Search for charged Higgs bosons through the violation of lepton universality in $t\bar{t}$ events using $pp$ collision data at $\sqrt{s}=7$ TeV with the ATLAS experiment
(2013) Journal of High Energy Physics — Vol. 03 (2013)
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- 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 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 (H (+) → τν) 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 decays using the τ (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.
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Tanasijczuk, A. J., ATLAS, & et al. (2013). Search for charged Higgs bosons through the violation of lepton universality in $t\bar{t}$ events using $pp$ collision data at $\sqrt{s}=7$ TeV with the ATLAS experiment. Journal of High Energy Physics, 03. https://doi.org/10.1007/JHEP03(2013)076 (Original work published 2013)