Publikationsdatum:
2013-03-01
Beschreibung:
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 τν, 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 $ sqrt{s}=7 $ TeV collected by the ATLAS experiment at the Large Hadron Collider. Signatures containing leptons (e or μ) and/or a hadronically decaying τ (τ had) are used. Event yield ratios between e + τ had and e + μ, as well as between μ + τ had andμ + 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 $ mathcal{B} $ (H + → τν) is 100%, upper limits in the range 3.2%–4.4% can be placed on the branching fraction $ mathcal{B} $ (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 $ toverline{t} $ decays using the τ had + jets final state, upper limits on $ mathcal{B} $ (t → bH +) can be set in the range 0.8%–3.4%, for m H+ in the range 90-160 GeV.
Print ISSN:
1126-6708
Digitale ISSN:
1029-8479
Thema:
Physik
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