Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 33: Search for new particles II

T 33.3: Talk

Tuesday, March 31, 2020, 17:30–17:45, H-HS XVI

Search for a singly-produced vector-like quark in the lepton+jets final state with the CMS experiment — •Anna Benecke, Andreas Hinzmann, Roman Kogler, and Arne Reimers — Universität Hamburg

Many models of physics beyond the Standard Model predict new heavy top partners, the vector-like quarks (T). Considering decay modes T → tH, TZ and Wb, vector-like quarks are excluded up to a mass of around 1.3 TeV by pair production searches. If other decays are considered, for example to new scalar degrees of freedom, this bound is considerably weaker. The analysis presented here targets the T → tH decay mode in the lepton+jets final state. The H → bb and t → Wb → l ν b result in a final state with three b jets, which are used to increase the sensitivity of the search. Special emphasis is given to T masses between 600 and 700 GeV, where an analysis in the all-hadronic final state reported an excess above the background expectation of about three standard deviations. Results using pp collision data collected by the CMS experiment in the years 2016 – 2018 at √s = 13 TeV, corresponding to an integrated luminosity of 137 fb⁻¹, are presented.