  A search for a charged Higgs boson (H+) in ttbar decays is presented, where
one of the top quarks decays via t->H+b, followed by H+->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+ masses between 90 GeV and 150
GeV, assuming Br(H+->csbar)=100%.
