 0.46 for masses from 1150 to 2600 GeV.
Item Description: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 27.04.2026
Physical Description:Online Resource
ISSN:1029-8479
DOI:10.1007/JHEP12(2025)012

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