Search for vector-like quark pair production in final states with leptons and boosted Higgs bosons at $\sqrt{s}=13~\mathrm{TeV}$

We present a search for pair-produced vector-like top partners (``T quark'') using data from pp collisions at a center-of-mass energy of $\sqrt{s}= 13~\mathrm{TeV}$ that were recorded with the CMS detector in the 2015 data-taking period. The search is carried out in the lepton+jets channel and is most sensitive for final states in which at least one T quark decays to a top quark and a Higgs boson. Since the final decay products tend to be collimated in the detector, jet-substructure techniques are used to identify boosted Higgs boson decays to $b\overline{b}$. No deviation from the Standard Model (SM) background prediction is observed in the data and upper $95\%$ confidence level (CL) exclusion limits on the $\mathrm{T\bar{T}}$ production cross section are calculated for multiple branching fraction scenarios of the T quark. Assuming a branching fraction of $100\%$ for the $\mathrm{T}\rightarrow \mathrm{tH}$ decay, T quark masses below 860 GeV (870 GeV expected) can be excluded.