Abstract
Abstract:
Charged Higgs bosons produced either in top-quark decays or in association with a top- quark,
subsequently decaying via H± → τ± ντ , are searched for in 36.1 fb−1 of proton–proton
collision data at √s = 13 TeV recorded with the ATLAS detector. Depending on whether the
top-quark produced together with H± decays hadronically or leptonically, the search targets τ+jets
and τ+lepton final states, in both cases with a hadronically decaying τ-lepton. No evidence of a
charged Higgs boson is found. For the mass range of mH ± = 90–2000 GeV, upper limits at the 95%
confidence level are set on the production cross-section of the charged Higgs boson times the
branching fraction B(H± → τ± ντ ) in the range 4.2–0.0025 pb. In the mass range 90–160 GeV,
assuming the Standard Model cross-section for tt production, this corresponds to upper limits
between 0.25% and 0.031% for the branching fraction B(t → bH±) × B(H± → τ± ντ ).