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Search for singly produced vectorlike top partners in multilepton final states with 139 fb-1 of pp collision data at โˆš๐‘  = 13 TeV with the ATLAS detector

A search for the single production of a vectorlike top partner (๐‘‡) with mass greater than 1 TeV decaying into a ๐‘ boson and a top quark is presented, using the full Run 2 dataset corresponding to 139 fbโˆ’1 of ๐‘โข๐‘ collisions at โˆš๐‘  =13 TeV, collected in 2015-2018 with the ATLAS detector at the Large Ha...

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Main Authors: Aad, Georges (Author) , Baltes, Lisa Marie (Author) , Bartels, Falk (Author) , Dittmeier, Sebastian (Author) , Dunford, Monica (Author) , Franchino, Silvia (Author) , Junkermann, Thomas (Author) , Klassen, Martin (Author) , Mkrtchyan, Tigran (Author) , Ott, Philipp (Author) , Rassloff, Damir Fabrice (Author) , Rodriguez Bosca, Sergi (Author) , Sauer, Christof (Author) , Schoฬˆning, Andreฬ (Author) , Schultz-Coulon, Hans-Christian (Author) , Sothilingam, Varsiha (Author) , Stamen, Rainer (Author) , Starovoitov, Pavel (Author) , Vigani, Luigi (Author) , Weber, Sebastian (Author) , Wessels, Martin (Author) , ZinรŸer, Joachim (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 11 June, 2024
In: Physical review
Year: 2024, Volume: 109, Issue: 11, Pages: 1-34
ISSN:2470-0029
DOI:10.1103/PhysRevD.109.112012
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevD.109.112012
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.109.112012
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Author Notes:G. Aad et al.* (ATLAS Collaboration)
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Summary:A search for the single production of a vectorlike top partner (๐‘‡) with mass greater than 1 TeV decaying into a ๐‘ boson and a top quark is presented, using the full Run 2 dataset corresponding to 139 fbโˆ’1 of ๐‘โข๐‘ collisions at โˆš๐‘  =13 TeV, collected in 2015-2018 with the ATLAS detector at the Large Hadron Collider. The targeted final state is characterized by the presence of a pair of electrons or muons with opposite-sign charges which form a ๐‘-boson candidate, as well as by the presence of ๐‘-tagged jets and forward jets. Events with exactly two or at least three leptons are categorized into two independently optimized analysis channels. No significant excess above the background expectation is observed and the results from the two channels are statistically combined to set exclusion limits at 95% confidence level on the masses and couplings of ๐‘‡. The results are interpreted in several benchmark scenarios to set limits on the mass and universal coupling strength (๐œ…) of the vectorlike quark. For singlet ๐‘‡ quarks, ๐œ… values between 0.22 and 0.64 are excluded for masses between 1000 and 1975 GeV. For ๐‘‡ quarks in the doublet scenario, where the production cross section is much lower, ๐œ… values between 0.54 and 0.88 are excluded for masses between 1000 and 1425 GeV.
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ATLAS Collaboration: G. Aad, L.M. Baltes, F. Bartels, S.J. Dittmeier, M. Dunford, S. Franchino, T. Junkermann, M. Klassen, T. Mkrtchyan, P.S. Ott, D.F. Rassloff, S. Rodriguez Bosca, C. Sauer, A. Schoening, H.-C. Schultz-Coulon, V. Sothilingam, R. Stamen, P. Starovoitov, L. Vigani, S.M. Weber, M. Wessels, J. Zinsser [und viele weitere]
Gesehen am 07.05.2025
Physical Description:Online Resource
ISSN:2470-0029
DOI:10.1103/PhysRevD.109.112012

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