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Search for single production of vector-like T quarks decaying into Ht or Zt in pp collisions at $$ \sqrt{s} $$ = 13 TeV with the ATLAS detector

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Aad, G 
Abbott, B 
Abeling, K 
Abidi, SH 
Aboulhorma, A 


jats:titleAjats:scbstract</jats:sc> </jats:title>jats:pThis paper describes a search for the single production of an up-type vector-like quark (jats:italicT</jats:italic>) decaying as jats:italicT</jats:italic> → jats:italicHt</jats:italic> or jats:italicT</jats:italic> → jats:italicZt</jats:italic>. The search utilises a dataset of jats:italicpp</jats:italic> collisions at jats:inline-formulajats:alternativesjats:tex-math$$ \sqrt{s} $$</jats:tex-math><mml:math xmlns:mml=""> mml:msqrt mml:mis</mml:mi> </mml:msqrt> </mml:math></jats:alternatives></jats:inline-formula> = 13 TeV collected with the ATLAS detector during the 2015–2018 data-taking period of the Large Hadron Collider, corresponding to an integrated luminosity of 139 fbjats:supjats:italic−</jats:italic>1</jats:sup>. Data are analysed in final states containing a single lepton with multiple jets and jats:italicb</jats:italic>-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 of jats:italicT</jats:italic> quarks in different decay channels. The results are interpreted in several benchmark scenarios to set limits on the mass and universal coupling strength (jats:italicκ</jats:italic>) of the vector-like quark. For singlet jats:italicT</jats:italic> quarks, jats:italicκ</jats:italic> values above 0.53 are excluded for all masses below 2.3 TeV. At a mass of 1.6 TeV, jats:italicκ</jats:italic> values as low as 0.35 are excluded. For jats:italicT</jats:italic> quarks in the doublet scenario, where the production cross section is much lower, jats:italicκ</jats:italic> values above 0.72 are excluded for all masses below 1.7 TeV, and this exclusion is extended to jats:italicκ</jats:italic> above 0.55 for low masses around 1.0 TeV.</jats:p>



5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences

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Journal of High Energy Physics

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Springer Science and Business Media LLC