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| CMS-HIG-16-030 ; CERN-EP-2018-121 | ||
| Search for a charged Higgs boson decaying to charm and bottom quarks in proton-proton collisions at $\sqrt{s} = $ 8 TeV | ||
| CMS Collaboration | ||
| 20 August 2018 | ||
| JHEP 11 (2018) 115 | ||
| Abstract: A search for charged Higgs boson decaying to a charm and a bottom quark (${{\mathrm{H}^+} \to\mathrm{c}\mathrm{\bar{b}}} $) is performed using 19.7 fb$^{-1}$ of pp collision data at $\sqrt{s} = $ 8 TeV. The production mechanism investigated in this search is $\mathrm{t\bar{t}}$ pair production in which one top quark decays to a charged Higgs boson and a bottom quark and the other decays to a charged lepton, a neutrino, and a bottom quark. Charged Higgs boson decays to ${\mathrm{c}\mathrm{\bar{b}}} $ are searched for, resulting in a final state containing at least four jets, a charged lepton (muon or electron), and missing transverse momentum. A kinematic fit is performed to identify the pair of jets least likely to be the bottom quarks originating from direct top quark decays and the invariant mass of this pair is used as the final observable in the search. No evidence for the presence of a charged Higgs boson is observed and upper limits at 95% confidence level of 0.8-0.5% are set on the branching fraction ${\mathcal{B}} ({\mathrm{t}\to{\mathrm{H}^+} \mathrm{b}} )$, assuming ${\mathcal{B}} ({{\mathrm{H}^+} \to\mathrm{c}\mathrm{\bar{b}}} ) = $ 1.0 and ${\mathcal{B}} ({\mathrm{t}\to{\mathrm{H}^+} \mathrm{b}} ) + {\mathcal{B}} ({\mathrm{t} \to \mathrm{W} \mathrm{b}} ) = $ 1.0, for the charged Higgs boson mass range 90-150 GeV. | ||
| Links: e-print arXiv:1808.06575 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Feynman diagrams of the $ {{\mathrm {H}} ^+} $ production in top quark pair events (left) compared to the standard model production of $ {{\mathrm {t}\overline {\mathrm {t}}}} $ in lepton+jets final states (right). |
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Figure 1-a:
Feynman diagram of the $ {{\mathrm {H}} ^+} $ production in top quark pair events. |
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Figure 1-b:
Feynman diagram of the standard model production of $ {{\mathrm {t}\overline {\mathrm {t}}}} $ in lepton+jets final states. |
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Figure 2:
Post-fit with a null-$ {{\mathrm {H}} ^+} $ hypothesis on the expected dijet mass distributions from SM backgrounds (cumulative filled histograms) and their ratio of observed to predicted yields for the $ {{\mu}}$+jets (left column) and e+jets (right column) channels. In the first row, events are shown for two b tags together with the fit procedure for a $ {{\mathrm {H}} ^+} $ signal ($ {M_{{{\mathrm {H}} ^+}}} = $ 110 GeV in left and 140 GeV in right). The second (third) row shows the results for events with at least three b tags in the fit procedure for the $ {{\mathrm {H}} ^+} $ search with $ {M_{{{\mathrm {H}} ^+}}} = $ 90-120 (130-150) GeV. The dijet distributions are compared with the $ {{\mathrm {H}} ^+} $ signal shape (dashed line) for $ {M_{{{\mathrm {H}} ^+}}} = $ 110 and 140 GeV. |
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Figure 2-a:
Post-fit with a null-$ {{\mathrm {H}} ^+} $ hypothesis on the expected dijet mass distributions from SM backgrounds (cumulative filled histograms) and their ratio of observed to predicted yields for the $ {{\mu}}$+jets channel. Events are shown for two b tags together with the fit procedure for a $ {{\mathrm {H}} ^+} $ signal ($ {M_{{{\mathrm {H}} ^+}}} = $ 110 GeV). |
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Figure 2-b:
Post-fit with a null-$ {{\mathrm {H}} ^+} $ hypothesis on the expected dijet mass distributions from SM backgrounds (cumulative filled histograms) and their ratio of observed to predicted yields for the e+jets channel. Events are shown for two b tags together with the fit procedure for a $ {{\mathrm {H}} ^+} $ signal ($ {M_{{{\mathrm {H}} ^+}}} = $ 140 GeV). |
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Figure 2-c:
Post-fit with a null-$ {{\mathrm {H}} ^+} $ hypothesis on the expected dijet mass distributions from SM backgrounds (cumulative filled histograms) and their ratio of observed to predicted yields for the $ {{\mu}}$+jets channel. The plots shows the results for events with at least three b tags in the fit procedure for the $ {{\mathrm {H}} ^+} $ search with $ {M_{{{\mathrm {H}} ^+}}} = $ 90-120 GeV. The dijet distributions are compared with the $ {{\mathrm {H}} ^+} $ signal shape (dashed line) for $ {M_{{{\mathrm {H}} ^+}}} = $ 110 GeV. |
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Figure 2-d:
Post-fit with a null-$ {{\mathrm {H}} ^+} $ hypothesis on the expected dijet mass distributions from SM backgrounds (cumulative filled histograms) and their ratio of observed to predicted yields for the e+jets channel. The plots shows the results for events with at least three b tags in the fit procedure for the $ {{\mathrm {H}} ^+} $ search with $ {M_{{{\mathrm {H}} ^+}}} = $ 90-120 GeV. The dijet distributions are compared with the $ {{\mathrm {H}} ^+} $ signal shape (dashed line) for $ {M_{{{\mathrm {H}} ^+}}} = $ 110 GeV. |
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Figure 2-e:
Post-fit with a null-$ {{\mathrm {H}} ^+} $ hypothesis on the expected dijet mass distributions from SM backgrounds (cumulative filled histograms) and their ratio of observed to predicted yields for the $ {{\mu}}$+jets channel. The plots shows the results for events with at least three b tags in the fit procedure for the $ {{\mathrm {H}} ^+} $ search with $ {M_{{{\mathrm {H}} ^+}}} = $ 130-150 GeV. The dijet distributions are compared with the $ {{\mathrm {H}} ^+} $ signal shape (dashed line) for $ {M_{{{\mathrm {H}} ^+}}} = $ 140 GeV. |
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Figure 2-f:
Post-fit with a null-$ {{\mathrm {H}} ^+} $ hypothesis on the expected dijet mass distributions from SM backgrounds (cumulative filled histograms) and their ratio of observed to predicted yields for the e+jets channel. The plots shows the results for events with at least three b tags in the fit procedure for the $ {{\mathrm {H}} ^+} $ search with $ {M_{{{\mathrm {H}} ^+}}} = $ 130-150 GeV. The dijet distributions are compared with the $ {{\mathrm {H}} ^+} $ signal shape (dashed line) for $ {M_{{{\mathrm {H}} ^+}}} = $ 140 GeV. |
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Figure 3:
Upper limits at the 95% confidence level (CL) on the branching fraction $ {\mathcal {B}} ({{\mathrm {t}} \to {{\mathrm {H}} ^+} {\mathrm {b}}})$, assuming $ {\mathcal {B}} ({{{\mathrm {H}} ^+} \to {\mathrm {c}} {\overline {\mathrm {b}}}}) = $ 1.0 and $ {\mathcal {B}} ({{\mathrm {t}} \to {{\mathrm {H}} ^+} {\mathrm {b}}}) + {\mathcal {B}} ({{\mathrm {t}} \to {\mathrm {W}} {\mathrm {b}}}) = $ 1.0, for the combined $ {{\mu}}$+jets and e+jets channels. The black solid line shows the observed limit. The mean expected limit is shown as a blue dashed line and the green/yellow bands indicate the 68/95% confidence intervals for the expected limits. The red dotted line shows the mean expected limit in the absence of systematic uncertainties. |
| Tables | |
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Table 1:
Observed event yields and estimated backgrounds for the $ {{\mu}}$+jets and e+jets channels satisfying the event selection criteria. The number of b-tagged jets is the number of b tags among the four jets with highest $ {p_{\mathrm {T}}} $ in the event. The first and second uncertainty shown corresponds to the statistical and systematic components, respectively. |
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Table 2:
Summary of the relative systematic uncertainties in the event yields for the $ {{\mathrm {H}} ^+} $ signal ($ {M_{{{\mathrm {H}} ^+}}} = $ 120 GeV), simulated SM backgrounds (separated into $ {{\mathrm {t}\overline {\mathrm {t}}}} $ and non-$ {{\mathrm {t}\overline {\mathrm {t}}}} $ components), and the data-driven multijet events. The uncertainties apply to both $ {{\mu}}$+jets and e+jets events, and in the case where the uncertainties in the two channels differ, a range is given. Uncertainties on the shape of templates are marked with an asterisk. |
| Summary |
| A search for charged Higgs boson decaying to a charm and a bottom quark (${{\mathrm{H}^+} \to\mathrm{c}\mathrm{\bar{b}}} $) is performed for the first time. The search uses $\mathrm{t\bar{t}}$ events with a final state containing at least four jets, a charged lepton (muon or electron), and missing transverse momentum. The search is based on the analysis of proton-proton collision data recorded at $\sqrt{s} = $ 8 TeV, corresponding to an integrated luminosity of 19.7 fb$^{-1}$. A kinematic fit is performed to identify the pair of jets least likely to be the $\mathrm{b}$ quarks originating from direct top quark decays and the invariant mass of this pair is used as the final observable in the search. No evidence for the presence of a charged Higgs boson is observed and upper limits at 95% confidence level of 0.8-0.5% are set on the branching fraction ${\mathcal{B}} ({\mathrm{t}\to{\mathrm{H}^+} \mathrm{b}} )$, assuming ${\mathcal{B}} ({{\mathrm{H}^+} \to\mathrm{c}\mathrm{\bar{b}}} ) = 1.0$ and ${\mathcal{B}} ({\mathrm{t}\to{\mathrm{H}^+} \mathrm{b}} ) + {\mathcal{B}} ({\mathrm{t} \to \mathrm{W} \mathrm{b}} ) = $ 1.0, for the charged Higgs boson mass range 90-150 GeV. |
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