A combination of searches for the single production of vectorlike top quarks (𝑇) is presented. These analyses are based on proton-proton collisions at √s=13  TeV recorded in 2015–2018 with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 139  fb−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⁡𝑡 and 𝑇→𝑍⁢𝑡). The individual searches used in the combination are differentiated by the number of leptons (𝑒, 𝜇) 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, 𝜅, 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 pp collisions at √s=13  TeV with the ATLAS detector / G. Aad, E.A.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 111:1(2025 Jan 29), pp. 012012.1-012012.30. [10.1103/physrevd.111.012012]

Combination of searches for singly produced vectorlike top quarks in pp collisions at √s=13  TeV with the ATLAS detector

A. Andreazza;A. Carbone;L. Carminati;S. D'Auria;L. Dell'Asta;M. Fanti;M. Lazzaroni;E. Mazzeo;C. Meroni;L. Nasella;F. Ragusa;A. Sala;
2025

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 √s=13  TeV recorded in 2015–2018 with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 139  fb−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⁡𝑡 and 𝑇→𝑍⁢𝑡). The individual searches used in the combination are differentiated by the number of leptons (𝑒, 𝜇) 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, 𝜅, of 0.5, masses below 2.1 TeV are excluded, resulting in the most restrictive limits to date.
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
Settore IMIS-01/B - Misure elettriche ed elettroniche
29-gen-2025
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.111.012012
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1140737
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