Search for a light charged Higgs boson in the decay channel H +→c¯s in tt̅ events using pp collisions at √ s =7 TeV with the ATLAS detector

Abstract

A search for a charged Higgs boson (<i>H</i>⁺) in [Formula: see text] decays is presented, where one of the top quarks decays via <i>t</i>→<i>H</i>⁺<i>b</i>, followed by <i>H</i>⁺→ two jets ([Formula: see text]). The other top quark decays to <i>Wb</i>, where the <i>W</i> boson then decays into a lepton (<i>e</i>/<i>μ</i>) and a neutrino. The data were recorded in <i>pp</i> collisions at [Formula: see text] 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 <i>H</i>⁺ masses between 90 GeV and 150 GeV, assuming [Formula: see text].