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| CMS-HIG-21-007 ; CERN-EP-2023-004 | ||
| A search for decays of the Higgs boson to invisible particles in events with a top-antitop quark pair or a vector boson in proton-proton collisions at $ \sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| 2 March 2023 | ||
| Eur. Phys. J. C 83 (2023) 933 | ||
| Abstract: A search for decays to invisible particles of Higgs bosons produced in association with a top-antitop quark pair or a vector boson, which both decay to a fully hadronic final state, has been performed using proton-proton collision data collected at $ \sqrt{s}= $ 13 TeV by the CMS experiment at the LHC, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. The 95% confidence level upper limit set on the branching fraction of the 125 GeV Higgs boson to invisible particles, $ {\mathcal{B}(\mathrm{H} \to \text{inv})} $, is 0.47 (0.40 expected), assuming standard model production cross sections. The results of this analysis are combined with previous $ {\mathcal{B}(\mathrm{H} \to \text{inv})} $ searches carried out at $ \sqrt{s}=$ 7, 8, and 13 TeV in complementary production modes. The combined upper limit at 95% confidence level on $ {\mathcal{B}(\mathrm{H} \to \text{inv})} $ is 0.15 (0.08 expected). | ||
| Links: e-print arXiv:2303.01214 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Representative LO Feynman diagrams for the SM Higgs boson production channels $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ and VH. |
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Figure 1-a:
Representative LO Feynman diagrams for the SM Higgs boson production channels $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ and VH. |
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Figure 1-b:
Representative LO Feynman diagrams for the SM Higgs boson production channels $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ and VH. |
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Figure 2:
Distributions of hadronic recoil in the $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ (upper plot) and VH (lower plot) categories for the $ \mu $+jets CR. The black histogram shows the total background (bkg.) prediction from a CR only, B-only fit, while the red histogram shows the yields from a CR+SR S+B fit. |
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Figure 2-a:
Distributions of hadronic recoil in the $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ (upper plot) and VH (lower plot) categories for the $ \mu $+jets CR. The black histogram shows the total background (bkg.) prediction from a CR only, B-only fit, while the red histogram shows the yields from a CR+SR S+B fit. |
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Figure 2-b:
Distributions of hadronic recoil in the $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ (upper plot) and VH (lower plot) categories for the $ \mu $+jets CR. The black histogram shows the total background (bkg.) prediction from a CR only, B-only fit, while the red histogram shows the yields from a CR+SR S+B fit. |
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Figure 3:
Distributions of hadronic recoil in the $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ (upper plot) and VH (lower plot) categories for the e+jets CR. The black histogram shows the total background (bkg.) prediction from a CR only, B-only fit, while the red histogram shows the yields from a CR+SR S+B fit. |
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Figure 3-a:
Distributions of hadronic recoil in the $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ (upper plot) and VH (lower plot) categories for the e+jets CR. The black histogram shows the total background (bkg.) prediction from a CR only, B-only fit, while the red histogram shows the yields from a CR+SR S+B fit. |
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Figure 3-b:
Distributions of hadronic recoil in the $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ (upper plot) and VH (lower plot) categories for the e+jets CR. The black histogram shows the total background (bkg.) prediction from a CR only, B-only fit, while the red histogram shows the yields from a CR+SR S+B fit. |
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Figure 4:
Distributions of hadronic recoil in the $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ category for the $ \mu\mu $+ jets, ee+jets, and $ \ell\ell $+jets CRs (upper plot), and the VH category for the $ \mu\mu $+jets, ee+jets, and $ \gamma $+jets CRs (lower plot). The black histogram shows the total background (bkg.) prediction from a CR only, B-only fit, while the red histogram shows the yields from a CR+SR S+B fit. |
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Figure 4-a:
Distributions of hadronic recoil in the $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ category for the $ \mu\mu $+ jets, ee+jets, and $ \ell\ell $+jets CRs (upper plot), and the VH category for the $ \mu\mu $+jets, ee+jets, and $ \gamma $+jets CRs (lower plot). The black histogram shows the total background (bkg.) prediction from a CR only, B-only fit, while the red histogram shows the yields from a CR+SR S+B fit. |
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Figure 4-b:
Distributions of hadronic recoil in the $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ category for the $ \mu\mu $+ jets, ee+jets, and $ \ell\ell $+jets CRs (upper plot), and the VH category for the $ \mu\mu $+jets, ee+jets, and $ \gamma $+jets CRs (lower plot). The black histogram shows the total background (bkg.) prediction from a CR only, B-only fit, while the red histogram shows the yields from a CR+SR S+B fit. |
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Figure 5:
Distributions of hadronic recoil in the $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ (upper plot) and VH (lower plot) categories for the SR, showing the signal contributions from $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $, VH, $ \mathrm{g}\mathrm{g}\mathrm{H} $, and VBF weighted by $ {\mathcal{B}(\mathrm{H} \to \text{inv})} = $0.10. The black histogram shows the total background (bkg.) prediction from a CR only, B-only fit, while the red histogram shows the yields from a CR+SR S+B fit. |
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Figure 5-a:
Distributions of hadronic recoil in the $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ (upper plot) and VH (lower plot) categories for the SR, showing the signal contributions from $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $, VH, $ \mathrm{g}\mathrm{g}\mathrm{H} $, and VBF weighted by $ {\mathcal{B}(\mathrm{H} \to \text{inv})} = $0.10. The black histogram shows the total background (bkg.) prediction from a CR only, B-only fit, while the red histogram shows the yields from a CR+SR S+B fit. |
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Figure 5-b:
Distributions of hadronic recoil in the $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ (upper plot) and VH (lower plot) categories for the SR, showing the signal contributions from $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $, VH, $ \mathrm{g}\mathrm{g}\mathrm{H} $, and VBF weighted by $ {\mathcal{B}(\mathrm{H} \to \text{inv})} = $0.10. The black histogram shows the total background (bkg.) prediction from a CR only, B-only fit, while the red histogram shows the yields from a CR+SR S+B fit. |
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Figure 6:
Left: Observed and expected limits at 95% CL for the $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ and VH categories using 2016--2018 data. Right: The profile likelihood scan corresponding to observed and expected (where $ {\mathcal{B}(\mathrm{H} \to \text{inv})}= $ 0) limits in the fit to the $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ and VH categories. |
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Figure 6-a:
Left: Observed and expected limits at 95% CL for the $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ and VH categories using 2016--2018 data. Right: The profile likelihood scan corresponding to observed and expected (where $ {\mathcal{B}(\mathrm{H} \to \text{inv})}= $ 0) limits in the fit to the $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ and VH categories. |
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Figure 6-b:
Left: Observed and expected limits at 95% CL for the $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ and VH categories using 2016--2018 data. Right: The profile likelihood scan corresponding to observed and expected (where $ {\mathcal{B}(\mathrm{H} \to \text{inv})}= $ 0) limits in the fit to the $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ and VH categories. |
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Figure 7:
Left: Exclusion limits at 95% CL on $ {\mathcal{B}(\mathrm{H} \to \text{inv})} $. The results are shown separately for each Higgs boson production mode as tagged by the input analyses for Run 1 and Run 2, as well as combined across modes. Right: Scan of the profile negative log-likelihood as a function of $ {\mathcal{B}(\mathrm{H} \to \text{inv})} $ broken down by the Higgs boson production mode as tagged by the input analyses for Run 1 and Run 2. |
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Figure 7-a:
Left: Exclusion limits at 95% CL on $ {\mathcal{B}(\mathrm{H} \to \text{inv})} $. The results are shown separately for each Higgs boson production mode as tagged by the input analyses for Run 1 and Run 2, as well as combined across modes. Right: Scan of the profile negative log-likelihood as a function of $ {\mathcal{B}(\mathrm{H} \to \text{inv})} $ broken down by the Higgs boson production mode as tagged by the input analyses for Run 1 and Run 2. |
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Figure 7-b:
Left: Exclusion limits at 95% CL on $ {\mathcal{B}(\mathrm{H} \to \text{inv})} $. The results are shown separately for each Higgs boson production mode as tagged by the input analyses for Run 1 and Run 2, as well as combined across modes. Right: Scan of the profile negative log-likelihood as a function of $ {\mathcal{B}(\mathrm{H} \to \text{inv})} $ broken down by the Higgs boson production mode as tagged by the input analyses for Run 1 and Run 2. |
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Figure 8:
Upper limits on $ \sigma^{\text{SI}}_{\text{{DM\mbox{-}nucleon}}} $ as a function of DM candidate mass $ m_{\text{DM}} $. Results are presented for a fermion (red) and scalar (yellow) DM candidate. In addition, a vector DM candidate is studied using two UV-comp approaches, the first denoted Vector DM$ ^{\text{UV-comp}} $ [20] (burgundy), and the second a radiative portal version denoted Vector DM$ ^{\text{radiative}}_{m_{2}} $ [23] (orange) with a dark Higgs boson mass of $ m_2 = $ 65 and 100 GeV. Uncertainties are derived from Refs. [99,100,19]. Results are compared to direct-detection searches from CRESST-III [95] (truncated at $ m_{\text{DM}} > $ 1 GeV), DarkSide-50 [96], PandaX-4T [97] and LUX-ZEPLIN [98]. |
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Figure 9:
Observed 95% CL upper limit on $ {\mathcal{B}(\mathrm{H} \to \text{inv})} $ as a function of coupling strength modifiers, $ \kappa_{\text{V}} $ and $ \kappa_{\text{F}} $, for a Higgs boson of mass 125 GeV. Best estimates for $ \kappa_{\text{V}} $ and $ \kappa_{\text{F}} $ from Ref. [11] are shown as a black cross, together with 68 and 95% CL contours. |
| Tables | |
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Table 1:
Offline selection applied to all categories and regions in this analysis to improve signal purity and reduce overlap with the phase space of other $ \mathrm{H} \to \text{inv} $ searches. |
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Table 2:
Categorisation of the $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ and VH production modes in the analysis. No additional selections are applied to the boosted $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ subcategories. |
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Table 3:
Summary of all CR requirements, excluding selections suppressing the QCD multijet background, and excluding the requirement of $ \Delta\phi ($recoil, $\vec{p}_{\mathrm{T},\text{track}}^{\text{miss}}) > \pi$ /2 applied to the $ {\mathrm{t}\bar{\mathrm{t}}} \mathrm{H} $ category in the dilepton CRs. No mass requirements are imposed in the $ \gamma $+jets. |
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Table 4:
Meaning of the symbols used in Eqs. 4 and 5 that define the likelihood function. |
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Table 5:
The ranges corresponding to the maximum and minimum deviations of the event yields from their nominal values, provided where applicable across each region, year of data-taking, category, recoil bin, and all SM background processes, when the respective systematic uncertainty is changed within $ \pm $1 standard deviation. |
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Table 6:
Total post-fit yields in the SRs in each recoil bin and analysis category obtained by summing the contributions from the individual data-taking periods. B-only fits are performed for either CR+SR or CR only cases. The extracted signal yields from an S+B fit are also reported, where the signal strength is weighted by $ {\mathcal{B}(\mathrm{H} \to \text{inv})}=$ 0.10. |
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Table 7:
The observed and expected impacts on $ {\mathcal{B}(\mathrm{H} \to \text{inv})} $ for different groups of uncertainties, where the expected results are produced with $ {\mathcal{B}(\mathrm{H} \to \text{inv})} = $ 0. |
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Table 8:
Data sets and their respective integrated luminosities used for each production mode across Run 1 and Run 2. For some data-taking periods, no $ \mathrm{H} \to \text{inv} $ search have been performed for the given production mode, and are not included in the combination. |
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Table 9:
The observed best fit estimates of $ {\mathcal{B}(\mathrm{H} \to \text{inv})} $, for each analysis channel in the combination, and the 95% CL observed and expected (exp) upper limits on $ {\mathcal{B}(\mathrm{H} \to \text{inv})} $. |
| Summary |
| The results of a search for invisible decays of the Higgs boson produced in association with a top-antitop quark pair ($ {\mathrm{t}\overline{\mathrm{t}}} \mathrm{H} $) or a vector boson (VH, where V stands for either a W or Z boson), which decays to a fully hadronic final state, are presented. The analysis is based on proton-proton collision data collected at $ \sqrt{s}= $ 13 TeV during the 2016-2018 data-taking period by the CMS experiment at the LHC, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. The $ {\mathrm{t}\overline{\mathrm{t}}} \mathrm{H} $ production mechanism is investigated using final states containing b jets, or boosted t quarks or W bosons. The VH production channel focuses on resolving a dijet pair with an invariant mass that is compatible with that of a W or Z boson. No significant excess of events is observed above the predicted SM background. A 95% confidence level upper limit of 0.47 (0.40 expected) is set on the branching fraction of the decay of the Higgs boson to an invisible final state, $ {\mathcal{B}(\mathrm{H} \to \text{inv})} $, assuming SM production cross sections. The results are combined with previous $ {\mathcal{B}(\mathrm{H} \to \text{inv})} $ searches carried out at $ \sqrt{s}= $ 7, 8, and 13 TeV in complementary production modes. The combined 95% confidence level upper limit on $ {\mathcal{B}(\mathrm{H} \to \text{inv})} $ of 0.15 (0.08 expected) is obtained using Run 1 (2011-2012) and Run 2 (2015--2018) data. The combination represents an improvement in sensitivity of 20% relative to the most sensitive single channel. The results are interpreted in the context of a set of Higgs portal models of dark matter interactions to produce model-dependent exclusion limits that complement direct-detection experiments for light mass dark matter candidates. |
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