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Search for a light charged Higgs boson in the decay channel in events using pp collisions at with the ATLAS detector

et al.
Abstract

A search for a charged Higgs boson (H+) in $$t\bar{t}$$ decays is presented, where one of the top quarks decays via t→H+b, followed by H+→ two jets ($$c\bar{s}$$). The other top quark decays to Wb, where the W boson then decays into a lepton (e/μ) and a neutrino. The data were recorded in pp collisions at $$\sqrt{s} = 7~\mathrm {TeV}$$ by the ATLAS detector at the LHC in 2011, and correspond to an integrated luminosity of 4.7 fb−1. With no observation of a signal, 95 % confidence level (CL) upper limits are set on the decay branching ratio of top quarks to charged Higgs bosons varying between 5 % and 1 % for H+ masses between 90 GeV and 150 GeV, assuming $$\mathcal{B}(H^{+} \rightarrow c\bar{s})=100~\%$$.

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