In:
Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2013, No. 3 ( 2013-03)
Abstract:
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 and μ + 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 $ t\overline{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.
Type of Medium:
Online Resource
ISSN:
1029-8479
DOI:
10.1007/JHEP03(2013)076
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2013
detail.hit.zdb_id:
2027350-2
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