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Type: Journal article
Title: 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
Other Titles: Search for charged Higgs bosons through the violation of lepton universality in tt -bar events using pp collision data at root s = 7 TeV with the ATLAS experiment
Author: The ATLAS Collaboration
Aad, G.
Citation: The Journal of High Energy Physics, 2013; 2013(3):076-1-076-35
Publisher: Springer
Issue Date: 2013
ISSN: 1029-8479
Statement of
G. Aad … P. Jackson … L. Lee … A. Petridis … N. Soni … M.J. White … et al. [The ATLAS Collaboration]
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 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 (τhad) are used. Event yield ratios between e + τhad and e + μ, as well as between μ + τhad 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 B (H+ → τν) is 100%, upper limits in the range 3.2%–4.4% can be placed on the branching fraction B (t → bH+) for charged Higgs boson masses mH+ in the range 90–140 GeV. After combination with results from a search for charged Higgs bosons in tt¯ decays using the τhad + jets final state, upper limits on B (t → bH+) can be set in the range 0.8%–3.4%, for mH+ in the range 90-160 GeV.
Keywords: Hadron-hadron scattering
Rights: Open Access, Copyright CERN, for the benefit of the ATLAS collaboration
DOI: 10.1007/JHEP03(2013)076
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