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| CMS-HIG-18-015 ; CERN-EP-2019-277 | ||
| Search for charged Higgs bosons decaying into a top and a bottom quark in the all-jet final state of pp collisions at $\sqrt{s}=$ 13 TeV | ||
| CMS Collaboration | ||
| 21 January 2020 | ||
| JHEP 07 (2020) 126 | ||
| Abstract: A search for charged Higgs bosons ($\mathrm{H}^\pm$) decaying into a top and a bottom quark in the all-jet final states 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 excess is observed above the expected background. Model-independent upper limits at 95% confidence level are set on the product of the $\mathrm{H}^\pm$ production cross section and branching fraction in two scenarios. For production in association with a top quark, limits of 21.3 to 0.007 pb are obtained for $\mathrm{H}^\pm$ masses in the range of 0.2 to 3 TeV. Combining this with data from a search in leptonic final states results in improved limits of 9.25 to 0.005 pb. The complementary $s$-channel production of an $\mathrm{H}^\pm$ is investigated in the mass range of 0.8 to 3 TeV and the corresponding upper limits are 4.5 to 0.023 pb. These results are interpreted using different minimal supersymmetric extensions of the standard model. | ||
| Links: e-print arXiv:2001.07763 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
The LO diagrams for production of a heavy charged Higgs boson, showing the production with a top and bottom quark (4FS) (left) and via an $s$-channel process (right). |
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Figure 1-a:
The LO diagrams for production of a heavy charged Higgs boson, showing the production with a top and bottom quark (4FS) (left) and via an $s$-channel process (right). |
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Figure 1-b:
The LO diagrams for production of a heavy charged Higgs boson, showing the production with a top and bottom quark (4FS) (left) and via an $s$-channel process (right). |
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Figure 2:
Data and SM background for the event sample with one t jet as a function of the charged Higgs boson candidate mass. The category t1b is shown and the background normalization is fixed to the SM expectation. The signal mass distributions for associated and $s$-channel production of an ${\mathrm{\tilde{H}^{\pm_j}}}$ with $ {m_{\mathrm{H} ^\pm}} = $ 1 TeV normalized with a cross section times branching fraction of 1 pb are superimposed as open histograms. The signal mass window "in'' for associated production 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 $ {\mathrm{t} ^\text {res}} $ selection in simulated ${\mathrm{t} {}\mathrm{\bar{t}}}$ 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 ${\mathrm{t} ^\text {res}}$ (right) for the signal model and background with normalization fixed to the SM expectation. The dominant background containing misidentified b-jets is primarily composed of QCD multijet processes. The expectation for a signal with $ {m_{\mathrm{H} ^\pm}} = $ 0.8 TeV is also shown. |
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Figure 3-a:
The efficiency of the $ {\mathrm{t} ^\text {res}} $ selection in simulated ${\mathrm{t} {}\mathrm{\bar{t}}}$ 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 ${\mathrm{t} ^\text {res}}$ (right) for the signal model and background with normalization fixed to the SM expectation. The dominant background containing misidentified b-jets is primarily composed of QCD multijet processes. The expectation for a signal with $ {m_{\mathrm{H} ^\pm}} = $ 0.8 TeV is also shown. |
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Figure 3-b:
The efficiency of the $ {\mathrm{t} ^\text {res}} $ selection in simulated ${\mathrm{t} {}\mathrm{\bar{t}}}$ 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 ${\mathrm{t} ^\text {res}}$ (right) for the signal model and background with normalization fixed to the SM expectation. The dominant background containing misidentified b-jets is primarily composed of QCD multijet processes. The expectation for a signal with $ {m_{\mathrm{H} ^\pm}} = $ 0.8 TeV is also shown. |
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Figure 4:
Expected event yields for the boosted analysis in the mass window as defined in Fig. 2 for a ${\mathrm{\tilde{H}^{\pm_j}}}$ with mass 1 TeV in each of the signal categories used with the associated production model. The 11 categories on the left contain low jet multiplicity ($N_{\text {jets}} < $ 3), while categories on the right have high jet multiplicity ($N_{\text {jets}} \ge $ 3). The yields observed in data (black markers) are overlaid. The dashed lines represent the yields for an ${\mathrm{\tilde{H}^{\pm_j}}}$ with a mass of 1 TeV and $\sigma \mathcal {B}=$ 1 pb for associated production. The background distributions result from the global fit described in the text for the background-only hypothesis. Similar categories are fitted for the $s$-channel production. |
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Figure 5:
Variables used in the limit extraction. The ${H_{\mathrm {T}}}$ distribution for the boosted analysis and for the category t1b, 2b, $N_{\text {jets}} \geq $ 3 (left), for the associated production channels, with the expected signal shown for $ {m_{\mathrm{H} ^\pm}} = $ 1 TeV. The invariant mass of the ${\mathrm{\tilde{H}^{\pm_j}}}$ candidates for the resolved analysis (right), with the expected signal shown for $ {m_{\mathrm{H} ^\pm}} = $ 0.8 TeV. The background distributions result from the background-only fit discussed in the text. 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:
Variables used in the limit extraction. The ${H_{\mathrm {T}}}$ distribution for the boosted analysis and for the category t1b, 2b, $N_{\text {jets}} \geq $ 3 (left), for the associated production channels, with the expected signal shown for $ {m_{\mathrm{H} ^\pm}} = $ 1 TeV. The invariant mass of the ${\mathrm{\tilde{H}^{\pm_j}}}$ candidates for the resolved analysis (right), with the expected signal shown for $ {m_{\mathrm{H} ^\pm}} = $ 0.8 TeV. The background distributions result from the background-only fit discussed in the text. 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-b:
Variables used in the limit extraction. The ${H_{\mathrm {T}}}$ distribution for the boosted analysis and for the category t1b, 2b, $N_{\text {jets}} \geq $ 3 (left), for the associated production channels, with the expected signal shown for $ {m_{\mathrm{H} ^\pm}} = $ 1 TeV. The invariant mass of the ${\mathrm{\tilde{H}^{\pm_j}}}$ candidates for the resolved analysis (right), with the expected signal shown for $ {m_{\mathrm{H} ^\pm}} = $ 0.8 TeV. The background distributions result from the background-only fit discussed in the text. 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 6:
Upper limits at 95% CL on the cross section times branching fraction as a function of ${m_{\mathrm{H} ^\pm}}$ for the associated (left) and $s$-channel (right) processes. 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 for the expected limits are also shown. For the associated channel limits are calculated from the resolved (boosted) analysis for ${m_{\mathrm{H} ^\pm}}$ points less (greater) than 0.9 TeV. |
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Figure 6-a:
Upper limits at 95% CL on the cross section times branching fraction as a function of ${m_{\mathrm{H} ^\pm}}$ for the associated (left) and $s$-channel (right) processes. 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 for the expected limits are also shown. For the associated channel limits are calculated from the resolved (boosted) analysis for ${m_{\mathrm{H} ^\pm}}$ points less (greater) than 0.9 TeV. |
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Figure 6-b:
Upper limits at 95% CL on the cross section times branching fraction as a function of ${m_{\mathrm{H} ^\pm}}$ for the associated (left) and $s$-channel (right) processes. 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 for the expected limits are also shown. For the associated channel limits are calculated from the resolved (boosted) analysis for ${m_{\mathrm{H} ^\pm}}$ points less (greater) than 0.9 TeV. |
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Figure 7:
Excluded parameter space region in the hMSSM 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 for the 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 hMSSM 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 for the 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 hMSSM 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 for the 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 \mathrm{t} (\mathrm{b})}} {\mathcal {B}(\mathrm{H} ^\pm \to \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 solid line corresponds to the combined expected limits while the dashed, dotted and dash-dotted 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 \mathrm{t} (\mathrm{b})}} {\mathcal {B}(\mathrm{H} ^\pm \to \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 solid line corresponds to the combined expected limits while the dashed, dotted and dash-dotted represent the contributing channels. |
png pdf |
Figure 8-b:
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 \mathrm{t} (\mathrm{b})}} {\mathcal {B}(\mathrm{H} ^\pm \to \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 solid line corresponds to the combined expected limits while the dashed, dotted and dash-dotted represent the contributing channels. |
| Tables | |
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Table 1:
The systematic uncertainties affecting signal and background for the boosted analysis, evaluated after 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 normalization of each event category. Nuisance parameters with a check mark also affect the shape of the ${H_{\mathrm {T}}}$ spectrum. Sources that do not apply in a given process are marked with dashes. For the $\mathrm{H} ^{\pm}$ signal, the values for $ {m_{\mathrm{H} ^\pm}} = $ 1 TeV and for associated production are shown. |
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Table 2:
The systematic uncertainties in the backgrounds and the signal for the resolved analysis, evaluated after 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 normalization of each event category. 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 process are marked with dashes. For the $\mathrm{H} ^{\pm}$ signal, the values for $ {m_{\mathrm{H} ^\pm}} = $ 0.5 TeV are shown. |
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Table 3:
The numbers 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 0.50, 0.65, and 0.80 TeV, the signal yields are normalized to a $\sigma \mathcal {B}=$ 1 pb 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 \mathrm{t} (\mathrm{b})}} {\mathcal {B}(\mathrm{H} ^\pm \to \mathrm{t} \mathrm{b})}$ with the combined all-jet, single-lepton, and dilepton final states. |
| Summary |
| Results are presented from a search for charged Higgs bosons (${\mathrm{\tilde{H}^{\pm_j}}}$) that decay to a top and a bottom quark in the all-jet final state. The search considers two distinct event topologies. The ${\mathrm{\tilde{H}^{\pm_j}}}$ is reconstructed from a b-tagged jet in combination with a top quark candidate, either resolved as two jets from $\mathrm{q\bar{q}'}$ decays of a W boson and an additional b-tagged jet, or, for highly boosted decay products, reconstructed as a single top-flavored jet or a W jet paired with an additional b-tagged jet. The analysis uses data collected with the CMS detector in 2016 at a center-of-mass energy of $\sqrt{s} =$ 13 TeV, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. No significant deviation is observed above the expected standard model background. Model-independent upper limits at 95% confidence level are set on the product of the ${\mathrm{\tilde{H}^{\pm_j}}}$ production cross section and branching fraction. For production in association with a top quark, limits of 21.3 to 0.007 pb are set for ${\mathrm{\tilde{H}^{\pm_j}}}$ masses in the range 0.2 to 3 TeV. Combining these results with data from a search in leptonic final states of W bosons sets improved limits of 9.25 to 0.005 pb. The complementary $s$-channel production of an ${\mathrm{\tilde{H}^{\pm_j}}}$ is investigated in the mass range 0.8 to 3 TeV and the corresponding upper limits are set at 4.5 to 0.023 pb. Exclusion regions are also presented in the parameter space of the minimal supersymmetric standard model hMSSM and ${M_\mathrm{\mathrm{h}}^\mathrm{125}(\tilde{\chi})}$ benchmark scenarios. |
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