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A search is made for a vector-like $T$ quark decaying into a Higgs boson anda top quark in 13 TeV proton-proton collisions using the ATLAS detector at theLarge Hadron Collider with a data sample corresponding to an integratedluminosity of 139 fb$^{-1}$. The Higgs-boson and top-quark candidates areidentified in the all-hadronic decay mode, where $H\to b\bar{b}$ and $t\to b W\to b q \bar{q}^\prime$ are reconstructed as large-radius jets. The candidateHiggs boson, top quark, and associated B-hadrons are identified using taggingalgorithms. No significant excess is observed above the background, so limitsare set on the production cross-section of a singlet $T$ quark at 95%confidence level, depending on the mass, $m_T$, and coupling, $\kappa_T$, ofthe vector-like $T$ quark to Standard Model particles. In the considered massrange between 1.0 and 2.3 TeV, the upper limit on the allowed coupling valuesincreases with $m_T$ from a minimum value of 0.35 for 1.07 < $m_T$ < 1.4 TeV to1.6 for $m_T$ = 2.3 TeV.

physical review. d/physical review. d.

Search for single production of a vector-like $T$ quark decaying into a  Higgs boson and top quark with fully hadronic final states using the ATLAS  detector