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| CMS-PAS-B2G-24-008 | ||
| Search for charged Higgs bosons decaying into a top and a bottom quark in proton-proton collisions at $ \sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| 2025-08-23 | ||
| Abstract: A search is presented for charged Higgs bosons ($ \text{H}^\pm $) in proton-proton ($ \text{pp} $) collision events via the $ \text{pp}\rightarrow $ (q) $ \text{H}^\pm $ processes with $ \text{H}^\pm\rightarrow\text{tb} $ decays. The analysis is based on the data collected at a center-of-mass energy of 13 TeV with the CMS detector at the LHC, corresponding to an integrated luminosity of 138 $ \text{fb}^{-1} $. Charged Higgs bosons in the 200 GeV to 1 TeV mass range are targeted in the search. The results are interpreted in the framework of the generalized two-Higgs-doublet model (g2HDM) assuming the real components of the extra Yukawa couplings $ \rho_{\text{tt}} $ and $ \rho_{\text{tc}} $ range up to unity. No significant excess above the standard model prediction is observed. Stringent upper limits at 95% confidence level are derived on the product of the cross section $ \sigma({\text{pp}\rightarrow $ (q) $ \text{H}^\pm}) $ and branching ratio $ \mathcal{B}({\text{H}^\pm\rightarrow\text{tb}}, {\text{t}\rightarrow \text{bl}\nu}) $, where $ \text{l}=$ e, $\mu $, for $ \text{H}^\pm $ boson masses up to $ m_{\text{H}^\pm}= $ 1 TeV for $ \rho_{\text{tc}} \gtrsim $ 0.15-0.5 depending on the $ m_{\text{H}^\pm} $ and $ \rho_{\text{tt}} $ assumption. The results represent the first search for charged Higgs bosons based on the g2HDM at any collider and complement the existing results on additional neutral Higgs bosons. | ||
| Links: CDS record (PDF) ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Representative tree-level Feynman diagrams for the signal processes: $ \mathrm{p}\mathrm{p}\to\mathrm{H}^{+}, \mathrm{H}^+\to\mathrm{t}\overline{\mathrm{b}} $ (left), and $ \mathrm{p}\mathrm{p}\to\overline{\mathrm{q}}\mathrm{H}^{+},\mathrm{H}^+\to\mathrm{t}\overline{\mathrm{b}} $ (middle and right). |
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Figure 1-a:
Representative tree-level Feynman diagrams for the signal processes: $ \mathrm{p}\mathrm{p}\to\mathrm{H}^{+}, \mathrm{H}^+\to\mathrm{t}\overline{\mathrm{b}} $ (left), and $ \mathrm{p}\mathrm{p}\to\overline{\mathrm{q}}\mathrm{H}^{+},\mathrm{H}^+\to\mathrm{t}\overline{\mathrm{b}} $ (middle and right). |
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Figure 1-b:
Representative tree-level Feynman diagrams for the signal processes: $ \mathrm{p}\mathrm{p}\to\mathrm{H}^{+}, \mathrm{H}^+\to\mathrm{t}\overline{\mathrm{b}} $ (left), and $ \mathrm{p}\mathrm{p}\to\overline{\mathrm{q}}\mathrm{H}^{+},\mathrm{H}^+\to\mathrm{t}\overline{\mathrm{b}} $ (middle and right). |
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Figure 1-c:
Representative tree-level Feynman diagrams for the signal processes: $ \mathrm{p}\mathrm{p}\to\mathrm{H}^{+}, \mathrm{H}^+\to\mathrm{t}\overline{\mathrm{b}} $ (left), and $ \mathrm{p}\mathrm{p}\to\overline{\mathrm{q}}\mathrm{H}^{+},\mathrm{H}^+\to\mathrm{t}\overline{\mathrm{b}} $ (middle and right). |
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Figure 2:
The pre-fit reconstructed $ \mathrm{\widetilde{H}^{\pm}} $ mass distributions in each region using full Run 2 data. Predictions for the signal with $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 600 GeV, is also shown. Beneath each plot the ratio of data to predictions is shown. The uncertainty bars in the ratio plots represent systematic uncertainties. |
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Figure 3:
The pre-fit reconstructed $ H_{\mathrm{T}} $ distributions in each region using full Run 2 data. Predictions for the signal with $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 600 GeV, is also shown. Beneath each plot the ratio of data to predictions is shown. The uncertainty bars in the ratio plots represent systematic uncertainties. |
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Figure 4:
The post-fit pDNN distributions in the SR 2b2j (upper) and 3b3j (lower) for electron (left) and muon (right) channels assuming $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 600 GeV using full Run 2 data. Predictions for the signal with $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 600 GeV, $ \rho_{tc}= $ 0.4, $ \rho_{tt}= $ 0.6 are shown. Beneath each plot the ratio of data to predictions is shown. The uncertainty bars in the ratio plots represent systematic uncertainties. |
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Figure 4-a:
The post-fit pDNN distributions in the SR 2b2j (upper) and 3b3j (lower) for electron (left) and muon (right) channels assuming $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 600 GeV using full Run 2 data. Predictions for the signal with $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 600 GeV, $ \rho_{tc}= $ 0.4, $ \rho_{tt}= $ 0.6 are shown. Beneath each plot the ratio of data to predictions is shown. The uncertainty bars in the ratio plots represent systematic uncertainties. |
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Figure 4-b:
The post-fit pDNN distributions in the SR 2b2j (upper) and 3b3j (lower) for electron (left) and muon (right) channels assuming $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 600 GeV using full Run 2 data. Predictions for the signal with $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 600 GeV, $ \rho_{tc}= $ 0.4, $ \rho_{tt}= $ 0.6 are shown. Beneath each plot the ratio of data to predictions is shown. The uncertainty bars in the ratio plots represent systematic uncertainties. |
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Figure 4-c:
The post-fit pDNN distributions in the SR 2b2j (upper) and 3b3j (lower) for electron (left) and muon (right) channels assuming $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 600 GeV using full Run 2 data. Predictions for the signal with $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 600 GeV, $ \rho_{tc}= $ 0.4, $ \rho_{tt}= $ 0.6 are shown. Beneath each plot the ratio of data to predictions is shown. The uncertainty bars in the ratio plots represent systematic uncertainties. |
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Figure 4-d:
The post-fit pDNN distributions in the SR 2b2j (upper) and 3b3j (lower) for electron (left) and muon (right) channels assuming $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 600 GeV using full Run 2 data. Predictions for the signal with $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 600 GeV, $ \rho_{tc}= $ 0.4, $ \rho_{tt}= $ 0.6 are shown. Beneath each plot the ratio of data to predictions is shown. The uncertainty bars in the ratio plots represent systematic uncertainties. |
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Figure 5:
The post-fit pDNN distributions in the SR 2b2j (upper) and 3b3j (lower) for electron (left) and muon (right) channels assuming $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 1 TeV using full Run 2 data. Predictions for the signal with $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 1 TeV, $ \rho_{tc}= $ 0.4, $ \rho_{tt}= $ 0.6 are shown. Beneath each plot the ratio of data to predictions is shown. The uncertainty bars in the ratio plots represent systematic uncertainties. |
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Figure 5-a:
The post-fit pDNN distributions in the SR 2b2j (upper) and 3b3j (lower) for electron (left) and muon (right) channels assuming $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 1 TeV using full Run 2 data. Predictions for the signal with $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 1 TeV, $ \rho_{tc}= $ 0.4, $ \rho_{tt}= $ 0.6 are shown. Beneath each plot the ratio of data to predictions is shown. The uncertainty bars in the ratio plots represent systematic uncertainties. |
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Figure 5-b:
The post-fit pDNN distributions in the SR 2b2j (upper) and 3b3j (lower) for electron (left) and muon (right) channels assuming $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 1 TeV using full Run 2 data. Predictions for the signal with $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 1 TeV, $ \rho_{tc}= $ 0.4, $ \rho_{tt}= $ 0.6 are shown. Beneath each plot the ratio of data to predictions is shown. The uncertainty bars in the ratio plots represent systematic uncertainties. |
png pdf |
Figure 5-c:
The post-fit pDNN distributions in the SR 2b2j (upper) and 3b3j (lower) for electron (left) and muon (right) channels assuming $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 1 TeV using full Run 2 data. Predictions for the signal with $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 1 TeV, $ \rho_{tc}= $ 0.4, $ \rho_{tt}= $ 0.6 are shown. Beneath each plot the ratio of data to predictions is shown. The uncertainty bars in the ratio plots represent systematic uncertainties. |
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Figure 5-d:
The post-fit pDNN distributions in the SR 2b2j (upper) and 3b3j (lower) for electron (left) and muon (right) channels assuming $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 1 TeV using full Run 2 data. Predictions for the signal with $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 1 TeV, $ \rho_{tc}= $ 0.4, $ \rho_{tt}= $ 0.6 are shown. Beneath each plot the ratio of data to predictions is shown. The uncertainty bars in the ratio plots represent systematic uncertainties. |
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Figure 6:
Observed and expected 95% CL limits on the cross section times branching ratio for different $ \mathrm{\widetilde{H}^{\pm}} $ mass hypotheses with $ \rho_{tc} = $ 0.4 and $ \rho_{tt} = $ 0.6 (left). The inner (green) band and the outer (yellow) band represent the regions containing 68% and 95%, respectively, of the distribution of limits expected under the background-only hypothesis. Theoretical prediction with different $ \rho_{tc} $ and $ \rho_{tt} $ couplings are shown with the grey bands representing the corresponding uncertainties for the QCD factorization and renormalization scales and the PDFs. Observed local significance (right) extracted from the pDNN distribution using the full Run 2 results. Expected significances are obtained with the injection of a $ \sigma=$ 0.09 (0.05) pb of g2HDM signal with $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 600 GeV (1 TeV) $. The injected cross sections are picked as the best fit value for $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 600 GeV, and the theoretical prediction for $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 1 TeV assuming $ \rho_{tc,tt}= $ 0.6. |
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Figure 6-a:
Observed and expected 95% CL limits on the cross section times branching ratio for different $ \mathrm{\widetilde{H}^{\pm}} $ mass hypotheses with $ \rho_{tc} = $ 0.4 and $ \rho_{tt} = $ 0.6 (left). The inner (green) band and the outer (yellow) band represent the regions containing 68% and 95%, respectively, of the distribution of limits expected under the background-only hypothesis. Theoretical prediction with different $ \rho_{tc} $ and $ \rho_{tt} $ couplings are shown with the grey bands representing the corresponding uncertainties for the QCD factorization and renormalization scales and the PDFs. Observed local significance (right) extracted from the pDNN distribution using the full Run 2 results. Expected significances are obtained with the injection of a $ \sigma=$ 0.09 (0.05) pb of g2HDM signal with $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 600 GeV (1 TeV) $. The injected cross sections are picked as the best fit value for $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 600 GeV, and the theoretical prediction for $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 1 TeV assuming $ \rho_{tc,tt}= $ 0.6. |
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Figure 6-b:
Observed and expected 95% CL limits on the cross section times branching ratio for different $ \mathrm{\widetilde{H}^{\pm}} $ mass hypotheses with $ \rho_{tc} = $ 0.4 and $ \rho_{tt} = $ 0.6 (left). The inner (green) band and the outer (yellow) band represent the regions containing 68% and 95%, respectively, of the distribution of limits expected under the background-only hypothesis. Theoretical prediction with different $ \rho_{tc} $ and $ \rho_{tt} $ couplings are shown with the grey bands representing the corresponding uncertainties for the QCD factorization and renormalization scales and the PDFs. Observed local significance (right) extracted from the pDNN distribution using the full Run 2 results. Expected significances are obtained with the injection of a $ \sigma=$ 0.09 (0.05) pb of g2HDM signal with $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 600 GeV (1 TeV) $. The injected cross sections are picked as the best fit value for $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 600 GeV, and the theoretical prediction for $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 1 TeV assuming $ \rho_{tc,tt}= $ 0.6. |
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Figure 7:
Observed (expected) excluded phase-space regions as a function of $ m_{\mathrm{\widetilde{H}^{\pm}}} $ and $ \rho_{\mathrm{t}\mathrm{c}} $ for various assumed $ \rho_{\mathrm{t}\mathrm{t}} $ values represented with different colors. The limits are extracted from the pDNN distributions based on g2HDM assuming all the extra Yukawa couplings except $ \rho_{\mathrm{t}\mathrm{t}} $ and $ \rho_{\mathrm{t}\mathrm{c}} $ are zero. The results are obtained from the 95% CL limits on the cross section times branching ratio in Fig 6. |
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Figure 8:
Two times the difference of the negative log-likelihood (NLL) as a function of $ \sigma(\mathrm{p}\mathrm{p}\to(\mathrm{q}^\text{light})\mathrm{H}^\pm)\mathcal{B}(\mathrm{H}^\pm\to\mathrm{t}\mathrm{b}, {\mathrm{t}\to\mathrm{b} \text{l}\nu}) $ and $ \sigma(\mathrm{p}\mathrm{p}\to\mathrm{b}\mathrm{H}^\pm)\mathcal{B}(\mathrm{H}^\pm\to\mathrm{t}\mathrm{b}, {\mathrm{t}\to\mathrm{b} \text{l}\nu}) $ with the best fit point extracted from the pDNN distribution for the signal mass $ m_{\mathrm{\widetilde{H}^{\pm}}} = $ 600 GeV (left), and $ m_{\mathrm{\widetilde{H}^{\pm}}} = $ 1000 GeV (right) using all data-taking periods. The SM and the g2HDM predictions are also shown. The points along the g2HDM prediction line represent different $ \rho_{\mathrm{t}\mathrm{t}} $, $ \rho_{\mathrm{t}\mathrm{c}} $ coupling sets, with all other extra Yukawa couplings assumed to be zero. |
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Figure 8-a:
Two times the difference of the negative log-likelihood (NLL) as a function of $ \sigma(\mathrm{p}\mathrm{p}\to(\mathrm{q}^\text{light})\mathrm{H}^\pm)\mathcal{B}(\mathrm{H}^\pm\to\mathrm{t}\mathrm{b}, {\mathrm{t}\to\mathrm{b} \text{l}\nu}) $ and $ \sigma(\mathrm{p}\mathrm{p}\to\mathrm{b}\mathrm{H}^\pm)\mathcal{B}(\mathrm{H}^\pm\to\mathrm{t}\mathrm{b}, {\mathrm{t}\to\mathrm{b} \text{l}\nu}) $ with the best fit point extracted from the pDNN distribution for the signal mass $ m_{\mathrm{\widetilde{H}^{\pm}}} = $ 600 GeV (left), and $ m_{\mathrm{\widetilde{H}^{\pm}}} = $ 1000 GeV (right) using all data-taking periods. The SM and the g2HDM predictions are also shown. The points along the g2HDM prediction line represent different $ \rho_{\mathrm{t}\mathrm{t}} $, $ \rho_{\mathrm{t}\mathrm{c}} $ coupling sets, with all other extra Yukawa couplings assumed to be zero. |
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Figure 8-b:
Two times the difference of the negative log-likelihood (NLL) as a function of $ \sigma(\mathrm{p}\mathrm{p}\to(\mathrm{q}^\text{light})\mathrm{H}^\pm)\mathcal{B}(\mathrm{H}^\pm\to\mathrm{t}\mathrm{b}, {\mathrm{t}\to\mathrm{b} \text{l}\nu}) $ and $ \sigma(\mathrm{p}\mathrm{p}\to\mathrm{b}\mathrm{H}^\pm)\mathcal{B}(\mathrm{H}^\pm\to\mathrm{t}\mathrm{b}, {\mathrm{t}\to\mathrm{b} \text{l}\nu}) $ with the best fit point extracted from the pDNN distribution for the signal mass $ m_{\mathrm{\widetilde{H}^{\pm}}} = $ 600 GeV (left), and $ m_{\mathrm{\widetilde{H}^{\pm}}} = $ 1000 GeV (right) using all data-taking periods. The SM and the g2HDM predictions are also shown. The points along the g2HDM prediction line represent different $ \rho_{\mathrm{t}\mathrm{t}} $, $ \rho_{\mathrm{t}\mathrm{c}} $ coupling sets, with all other extra Yukawa couplings assumed to be zero. |
| Tables | |
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Table 1:
Input variables of the pDNN$_{3b} $ and pDNN$_{2b} $. Indices run up to including 3 for pDNN$_{3b} $ and 2 for pDNN$_{2b} $. |
| Summary |
| A search for charged Higgs bosons ($ \mathrm{\widetilde{H}^{\pm}} $) in proton-proton (pp) collisions at a center-of-mass energy of 13 TeV has been presented. The processes considered are $ \mathrm{p}\mathrm{p}\to(\mathrm{q})\mathrm{H}^{+} $ with $ \mathrm{H}^{+}\to\mathrm{t}\mathrm{b} $. The mass of the $ \mathrm{\widetilde{H}^{\pm}} $ ($ m_{\mathrm{\widetilde{H}^{\pm}}} $) is scanned over a range from 200 GeV to 1 TeV. No evidence for signal is observed, but a small excess is observed for $ m_{\mathrm{\widetilde{H}^{\pm}}} = $ 600 GeV with local significance of 2.4 standard deviations, corresponding to a global significance of 0.1 standard deviations. The results of the search are also interpreted in the generalized two-Higgs-doublet model (g2HDM) with the real part of extra top quark Yukawa couplings $ \rho_{\mathrm{t}\mathrm{t}} $, $ \rho_{\mathrm{t}\mathrm{c}} < $ 1. Stringent upper limits at 95% confidence level are derived on the product of the cross section $ \sigma({\mathrm{p}\mathrm{p}\to(\mathrm{q})\mathrm{H}^\pm}) $ and branching ratio $ \mathcal{B}({\mathrm{H}^\pm\to\mathrm{t}\mathrm{b}}, {\mathrm{t}\to\mathrm{b} \text{l}\nu}) $, where $ \text{l}=e, \mu $, for $ \mathrm{\widetilde{H}^{\pm}} $ boson masses up to $ m_{\mathrm{\widetilde{H}^{\pm}}}= $ 1 TeV for $ \rho_{\mathrm{t}\mathrm{c}} \gtrsim$ 0.15-0.5 depending on the $ m_{\mathrm{\widetilde{H}^{\pm}}} $ and $ \rho_{\mathrm{t}\mathrm{t}} $ assumption. The results represent the first search for the charged Higgs bosons based on the g2HDM. |
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