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Charged Higgs bosons produced in association with a single top quark anddecaying via $H^{\pm} \rightarrow \tau\nu$ are searched for with the ATLASexperiment at the LHC, using proton-proton collision data at $\sqrt{s} = 13$TeV corresponding to an integrated luminosity of 3.2 $\mathrm{fb}^{-1}$. Thefinal state is characterised by the presence of a hadronic $\tau$ decay andmissing transverse momentum, as well as a hadronically decaying top quark,resulting in the absence of high-transverse-momentum electrons and muons. Thedata are found to be consistent with the expected background from StandardModel processes. A statistical analysis leads to $95\%$ confidence-level upperlimits on the production cross section times branching fraction, $\sigma(pp\rightarrow [b]t H^{\pm}) \times \mbox{BR}(H^{\pm} \rightarrow \tau\nu)$,between 1.9 pb and 15 fb, for charged Higgs boson masses ranging from 200 to2000 GeV. The exclusion limits for this search surpass those obtained with theproton-proton collision data recorded at $\sqrt{s} = 8$ TeV.

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Search for charged Higgs bosons produced in association with a top quark  and decaying via $H^{\pm} \rightarrow \tau\nu$ using $pp$ collision data  recorded at $\sqrt{s} = 13$ TeV by the ATLAS detector