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| CMS-PAS-B2G-23-006 | ||
| Search for heavy neutral Higgs bosons A and H in the $ \mathrm{t\bar{t}} $Z final state | ||
| CMS Collaboration | ||
| 25 March 2024 | ||
| Abstract: A direct search for heavy neutral Higgs bosons A and H in the $ \mathrm{t\bar{t}} $Z final state is presented, targeting the process $ \mathrm{A}\rightarrow\mathrm{Z}\mathrm{H} $ with $ \mathrm{H}\rightarrow\mathrm{t\bar{t}} $. For the first time, the final state with decays of the Z boson to electrons or muons together with all-jet decays of the $ \mathrm{t\bar{t}} $ system is considered. The analysis is conducted with proton-proton collision data collected at the CERN LHC with the CMS experiment at $ \sqrt{s}= $ 13 TeV, which correspond to an integrated luminosity of 138 fb$ ^{-1} $. No signal is observed. Model-independent upper limits on the cross section times branching ratio are derived for A and H boson masses up to 2100 GeV and 1900 GeV, respectively, assuming narrow width for both A and H. The results are also interpreted within two-Higgs-doublet models. Regions in parameter space with A boson masses between 550 and up to 1500 GeV, and H boson masses between 350 and up to 700 GeV, depending on the model parameters, are excluded at 95% confidence level, complementing and substantially extending the reach of previous searches. | ||
| Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Definition of the event categories per lepton-flavour channel ($ \mathrm{e}^+\mathrm{e}^- $ or $ \mu^{+}\mu^{-} $) and jet multiplicity $ n $ (5 or $ \geq $6). |
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Figure 2:
Expected $ (\Delta m,p^{\mathrm{Z}}_{\text{T}}) $ distribution for signal events with $ m_{\mathrm{A}}= $ 1000 GeV and $ m_{\mathrm{H}}= $ 600 GeV (blue shading), and boundaries of the elliptical bins (solid lines) used to construct the final observable. |
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Figure 3:
Distribution of events in the $ p^{\mathrm{Z}}_{\text{T}}\times\Delta m $ analysis bins in the CR after the fit to data described in Section 6 with a $ (m_{\mathrm{A}},m_{\mathrm{H}}) $ signal hypothesis of (1000, 350) GeV (left) and (1000,850) GeV (right). The six bins in each region correspond to the six quantiles of the $ p^{\mathrm{Z}}_{\text{T}}\times\Delta m $ distribution, as described in the text. The hatched area represents the total post-fit uncertainty. The signal (solid red line) and background (coloured histograms) distributions are shown with their best fit normalisations from the simultaneous fit to the data (``post-fit''), where the yields in the $ \mathrm{e}\mathrm{e} $ and $ \mu\mu $ channels are added for representation purposes. In the left plot the post-fit signal cross section is found to be 0.0 $ \pm $ 0.1 fb, as indicated in the legend, and therefore the corresponding histogram is not displayed. The signal is also shown for a normalisation to 25 fb (``pre-fit'') in the dashed red line. |
png pdf |
Figure 3-a:
Distribution of events in the $ p^{\mathrm{Z}}_{\text{T}}\times\Delta m $ analysis bins in the CR after the fit to data described in Section 6 with a $ (m_{\mathrm{A}},m_{\mathrm{H}}) $ signal hypothesis of (1000, 350) GeV (left) and (1000,850) GeV (right). The six bins in each region correspond to the six quantiles of the $ p^{\mathrm{Z}}_{\text{T}}\times\Delta m $ distribution, as described in the text. The hatched area represents the total post-fit uncertainty. The signal (solid red line) and background (coloured histograms) distributions are shown with their best fit normalisations from the simultaneous fit to the data (``post-fit''), where the yields in the $ \mathrm{e}\mathrm{e} $ and $ \mu\mu $ channels are added for representation purposes. In the left plot the post-fit signal cross section is found to be 0.0 $ \pm $ 0.1 fb, as indicated in the legend, and therefore the corresponding histogram is not displayed. The signal is also shown for a normalisation to 25 fb (``pre-fit'') in the dashed red line. |
png pdf |
Figure 3-b:
Distribution of events in the $ p^{\mathrm{Z}}_{\text{T}}\times\Delta m $ analysis bins in the CR after the fit to data described in Section 6 with a $ (m_{\mathrm{A}},m_{\mathrm{H}}) $ signal hypothesis of (1000, 350) GeV (left) and (1000,850) GeV (right). The six bins in each region correspond to the six quantiles of the $ p^{\mathrm{Z}}_{\text{T}}\times\Delta m $ distribution, as described in the text. The hatched area represents the total post-fit uncertainty. The signal (solid red line) and background (coloured histograms) distributions are shown with their best fit normalisations from the simultaneous fit to the data (``post-fit''), where the yields in the $ \mathrm{e}\mathrm{e} $ and $ \mu\mu $ channels are added for representation purposes. In the left plot the post-fit signal cross section is found to be 0.0 $ \pm $ 0.1 fb, as indicated in the legend, and therefore the corresponding histogram is not displayed. The signal is also shown for a normalisation to 25 fb (``pre-fit'') in the dashed red line. |
png pdf |
Figure 4:
Distributions of $ p^{\mathrm{Z}}_{\text{T}}\times\Delta m $ in the SR after the fit to data with a $ (m_{\mathrm{A}},m_{\mathrm{H}}) $ signal hypothesis of (1000, 350) GeV (left) and (1000, 850) GeV (right). The hatched area represents the total uncertainty. The signal (solid red line) and background (coloured histograms) distributions are shown with their best fit normalisations from the simultaneous fit to the data (``post-fit''), where the yields in the $ \mathrm{e}\mathrm{e} $ and $ \mu\mu $ channels are added for representation purposes. In the left plot the post-fit signal cross section is found to be 0.0 $ \pm $ 0.1 fb, as indicated in the legend, and therefore the corresponding histogram is not displayed. The signal is also shown for a normalisation to 25 fb (``pre-fit'') in the dashed red line. |
png pdf |
Figure 4-a:
Distributions of $ p^{\mathrm{Z}}_{\text{T}}\times\Delta m $ in the SR after the fit to data with a $ (m_{\mathrm{A}},m_{\mathrm{H}}) $ signal hypothesis of (1000, 350) GeV (left) and (1000, 850) GeV (right). The hatched area represents the total uncertainty. The signal (solid red line) and background (coloured histograms) distributions are shown with their best fit normalisations from the simultaneous fit to the data (``post-fit''), where the yields in the $ \mathrm{e}\mathrm{e} $ and $ \mu\mu $ channels are added for representation purposes. In the left plot the post-fit signal cross section is found to be 0.0 $ \pm $ 0.1 fb, as indicated in the legend, and therefore the corresponding histogram is not displayed. The signal is also shown for a normalisation to 25 fb (``pre-fit'') in the dashed red line. |
png pdf |
Figure 4-b:
Distributions of $ p^{\mathrm{Z}}_{\text{T}}\times\Delta m $ in the SR after the fit to data with a $ (m_{\mathrm{A}},m_{\mathrm{H}}) $ signal hypothesis of (1000, 350) GeV (left) and (1000, 850) GeV (right). The hatched area represents the total uncertainty. The signal (solid red line) and background (coloured histograms) distributions are shown with their best fit normalisations from the simultaneous fit to the data (``post-fit''), where the yields in the $ \mathrm{e}\mathrm{e} $ and $ \mu\mu $ channels are added for representation purposes. In the left plot the post-fit signal cross section is found to be 0.0 $ \pm $ 0.1 fb, as indicated in the legend, and therefore the corresponding histogram is not displayed. The signal is also shown for a normalisation to 25 fb (``pre-fit'') in the dashed red line. |
png pdf |
Figure 5:
Expected (left) and observed (right) 95% CL upper limits on the production cross section times branching ratio of the $ \mathrm{A}\to\mathrm{Z}\mathrm{H}\to\mathrm{Z}{\mathrm{t}\overline{\mathrm{t}}} $ process in the $ (m_{\mathrm{A}}, m_{\mathrm{H}}) $ plane. |
png pdf |
Figure 5-a:
Expected (left) and observed (right) 95% CL upper limits on the production cross section times branching ratio of the $ \mathrm{A}\to\mathrm{Z}\mathrm{H}\to\mathrm{Z}{\mathrm{t}\overline{\mathrm{t}}} $ process in the $ (m_{\mathrm{A}}, m_{\mathrm{H}}) $ plane. |
png pdf |
Figure 5-b:
Expected (left) and observed (right) 95% CL upper limits on the production cross section times branching ratio of the $ \mathrm{A}\to\mathrm{Z}\mathrm{H}\to\mathrm{Z}{\mathrm{t}\overline{\mathrm{t}}} $ process in the $ (m_{\mathrm{A}}, m_{\mathrm{H}}) $ plane. |
png pdf |
Figure 6:
Median expected (dashed lines) and observed (filled contours) 95% CL exclusion regions in the ($ m_{\mathrm{H}} $,$ m_{\mathrm{A}} $) parameter space of the type-II 2HDM for $ \tan\beta = $ 0.5 (blue), 1 (orange), and 2 (green). The enclosed regions are excluded. The dash-dotted lines bound the regions where the width of the A boson is up to 25% relative to $ m_{\mathrm{A}} $. |
png pdf |
Figure 7:
Median expected (dashed lines) and observed (filled contours) 95% CL exclusion regions in the type-II 2HDM ($ \tan\beta $, $ m_{\mathrm{A}} $) parameter space at $ m_{\mathrm{H}}= $ 400 GeV (left) and in the ($ \tan\beta $, $ \cos(\beta-\alpha) $) parameter space at $ m_{\mathrm{A}}= $ 600 GeV and $ m_{\mathrm{H}}= $ 400 GeV (right). The enclosed regions are excluded. The dash-dotted lines bound the regions where the width of the A boson is up to 25% relative to $ m_{\mathrm{A}} $. |
png pdf |
Figure 7-a:
Median expected (dashed lines) and observed (filled contours) 95% CL exclusion regions in the type-II 2HDM ($ \tan\beta $, $ m_{\mathrm{A}} $) parameter space at $ m_{\mathrm{H}}= $ 400 GeV (left) and in the ($ \tan\beta $, $ \cos(\beta-\alpha) $) parameter space at $ m_{\mathrm{A}}= $ 600 GeV and $ m_{\mathrm{H}}= $ 400 GeV (right). The enclosed regions are excluded. The dash-dotted lines bound the regions where the width of the A boson is up to 25% relative to $ m_{\mathrm{A}} $. |
png pdf |
Figure 7-b:
Median expected (dashed lines) and observed (filled contours) 95% CL exclusion regions in the type-II 2HDM ($ \tan\beta $, $ m_{\mathrm{A}} $) parameter space at $ m_{\mathrm{H}}= $ 400 GeV (left) and in the ($ \tan\beta $, $ \cos(\beta-\alpha) $) parameter space at $ m_{\mathrm{A}}= $ 600 GeV and $ m_{\mathrm{H}}= $ 400 GeV (right). The enclosed regions are excluded. The dash-dotted lines bound the regions where the width of the A boson is up to 25% relative to $ m_{\mathrm{A}} $. |
| Summary |
| A direct search for heavy neutral Higgs bosons A and H in the $ {\mathrm{t}\overline{\mathrm{t}}} \mathrm{Z} $ final state has been conducted, utilising 138 fb$ ^{-1} $ of proton-proton collision data collected by the CMS experiment at a centre-of-mass energy of 13 TeV. The search targets the process $ \mathrm{A}\to\mathrm{Z}\mathrm{H} $ with $ \mathrm{H}\to{\mathrm{t}\overline{\mathrm{t}}} $. For the first time, the final state with decays of the Z boson to electrons or muons together with all-jet decays of the $ \mathrm{t} \overline{\mathrm{t}} $ system is considered. No signal is observed, and stringent upper limits are set on the cross section times branching ratio for A and H boson masses up to 2100 GeV and 1900 GeV, respectively, assuming narrow resonances. The results are further used to constrain the parameter space of two-Higgs-doublet models. Regions with A boson masses between 550 and up to 1500 GeV, and H boson masses between 350 and up to 700 GeV, are excluded at 95% confidence level, depending on the value of $ \tan\beta $. The results presented in this note do not confirm the excess reported by the ATLAS Collaboration in the region around $ (m_{\mathrm{A}},m_{\mathrm{H}})= $ (650, 450) GeV with a local significance of 2.85 SD [16]. The results complement and substantially extend the reach of previous searches, constraining parameter regions relevant in the context of baryogenesis. |
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