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Combination of searches for singly produced vectorlike top quarks in 𝑝⁒𝑝 collisions at βˆšπ‘  =13  TeV with the ATLAS detector

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Article number012012
<mark>Journal publication date</mark>29/01/2025
<mark>Journal</mark>Physical Review D
Issue number1
Volume111
Publication StatusPublished
<mark>Original language</mark>English

Abstract

A combination of searches for the single production of vectorlike top quarks (𝑇) is presented. These analyses are based on proton-proton collisions at βˆšπ‘  =13  TeV recorded in 2015–2018 with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 139  fbβˆ’1. The 𝑇 decay modes considered in this combination are into a top quark and either a Standard Model Higgs boson or a 𝑍 boson (𝑇 →𝐻⁑𝑑 and 𝑇→𝑍⁒𝑑). The individual searches used in the combination are differentiated by the number of leptons (𝑒, π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, πœ…, of 0.5, masses below 2.1 TeV are excluded, resulting in the most restrictive limits to date.