Search for charged Higgs bosons decaying into top and a bottom quark in the fully hadronic final state at 13 TeV

A search for charged Higgs bosons decaying into a top and a bottom quark-antiquark pair in the fully hadronic final state is presented. The analysis uses LHC proton-proton collision data recorded with the CMS detector in 2016 at $\sqrt{s} = 13~\mathrm{TeV}$, corresponding to an integrated luminosity of $35.9~\mathrm{fb}^{-1}$. No significant deviation above the expected background is observed. Model-independent upper limits at $95\%$ confidence level are set on the charged Higgs boson production cross section times branching fraction in two scenarios. For production in association with a top quark, limits of 21.3 to $0.007~\mathrm{pb}$ are calculated for charged boson masses in the range $200~\mathrm{GeV}$ to $3~\mathrm{TeV}$. Combination with data from a search in the leptonic final states results in improved limits of 9.25 to $0.005~\mathrm{pb}$. The complementary s-channel production of a charged Higgs boson is investigated in the mass range $800~\mathrm{GeV}$ to $3~\mathrm{TeV}$ and the corresponding upper limits are 4.5 to $0.023~\mathrm{pb}$. These results are interpreted in different minimal supersymmetric extensions of the standard model.