Search for single-production of vector-like quarks decaying into $Wb$ in the fully hadronic final state in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

Abstract

A search for $T$ and $Y$ vector-like quarks produced in proton-proton collisions at a centre-of-mass energy of $13\text{TeV}$ and decaying into $Wb$ in the fully hadronic final state is presented. The search uses 139 fb${}^{-1}$ of data collected by the ATLAS detector at the LHC from 2015 to 2018. The final state is characterised by a hadronically decaying $W$ boson with large Lorentz boost and a $b$-tagged jet, which are used to reconstruct the invariant mass of the vector-like quark candidate. The main background is QCD multijet production, which is estimated using a data-driven method. Upon finding no significant excess in data, mass limits at 95% confidence level are obtained as a function of the global coupling parameter, $\kappa$. The observed lower limits on the masses of $Y$ quarks with $\kappa =0.5$ and $\kappa =0.7$ are 2.0 TeV and 2.4 TeV, respectively. For $T$ quarks, the observed mass limits are 1.4 TeV for $\kappa =0.5$ and 1.9 TeV for $\kappa =0.7$.

42 pages in total, author list starting page 25, 7 figures, 2 tables, published in JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2022-43

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Cited by in corpus (2)

• Search for charged Higgs bosons through vector-like top quark pair production at the LHC
• Searching for single production of vectorlike quarks decaying into Wb at a future muon-proton collider