Search for a light charged Higgs boson in the decay channel $H^_s16 o cars$ in $tart$ events using pp collisions at $sqrts$ = 7 TeV with the ATLAS detector

Abstract

A search for a charged Higgs boson (H_s16) in ttbar decays is presented, where one of the top quarks decays via t->H_s16b, followed by H_s16->two jets (csbar). The other top quark decays to Wb, where the W boson then decays into a lepton (e/mu) and a neutrino. The data were recorded in pp collisions at sqrt(s) = 7TeV 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_s16 masses between 90 GeV and 150 GeV, assuming Br(H_s16->csbar)=100%.