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Search for single production of vector-likeTquarks decaying intoHtorZtinppcollisions at√s̅=13TeV with the ATLAS detector
期刊文章

Search for single production of vector-likeTquarks decaying intoHtorZtinppcollisions at√s̅=13TeV with the ATLAS detector

Georges Aad, Braden Keim Abbott, Kira Abeling, Haider Abidi, Asmaa Aboulhorma, Halina Abramowicz, Henso Abreu, Yiming Abulaiti, Angel Abusleme, Bobby Samir Acharya, …
JHEP, 卷.8(8)
2023
DOI: https://doi.org/10.1007/JHEP08(2023)153
Web of Science ID: WOS:001062421100001

摘要

High Energy Physics - Experiment Physics
This paper describes a search for the single production of an up-type vector-like quark ( T ) decaying asT → HtorT → Zt . The search utilises a dataset ofppcollisions at√s̅=13TeV collected with the ATLAS detector during the 2015-2018 data-taking period of the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb ⁻¹ . Data are analysed in final states containing a single lepton with multiple jets andb -jets. The presence of boosted heavy resonances in the event is exploited to discriminate the signal from the Standard Model background. No significant excess above the Standard Model expectation is observed, and 95% CL upper limits are set on the production cross section ofTquarks in different decay channels. The results are interpreted in several benchmark scenarios to set limits on the mass and universal coupling strength ( κ ) of the vector-like quark. For singletTquarks,κvalues above 0.53 are excluded for all masses below 2.3 TeV. At a mass of 1.6 TeV,κvalues as low as 0.35 are excluded. ForTquarks in the doublet scenario, where the production cross section is much lower,κvalues above 0.72 are excluded for all masses below 1.7 TeV, and this exclusion is extended toκabove 0.55 for low masses around 1.0 TeV.

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