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| CMS-PAS-HIG-18-015 | ||
| Search for charged Higgs bosons decaying into a top quark and a bottom quark in the fully hadronic final state at 13 TeV | ||
| CMS Collaboration | ||
| July 2019 | ||
| Abstract: A search for charged Higgs bosons decaying into a top and a bottom quark-antiquark pair in the fully hadronic final state is presented. The analysis uses LHC proton-proton collision data recorded with the CMS detector in 2016 at $\sqrt{s} = $ 13 TeV, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. No significant deviation above the expected background is observed. Model-independent upper limits at 95% confidence level are set on the charged Higgs boson production cross section times branching fraction in two scenarios. For production in association with a top quark, limits of 21.3 to 0.007 pb are calculated for charged boson masses in the range 200 GeV to 3 TeV. Combination with data from a search in the leptonic final states results in improved limits of 9.25 to 0.005 pb. The complementary s-channel production of a charged Higgs boson is investigated in the mass range 800 GeV to 3 TeV and the corresponding upper limits are 4.5 to 0.023 pb. These results are interpreted in different minimal supersymmetric extensions of the standard model. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, JHEP 07 (2020) 126. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
LO diagrams for the production of a heavy charged Higgs boson, showing the top quark associated production process in the 4FS (left), the 5FS (middle), and the s-channel process (right). |
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Figure 1-a:
LO diagram for the production of a heavy charged Higgs boson, showing the top quark associated production process in the 4FS process. |
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Figure 1-b:
LO diagram for the production of a heavy charged Higgs boson, showing the top quark associated production process in the 5FS process. |
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Figure 1-c:
LO diagram for the production of a heavy charged Higgs boson, showing the top quark associated production process in the s-channel process. |
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Figure 2:
The SM background for the event sample with one top jet as function of the charged Higgs boson candidate mass. The category t1b is shown. The mass distribution for the model with ${m_{\mathrm{H} ^\pm}} =$ 1 TeV is displayed on top of the backgrounds and normalized with a cross section times branching fraction of 1 pb. The signal mass window "in'' is shown together with the sidebands "below'' and "above'' for the mass hypothesis of 1 TeV. |
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Figure 3:
The efficiency of the ${\text {t}^\text {res}} $ tag in generated ${\mathrm{t} {}\mathrm{\bar{t}}}$ pairs and the misidentification rate for QCD multijet background as a function of top quark or top quark candidate ${p_{\mathrm {T}}}$, respectively (left). The ${p_{\mathrm {T}}}$ distribution of the leading ${\text {t}^\text {res}} $ tagged jet (right). The expectation for a signal with ${m_{\mathrm{H} ^\pm}} =$ 800 GeV is also shown. |
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Figure 3-a:
The efficiency of the ${\text {t}^\text {res}} $ tag in generated ${\mathrm{t} {}\mathrm{\bar{t}}}$ pairs and the misidentification rate for QCD multijet background as a function of top quark or top quark candidate ${p_{\mathrm {T}}}$, respectively. |
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Figure 3-b:
The ${p_{\mathrm {T}}}$ distribution of the leading ${\text {t}^\text {res}} $ tagged jet. The expectation for a signal with ${m_{\mathrm{H} ^\pm}} =$ 800 GeV is also shown. |
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Figure 4:
The expected event yields for the boosted analysis in each of the signal categories used for the associated production channel. The 11 categories on the left contain low jet multiplicity while categories on the right have high jet multiplicity. The yields observed in data (black markers) are overlaid. The green line represents the yields for a cnarged Higgs boson with a mass of 1 TeV and $\sigma \mathcal {B}\,=$ 1 pb. |
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Figure 5:
Variables used in the limit extraction. The ${H_{\mathrm {T}}}$ distribution for the boosted analysis (left), summed over all associated production channels, with the expected signal shown for ${m_{\mathrm{H} ^\pm}} =$ 1 TeV. The invariant mass of the charged Higgs boson candidates for the resolved analysis (right), with the expected signal shown for ${m_{\mathrm{H} ^\pm}} =$ 800 GeV. The distributions are binned according to the statistical precision of the samples, leading to wider bins in the tail of the distributions. |
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Figure 5-a:
The ${H_{\mathrm {T}}}$ distribution for the boosted analysis, summed over all associated production channels, with the expected signal shown for ${m_{\mathrm{H} ^\pm}} =$ 1 TeV. |
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Figure 5-b:
The invariant mass of the charged Higgs boson candidates for the resolved analysis, with the expected signal shown for ${m_{\mathrm{H} ^\pm}} =$ 800 GeV. |
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Figure 6:
Upper limits at 95% CL on the cross section times branching fraction as function of ${m_{\mathrm{H} ^\pm}}$ for the process $ {\sigma _{\mathrm{H} ^\pm}} {\mathcal {B}(\mathrm{H} ^\pm \,\rightarrow \,\mathrm{t} \mathrm{b})}$ (left) and for $ {\sigma ({\mathrm{p}} {\mathrm{p}} \,\rightarrow \mathrm{H} ^\pm)} {\mathcal {B}(\mathrm{H} ^\pm \,\rightarrow \,\mathrm{t} \mathrm{b})}$ (right). The observed upper limits are shown by the solid black markers. The median expected limit (dashed line), 68% (inner green band), and 95% (outer yellow band) confidence-interval expected limits are also shown. |
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Figure 6-a:
Upper limits at 95% CL on the cross section times branching fraction as function of ${m_{\mathrm{H} ^\pm}}$ for the process $ {\sigma _{\mathrm{H} ^\pm}} {\mathcal {B}(\mathrm{H} ^\pm \,\rightarrow \,\mathrm{t} \mathrm{b})}$. The observed upper limits are shown by the solid black markers. The median expected limit (dashed line), 68% (inner green band), and 95% (outer yellow band) confidence-interval expected limits are also shown. |
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Figure 6-b:
Upper limits at 95% CL on the cross section times branching fraction as function of ${m_{\mathrm{H} ^\pm}}$ for $ {\sigma ({\mathrm{p}} {\mathrm{p}} \,\rightarrow \mathrm{H} ^\pm)} {\mathcal {B}(\mathrm{H} ^\pm \,\rightarrow \,\mathrm{t} \mathrm{b})}$. The observed upper limits are shown by the solid black markers. The median expected limit (dashed line), 68% (inner green band), and 95% (outer yellow band) confidence-interval expected limits are also shown. |
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Figure 7:
Excluded parameter space region in the ${m_\mathrm {\mathrm{h}}^\mathrm {mod-}} $ scenario (left) and ${M_\mathrm {\mathrm{h}}^\mathrm {125}(\tilde{\chi})}$ (right). The observed upper limits are shown by the solid black markers. The median expected limit (dashed line), 68% (inner green band), and 95% (outer yellow band) confidence-interval expected limits are also shown. The region below the red line is excluded assuming that the observed neutral Higgs boson is the light CP-even 2HDM Higgs boson with a mass of 125 $\pm$ 3 GeV, where the uncertainty is the theoretical uncertainty in the mass calculation. |
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Figure 7-a:
Excluded parameter space region in the ${m_\mathrm {\mathrm{h}}^\mathrm {mod-}} $ scenario. The observed upper limits are shown by the solid black markers. The median expected limit (dashed line), 68% (inner green band), and 95% (outer yellow band) confidence-interval expected limits are also shown. The region below the red line is excluded assuming that the observed neutral Higgs boson is the light CP-even 2HDM Higgs boson with a mass of 125 $\pm$ 3 GeV, where the uncertainty is the theoretical uncertainty in the mass calculation. |
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Figure 7-b:
Excluded parameter space region in the ${M_\mathrm {\mathrm{h}}^\mathrm {125}(\tilde{\chi})}$. The observed upper limits are shown by the solid black markers. The median expected limit (dashed line), 68% (inner green band), and 95% (outer yellow band) confidence-interval expected limits are also shown. The region below the red line is excluded assuming that the observed neutral Higgs boson is the light CP-even 2HDM Higgs boson with a mass of 125 $\pm$ 3 GeV, where the uncertainty is the theoretical uncertainty in the mass calculation. |
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Figure 8:
Upper limits at 95% CL on the cross section times branching fraction as function of ${m_{\mathrm{H} ^\pm}}$ for the process $ {\sigma _{\mathrm{H} ^\pm}} {\mathcal {B}(\mathrm{H} ^\pm \,\rightarrow \,\mathrm{t} \mathrm{b})}$. The median expected limit (dashed line), 68% (inner green band), and 95% (outer yellow band) confidence-interval expected limits are also shown (left). The relative expected contribution of each channel to the overall combination is shown (right). The black dashed corresponds to the combined expected limits while the red, magenta, and blue represent the contributing channels. |
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Figure 8-a:
Upper limits at 95% CL on the cross section times branching fraction as function of ${m_{\mathrm{H} ^\pm}}$ for the process $ {\sigma _{\mathrm{H} ^\pm}} {\mathcal {B}(\mathrm{H} ^\pm \,\rightarrow \,\mathrm{t} \mathrm{b})}$. The median expected limit (dashed line), 68% (inner green band), and 95% (outer yellow band) confidence-interval expected limits are also shown. |
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Figure 8-b:
The relative expected contribution of each channel to the overall combination is shown. The black dashed corresponds to the combined expected limits while the red, magenta, and blue represent the contributing channels. |
| Tables | |
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Table 1:
The systematic uncertainties affecting signal and background for the boosted analysis, evaluated prior to fitting to data, summed over all final states and categories. The numbers are given in percentage and describe the effect of each nuisance parameter on the overall background normalization. Nuisance parameters with a check mark also affect the shape of the ${H_{\mathrm {T}}}$ spectrum. Sources that do not apply in a given category are marked with long-dashed lines. For the $\mathrm{H} ^{\pm}$ signal, the values for ${m_{\mathrm{H} ^\pm}} =$ 1 TeV are shown. |
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Table 2:
The systematic uncertainties of the backgrounds and the signal for the resolved analysis, evaluated prior to fitting to data, summed over all final states and categories. The numbers are given in percentage and describe the effect of each nuisance parameter on the overall background normalization. Nuisance parameters with a check mark also affect the shape of the $\mathrm{H} ^{\pm}$ candidate mass spectrum. Sources that do not apply in a given category are marked with long-dashed lines. For the $\mathrm{H} ^{\pm}$ signal, the values for ${m_{\mathrm{H} ^\pm}} =$ 500 GeV are shown. |
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Table 3:
Number of expected and observed events for the resolved analysis after all selections. For background processes, the event yields and their corresponding uncertainties are prior to the background-only fit to the data. For the $\mathrm{H} ^{\pm}$ mass hypotheses of 500, 650, and 800 GeV, the signal yields are normalized to a $\sigma \mathcal {B}\,=$ 1pb and the total systematic uncertainties prior to the fit are shown. |
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Table 4:
The upper limit at 95% CL on the $ {\sigma _{\mathrm{H} ^\pm}} {\mathcal {B}(\mathrm{H} ^\pm \,\rightarrow \,\mathrm{t} \mathrm{b})}$ with the combined fully hadronic, single-lepton, and dilepton final states. |
| Summary |
| Results are presented from a search for charged Higgs bosons decaying into a top and a bottom quark in the fully hadronic final state. The search targets two distinct event topologies. The charged Higgs boson is reconstructed from either four resolved jets, two b-tagged jets and two jets from the hadronic decay of a W boson, or as a single top-flavored or W boson jet paired with one or two b-tagged jets. The data are collected with the CMS detector in 2016 at a center-of-mass energy $\sqrt{s} = $ 13 TeV with an integrated luminosity of 35.9 fb$^{-1}$. No significant deviation above the expected background is observed. Model-independent upper limits at 95% confidence level are set on the charged Higgs boson production cross section times branching fraction in two scenarios. For production in association with a top quark, limits of 21.3 to 0.007 pb are calculated for charged boson masses in the range 200 GeV to 3 TeV. Combination with data from a search in the leptonic final states results in improved limits of 9.25 to 0.005 pb. The complementary s-channel production of a charged Higgs boson is investigated in the mass range 800 GeV to 3 TeV\ and the corresponding upper limits are 4.5 to 0.023 pb. Exclusion regions in the parameter space of the minimal supersymmetric standard model ${m_\mathrm{\mathrm{h}}^\mathrm{mod-}} $ and ${M_\mathrm{\mathrm{h}}^\mathrm{125}(\tilde{\chi})} $ benchmark scenarios are presented. |
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Compact Muon Solenoid LHC, CERN |
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