Search for charged Higgs bosons through the violation of lepton universality in tt events using pp collision data at ?????????S=7 TeV with the ATLAS experiment

In several extensions of the Standard Model, the top quark can decay into a bottom quark and a light charged Higgs boson H +, t ????????? bH +, in addition to the Standard Model decay t ????????? bW. Since W bosons decay to the three lepton generations equally, while H + maypredominantlydecayinto ????????????, charged Higgs bosons can be searched for using the violation of lepton universality in top quark decays. The analysis in this paper is based on 4.6 fb-1 of proton-proton collision data at ?????????s=7 TeV collected by the ATLAS experiment at the Large Hadron Collider. Signatures containing leptons (e or ??????) and/or a hadronically decaying ?????? (?????? had) are used. Event yield ratios between e + ?????? had and e + ??????, as well as between ?????? + ?????? had and?????? + e, final states are measured in the data and compared to predictions from simulations. This ratio-based method reduces the impact of systematic uncertainties in the analysis. No significant deviation from the Standard Model predictions is observed. With the assumption that the branching fraction ????????? (H + ????????? ????????????) is 100%, upper limits in the range 3.2%-4.4% can be placed on the branching fraction ????????? (t ????????? bH +) for charged Higgs boson masses m H+ in the range 90-140 GeV. After combination with results from a search for charged Higgs bosons in t\overline{t} decays using the ?????? had + jets final state, upper limits on ????????? (t ????????? bH +) can be set in the range 0.8%-3.4%, for m H+ in the range 90-160 GeV.[Figure not available: see fulltext.] ?????? 2013 Cern for the benefit of the ATLAS collaboration.