Search for production of a single vectorlike quark decaying to <math display="inline"><mi>t</mi><mi>H</mi></math> or <math display="inline"><mi>t</mi><mi>Z</mi></math> in the all-hadronic final state in <math display="inline"><mi>p</mi><mi>p</mi></math> collisions at <math display="inline"><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math>

Benecke, Anna;Bethani, Agni;Bruno, Giacomo;Caputo, Claudio;CMS;et.al.
(2024) Physical review D — Vol. 110 (2024)

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Abstract
A search for electroweak production of a single vectorlike <math display="inline"><mi>T</mi></math> quark in association with a bottom (<math display="inline"><mi>b</mi></math>) quark in the all-hadronic decay channel is presented. This search uses proton-proton collision data at <math display="inline"><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math> collected by the CMS experiment at the CERN LHC during 2016–2018, corresponding to an integrated luminosity of <math display="inline"><mn>138</mn><mtext> </mtext><mtext> </mtext><msup><mi>fb</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. The <math display="inline"><mi>T</mi></math> quark is assumed to have charge <math display="inline"><mn>2</mn><mo>/</mo><mn>3</mn></math> and decay to a top (<math display="inline"><mi>t</mi></math>) quark and a Higgs (<math display="inline"><mi>H</mi></math>) or <math display="inline"><mi>Z</mi></math> boson. Hadronic decays of the <math display="inline"><mi>t</mi></math> quark and the <math display="inline"><mi>H</mi></math> or <math display="inline"><mi>Z</mi></math> boson are reconstructed from the kinematic properties of jets, including those containing <math display="inline"><mi>b</mi></math> hadrons. No deviation from the standard model prediction is observed in the reconstructed <math display="inline"><mi>t</mi><mi>H</mi></math> and <math display="inline"><mi>t</mi><mi>Z</mi></math> invariant mass distributions. The 95% confidence level upper limits on the product of the production cross section and branching fraction of a <math display="inline"><mi>T</mi></math> quark produced in association with a <math display="inline"><mi>b</mi></math> quark and decaying via <math display="inline"><mi>t</mi><mi>H</mi></math> or <math display="inline"><mi>t</mi><mi>Z</mi></math> range from 1260 to 68 fb for <math display="inline"><mi>T</mi></math> quark masses of 600–1200 GeV.
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Benecke, A., Bethani, A., Bruno, G., Caputo, C., Delaere, C., Donertas, I. S., Giammanco, A., Jaffel, K., Jain, S., Jain, S., Lemaitre, V., Lidrych, J., Mastrapasqua, P., Mondal, K., Tran, T. T., Wertz, S., CMS, & et al. (2024). Search for production of a single vectorlike quark decaying to <math display=“inline”><mi>t</mi><mi>H</mi></math> or <math display=“inline”><mi>t</mi><mi>Z</mi></math> in the all-hadronic final state in <math display=“inline”><mi>p</mi><mi>p</mi></math> collisions at <math display=“inline”><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math>. Physical review D, 110. https://doi.org/10.1103/PhysRevD.110.072012 (Original work published 2024)