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| CMS-PAS-HIG-18-026 | ||
| Search for the decay of the Higgs boson to a pair of light pseudoscalar bosons in the $ \mathrm{b\bar{b}b\bar{b}} $ final state in proton-proton collisions at 13 TeV | ||
| CMS Collaboration | ||
| 4 December 2023 | ||
| Abstract: A search is presented for the decay of the 125 GeV Higgs boson (H) to a pair of new light pseudoscalar bosons ($ \mathrm{a} $), followed by the prompt decay of each a boson to a bottom quark-antiquark pair, $ \mathrm{H} \rightarrow \mathrm{a}\mathrm{a} \rightarrow \mathrm{b}\bar{\mathrm{b}}\mathrm{b}\bar{\mathrm{b}} $. The analysis is performed using a data sample of proton-proton collisions collected with the CMS detector at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. To reduce the background from standard model processes, the search requires the Higgs boson to be produced in association with a leptonically decaying W or Z boson. The analysis is sensitive to the production of new light bosons in the 15 $ < \mathrm{m}_{\mathrm{a}} < $ 60 GeV mass range. Assuming the standard model cross sections for $ \mathrm{pp} \rightarrow \mathrm{WH} $ and $ \mathrm{ZH} $, with branching fractions $ \mathcal{B}(\mathrm{H} \rightarrow \mathrm{a}\mathrm{a})= $ 1 and $ \mathcal{B}(\mathrm{a} \rightarrow \mathrm{b}\bar{\mathrm{b}})= $ 1, masses of the a boson between 21 and 60 GeV are excluded. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here. |
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| Figures | |
png pdf |
Figure 1:
Post-fit BDT distributions in the WH channel extracted with the $ m_{\mathrm{a}}= $ 60 GeV signal hypothesis. Signal regions for the 3b (upper) and 4b (lower) event categories are shown separately for the electron (left) and muon (right) channels. The $ m_{\mathrm{a}}= $ 60 GeV and $ m_{\mathrm{a}}= $ 20 GeV signal points are shown scaled by a factor of 100. The horizontal error bars indicate the bin width. |
png pdf |
Figure 1-a:
Post-fit BDT distributions in the WH channel extracted with the $ m_{\mathrm{a}}= $ 60 GeV signal hypothesis. Signal regions for the 3b (upper) and 4b (lower) event categories are shown separately for the electron (left) and muon (right) channels. The $ m_{\mathrm{a}}= $ 60 GeV and $ m_{\mathrm{a}}= $ 20 GeV signal points are shown scaled by a factor of 100. The horizontal error bars indicate the bin width. |
png pdf |
Figure 1-b:
Post-fit BDT distributions in the WH channel extracted with the $ m_{\mathrm{a}}= $ 60 GeV signal hypothesis. Signal regions for the 3b (upper) and 4b (lower) event categories are shown separately for the electron (left) and muon (right) channels. The $ m_{\mathrm{a}}= $ 60 GeV and $ m_{\mathrm{a}}= $ 20 GeV signal points are shown scaled by a factor of 100. The horizontal error bars indicate the bin width. |
png pdf |
Figure 1-c:
Post-fit BDT distributions in the WH channel extracted with the $ m_{\mathrm{a}}= $ 60 GeV signal hypothesis. Signal regions for the 3b (upper) and 4b (lower) event categories are shown separately for the electron (left) and muon (right) channels. The $ m_{\mathrm{a}}= $ 60 GeV and $ m_{\mathrm{a}}= $ 20 GeV signal points are shown scaled by a factor of 100. The horizontal error bars indicate the bin width. |
png pdf |
Figure 1-d:
Post-fit BDT distributions in the WH channel extracted with the $ m_{\mathrm{a}}= $ 60 GeV signal hypothesis. Signal regions for the 3b (upper) and 4b (lower) event categories are shown separately for the electron (left) and muon (right) channels. The $ m_{\mathrm{a}}= $ 60 GeV and $ m_{\mathrm{a}}= $ 20 GeV signal points are shown scaled by a factor of 100. The horizontal error bars indicate the bin width. |
png pdf |
Figure 2:
Post-fit BDT distributions in the ZH channel extracted with the $ m_{\mathrm{a}}= $ 60 GeV signal hypothesis. Signal regions for the 3b (upper) and 4b (lower) event categories are shown separately for the electron (left) and muon (right) channels. The $ m_{\mathrm{a}}= $ 60 GeV and $ m_{\mathrm{a}}= $ 20 GeV signal points are shown scaled by a factor of 100. The horizontal error bars indicate the bin width. |
png pdf |
Figure 2-a:
Post-fit BDT distributions in the ZH channel extracted with the $ m_{\mathrm{a}}= $ 60 GeV signal hypothesis. Signal regions for the 3b (upper) and 4b (lower) event categories are shown separately for the electron (left) and muon (right) channels. The $ m_{\mathrm{a}}= $ 60 GeV and $ m_{\mathrm{a}}= $ 20 GeV signal points are shown scaled by a factor of 100. The horizontal error bars indicate the bin width. |
png pdf |
Figure 2-b:
Post-fit BDT distributions in the ZH channel extracted with the $ m_{\mathrm{a}}= $ 60 GeV signal hypothesis. Signal regions for the 3b (upper) and 4b (lower) event categories are shown separately for the electron (left) and muon (right) channels. The $ m_{\mathrm{a}}= $ 60 GeV and $ m_{\mathrm{a}}= $ 20 GeV signal points are shown scaled by a factor of 100. The horizontal error bars indicate the bin width. |
png pdf |
Figure 2-c:
Post-fit BDT distributions in the ZH channel extracted with the $ m_{\mathrm{a}}= $ 60 GeV signal hypothesis. Signal regions for the 3b (upper) and 4b (lower) event categories are shown separately for the electron (left) and muon (right) channels. The $ m_{\mathrm{a}}= $ 60 GeV and $ m_{\mathrm{a}}= $ 20 GeV signal points are shown scaled by a factor of 100. The horizontal error bars indicate the bin width. |
png pdf |
Figure 2-d:
Post-fit BDT distributions in the ZH channel extracted with the $ m_{\mathrm{a}}= $ 60 GeV signal hypothesis. Signal regions for the 3b (upper) and 4b (lower) event categories are shown separately for the electron (left) and muon (right) channels. The $ m_{\mathrm{a}}= $ 60 GeV and $ m_{\mathrm{a}}= $ 20 GeV signal points are shown scaled by a factor of 100. The horizontal error bars indicate the bin width. |
png pdf |
Figure 3:
Observed and expected limits on the signal strength $ \mu = \sigma(\mathrm{V}\mathrm{H}) \mathcal{B}(\mathrm{H}\to\mathrm{a}\mathrm{a}\to\mathrm{b}\overline{\mathrm{b}}\mathrm{b}\overline{\mathrm{b}}) / \sigma(\mathrm{V}\mathrm{H})_{\mathrm{SM}} $ in the WH (left) and ZH channel (right). The solid blue line indicates the SM cross section $ \sigma (\mathrm{p}\mathrm{p}\to\mathrm{V}\mathrm{H}) $ with branching fractions $ \mathcal{B}(\mathrm{H}\to\mathrm{a}\mathrm{a})= $ 1 and $ \mathcal{B}(\mathrm{a}\to\mathrm{b}\overline{\mathrm{b}})= $ 1.} |
png pdf |
Figure 3-a:
Observed and expected limits on the signal strength $ \mu = \sigma(\mathrm{V}\mathrm{H}) \mathcal{B}(\mathrm{H}\to\mathrm{a}\mathrm{a}\to\mathrm{b}\overline{\mathrm{b}}\mathrm{b}\overline{\mathrm{b}}) / \sigma(\mathrm{V}\mathrm{H})_{\mathrm{SM}} $ in the WH (left) and ZH channel (right). The solid blue line indicates the SM cross section $ \sigma (\mathrm{p}\mathrm{p}\to\mathrm{V}\mathrm{H}) $ with branching fractions $ \mathcal{B}(\mathrm{H}\to\mathrm{a}\mathrm{a})= $ 1 and $ \mathcal{B}(\mathrm{a}\to\mathrm{b}\overline{\mathrm{b}})= $ 1.} |
png pdf |
Figure 3-b:
Observed and expected limits on the signal strength $ \mu = \sigma(\mathrm{V}\mathrm{H}) \mathcal{B}(\mathrm{H}\to\mathrm{a}\mathrm{a}\to\mathrm{b}\overline{\mathrm{b}}\mathrm{b}\overline{\mathrm{b}}) / \sigma(\mathrm{V}\mathrm{H})_{\mathrm{SM}} $ in the WH (left) and ZH channel (right). The solid blue line indicates the SM cross section $ \sigma (\mathrm{p}\mathrm{p}\to\mathrm{V}\mathrm{H}) $ with branching fractions $ \mathcal{B}(\mathrm{H}\to\mathrm{a}\mathrm{a})= $ 1 and $ \mathcal{B}(\mathrm{a}\to\mathrm{b}\overline{\mathrm{b}})= $ 1.} |
png pdf |
Figure 4:
Observed and expected limits on the signal strength $ \mu = \sigma(\mathrm{V}\mathrm{H}) \mathcal{B}(\mathrm{H}\to\mathrm{a}\mathrm{a}\to\mathrm{b}\overline{\mathrm{b}}\mathrm{b}\overline{\mathrm{b}}) / \sigma(\mathrm{V}\mathrm{H})_{\mathrm{SM}} $ with the WH and ZH channels combined. The solid blue line indicates the SM cross section $ \sigma (\mathrm{p}\mathrm{p}\to\mathrm{V}\mathrm{H}) $ with branching fractions $ \mathcal{B}(\mathrm{H}\to\mathrm{a}\mathrm{a})= $ 1 and $ \mathcal{B}(\mathrm{a}\to\mathrm{b}\overline{\mathrm{b}})= $ 1. |
| Tables | |
png pdf |
Table 1:
Signal region (SR) and control region (CR) requirements in ($ N_{\mathrm{b}} $, $ N_{\text{j}} $) for the WH and ZH channels, where $ N_{\mathrm{b}} $ is the number of b-tagged jets in an event and $ N_{\text{j}} $ is the total number of jets in an event. |
png pdf |
Table 2:
Summary of systematic uncertainties for background and signal event yields in the WH channel. Uncertainties that are negligible are indicated with a dash ($ \text{---} $). |
png pdf |
Table 3:
Summary of systematic uncertainties for background and signal event yields in the ZH channel. Uncertainties that are negligible are indicated with a dash ($ \text{---} $). |
png pdf |
Table 4:
Signal-plus-background fit results for the 3b WH and ZH signal regions extracted with the $ m_{\mathrm{a}}= $ 60 GeV signal hypothesis. The column header indicates the lepton flavor and the BDT bin range. Signal yields are shown for the $ m_{\mathrm{a}}= $ 20 and 60 GeV hypotheses. The background uncertainties account for both systematic and statistical sources. |
png pdf |
Table 5:
Signal-plus-background fit results for the 4b WH and ZH signal regions extracted with the $ m_{\mathrm{a}}=60\,\text{Ge\hspace{-.08em}V} $ signal hypothesis. The column header indicates the lepton flavor and the BDT bin range. Signal yields are shown for the $ m_{\mathrm{a}}= $ 20 and 60 GeV hypotheses. The background uncertainties account for both systematic and statistical sources. |
| Summary |
| A search for exotic decays of the 125 GeV Higgs boson (H) to a pair of new light pseudoscalar bosons $ \mathrm{a} $, followed by decay to four b quark jets, $ \mathrm{H}\to\mathrm{a}\mathrm{a}\to\mathrm{b}\overline{\mathrm{b}}\mathrm{b}\overline{\mathrm{b}} $, is presented, using data recorded with the CMS detector. The analysis is based on an integrated luminosity of 138 fb$^{-1}$ collected at a center-of-mass energy of 13 TeV in 2016--2018. The search is performed in the context of the associated WH and ZH production in which the W or Z boson decays leptonically, $ \mathrm{W}\to\ell\nu $ or $ \mathrm{Z}\to\ell^+\ell^- $, with $ \ell $ an electron or muon. No evidence for the targeted decay mode is observed. Upper limits at 95% confidence level on the signal strength of 0.360 (1.103) are obtained for a pseudoscalar boson mass of 60 (20) GeV, assuming the standard model cross sections $ \sigma (\mathrm{p}\mathrm{p}\to\mathrm{W}\mathrm{H}) = $ 1.37 pb and $ \sigma (\mathrm{p}\mathrm{p}\to\mathrm{Z}\mathrm{H}) = $ 0.86 pb, with branching fractions $ \mathcal{B}(\mathrm{H}\to\mathrm{a}\mathrm{a})= $ 1 and $ \mathcal{B}(\mathrm{a}\to\mathrm{b}\overline{\mathrm{b}})= $ 1. Masses of the $ \mathrm{a} $ boson between 21 and 60 GeV are excluded under the presumptions of the analysis. |
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Compact Muon Solenoid LHC, CERN |
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