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| CMS-PAS-HIG-23-012 | ||
| Search for highly energetic double Higgs boson production in the two bottom quark and two vector boson all-hadronic final state | ||
| CMS Collaboration | ||
| 19 July 2024 | ||
| Abstract: A search for standard model (SM) nonresonant Higgs boson pair ($ \mathrm{HH} $) production is performed in the two bottom quark ($ \mathrm{b\overline{b}} $) and all-hadronic two vector boson ($ \mathrm{VV}\to\mathrm{4q} $) final states. The search is carried out in proton-proton collisions at 13 TeV with a dataset corresponding to a total luminosity of 138 fb$ ^{-1} $. The analysis focuses on highly Lorentz-boosted HH candidates, where each Higgs boson's daughter quarks are all merged inside a single large radius jet. A new global particle transformer (GloParT) classifier is used to effectively perform boosted $ \mathrm{VV}\to\mathrm{4q} $ jet identification. The multiplicative modifier of the SM quartic coupling between two Higgs bosons and two vector bosons is observed (expected) to be constrained at 95% confidence level to $ \kappa_\mathrm{2V} \in [-0.04, 2.05] $ ($ [0.05, 1.98] $). | ||
| Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Leading-order diagrams for nonresonant Higgs boson pair production via gluon-gluon fusion (top) and vector boson fusion (bottom). In this note, we refer to the left-most VBF diagram as the $ ({\mathrm{H}\mathrm{V}\mathrm{V}})^2 $ and the right-most as the $ {\mathrm{H}\mathrm{H}\mathrm{V}\mathrm{V}} $ diagram. |
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Figure 1-a:
Leading-order diagrams for nonresonant Higgs boson pair production via gluon-gluon fusion (top) and vector boson fusion (bottom). In this note, we refer to the left-most VBF diagram as the $ ({\mathrm{H}\mathrm{V}\mathrm{V}})^2 $ and the right-most as the $ {\mathrm{H}\mathrm{H}\mathrm{V}\mathrm{V}} $ diagram. |
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Figure 1-b:
Leading-order diagrams for nonresonant Higgs boson pair production via gluon-gluon fusion (top) and vector boson fusion (bottom). In this note, we refer to the left-most VBF diagram as the $ ({\mathrm{H}\mathrm{V}\mathrm{V}})^2 $ and the right-most as the $ {\mathrm{H}\mathrm{H}\mathrm{V}\mathrm{V}} $ diagram. |
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Figure 1-c:
Leading-order diagrams for nonresonant Higgs boson pair production via gluon-gluon fusion (top) and vector boson fusion (bottom). In this note, we refer to the left-most VBF diagram as the $ ({\mathrm{H}\mathrm{V}\mathrm{V}})^2 $ and the right-most as the $ {\mathrm{H}\mathrm{H}\mathrm{V}\mathrm{V}} $ diagram. |
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Figure 1-d:
Leading-order diagrams for nonresonant Higgs boson pair production via gluon-gluon fusion (top) and vector boson fusion (bottom). In this note, we refer to the left-most VBF diagram as the $ ({\mathrm{H}\mathrm{V}\mathrm{V}})^2 $ and the right-most as the $ {\mathrm{H}\mathrm{H}\mathrm{V}\mathrm{V}} $ diagram. |
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Figure 1-e:
Leading-order diagrams for nonresonant Higgs boson pair production via gluon-gluon fusion (top) and vector boson fusion (bottom). In this note, we refer to the left-most VBF diagram as the $ ({\mathrm{H}\mathrm{V}\mathrm{V}})^2 $ and the right-most as the $ {\mathrm{H}\mathrm{H}\mathrm{V}\mathrm{V}} $ diagram. |
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Figure 2:
Differential cross section at 13 TeV center of mass for VBF $ {\mathrm{H}\mathrm{H}} $ production as a function of the invariant mass of the $ {\mathrm{H}\mathrm{H}} $ system ($ m_{\mathrm{H}\mathrm{H}} $) for different diagrams and couplings. |
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Figure 3:
Illustration of the signal and fail analysis region selections in terms of the $ T_\text{Xbb}^\mathrm{bb} $ and BDT scores. |
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Figure 4:
Full set of training jet classes for GloParT. |
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Figure 5:
Receiver operating characteristic (ROC) curve for the $ T_\text{HVV} $ discriminator on VV-candidate jets passing the AK8 online and offline selections for SM $ {\mathrm{H}\mathrm{H}} $ signal versus QCD and $ \mathrm{t} \overline{\mathrm{t}} $ backgrounds. |
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Figure 6:
Distributions of the GloParT $ T_\text{HVV} $ discriminant before (left) and after (right) the Lund plane reweighting of top matched jets. The combined uncertainties from Lund-plane-based scale factors on the MC yield per bin are shown in gray, and are propagated to the data/MC ratio intervals. |
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Figure 6-a:
Distributions of the GloParT $ T_\text{HVV} $ discriminant before (left) and after (right) the Lund plane reweighting of top matched jets. The combined uncertainties from Lund-plane-based scale factors on the MC yield per bin are shown in gray, and are propagated to the data/MC ratio intervals. |
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Figure 6-b:
Distributions of the GloParT $ T_\text{HVV} $ discriminant before (left) and after (right) the Lund plane reweighting of top matched jets. The combined uncertainties from Lund-plane-based scale factors on the MC yield per bin are shown in gray, and are propagated to the data/MC ratio intervals. |
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Figure 7:
Post-background-only-fit distributions of the $ \mathrm{b} \overline{\mathrm{b}} $-candidate jet regressed mass ($ {m_\mathrm{reg}^\mathrm{bb}} $) in the ggF (left) and VBF (right) signal regions. |
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Figure 7-a:
Post-background-only-fit distributions of the $ \mathrm{b} \overline{\mathrm{b}} $-candidate jet regressed mass ($ {m_\mathrm{reg}^\mathrm{bb}} $) in the ggF (left) and VBF (right) signal regions. |
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Figure 7-b:
Post-background-only-fit distributions of the $ \mathrm{b} \overline{\mathrm{b}} $-candidate jet regressed mass ($ {m_\mathrm{reg}^\mathrm{bb}} $) in the ggF (left) and VBF (right) signal regions. |
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Figure 8:
Observed and expected exclusion limits at 95% CL for the $ {\mathrm{H}\mathrm{H}\to\mathrm{b}\overline{\mathrm{b}}\mathrm{V}\mathrm{V}} $ signal SM production cross section (top) and cross section at $ \kappa_{2\mathrm{V}}= $ 0 (bottom). |
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Figure 9:
1D upper limits scans on the inclusive $ {\mathrm{H}\mathrm{H}} $ production cross section as a function of $ \kappa_{2\mathrm{V}} $ for $ \kappa_{\mathrm{t}} = \kappa_{\lambda} = \kappa_{\mathrm{V}} = $ 1. |
| Tables | |
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Table 2:
The complete set of input features into GloParT. Three types of inputs are considered: charged PF candidates, neutral PF candidates, and secondary vertices (SVs). |
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Table 3:
Signal efficiency scale factors (SFs) and uncertainties for the BDT selection using the Lund jet plane for different $ {\mathrm{H}\mathrm{H}} $ signals and analysis regions. Both the total combined uncertainty and the components mentioned in the text are shown. |
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Table 4:
Summary of the effect of different systematic uncertainties on the signal or background yields. |
| Summary |
| We describe a search for standard model (SM) nonresonant Higgs boson pair ($ {\mathrm{H}\mathrm{H}} $) production in the two bottom quark ($ \mathrm{b} \overline{\mathrm{b}} $) and two vector boson (VV) all-hadronic final states. We search for two highly boosted Higgs bosons producing fully merged jets; where all H daughter quarks are contained within a single large-radius jet. The established ParticleNet mass-decorrelated tagger is used to select for $ \mathrm{H}\to\mathrm{b}\overline{\mathrm{b}} $ jets and we introduce the new high-performing GloParT tagger for $ \mathrm{H}\to\mathrm{V}\mathrm{V} $ jets. The $ {\mathrm{H}\mathrm{H}} $ signal is extracted using the $ \mathrm{H}\to\mathrm{b}\overline{\mathrm{b}} $ jet regressed mass using control regions with tagger scores inverted to obtain a data-driven estimate of the shape and normalization of the QCD multijet background via a parametric transfer function. The results are interpreted in terms of a multiplicative modifier of the SM quartic coupling between two Higgs bosons and two vector bosons, which is observed (expected) to be constrained to $ [-0.04, 2.05] $ ($ [0.05, 1.98] $) at 95% confidence level. |
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