A combination of searches for the single production of vectorlike top quarks (๐‘‡) is presented. These analyses are based on proton-proton collisions at โˆš๐‘  =13โ€‰โ€‰TeV recorded in 2015โ€“2018 with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 139โ€‰โ€‰fbโˆ’1. The ๐‘‡ decay modes considered in this combination are into a top quark and either a Standard Model Higgs boson or a ๐‘ boson (๐‘‡ โ†’๐ปโก๐‘ก and ๐‘‡โ†’๐‘โข๐‘ก). The individual searches used in the combination are differentiated by the number of leptons (๐‘’, ๐œ‡) in the final state. The observed data are found to be in good agreement with the Standard Model background prediction. Interpretations are provided for a range of masses and couplings of the vectorlike top quark for benchmark models and generalized representations in terms of 95% confidence level limits. For a benchmark signal prediction of a vectorlike top quark SU(2) singlet with electroweak coupling, ๐œ…, of 0.5, masses below 2.1 TeV are excluded, resulting in the most restrictive limits to date.

Combination of searches for singly produced vectorlike top quarks in ๐‘โข๐‘ collisions at โˆš๐‘  =13โ€‰โ€‰TeV with the ATLAS detector

Cristoforetti, M.;Di Luca, A.;
2025-01-01

Abstract

A combination of searches for the single production of vectorlike top quarks (๐‘‡) is presented. These analyses are based on proton-proton collisions at โˆš๐‘  =13โ€‰โ€‰TeV recorded in 2015โ€“2018 with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 139โ€‰โ€‰fbโˆ’1. The ๐‘‡ decay modes considered in this combination are into a top quark and either a Standard Model Higgs boson or a ๐‘ boson (๐‘‡ โ†’๐ปโก๐‘ก and ๐‘‡โ†’๐‘โข๐‘ก). The individual searches used in the combination are differentiated by the number of leptons (๐‘’, ๐œ‡) in the final state. The observed data are found to be in good agreement with the Standard Model background prediction. Interpretations are provided for a range of masses and couplings of the vectorlike top quark for benchmark models and generalized representations in terms of 95% confidence level limits. For a benchmark signal prediction of a vectorlike top quark SU(2) singlet with electroweak coupling, ๐œ…, of 0.5, masses below 2.1 TeV are excluded, resulting in the most restrictive limits to date.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11582/358522
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