Abstract (data abstract)

A search for nonresonant Higgs boson ($H$) pair production via gluon and vector boson ($V$) fusion is performed in the four-bottom-quark final state, using proton-proton collision data at 13 TeV corresponding to 138 fb$^{-1}$ collected by the CMS experiment at the LHC. The analysis targets Lorentz-boosted $H$ pairs identified using a graph neural network. It constrains the strengths relative to the standard model of the $H$ self-coupling and the quartic $VVHH$ couplings, $\kappa_{2V}$, excluding $\kappa_{2V} = 0$ for the first time, with a significance of 6.3 standard deviations when other $H$ couplings are fixed to their standard model values.

Figure 1

Data from Figure 1

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The data and fitted signal and background distributions for the $D_{b\overline{b}}$-subleading jet regressed mass for the ggF BDT event category...
Figure 2

Data from Figure 2

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The distributions of the invariant mass of the $HH$ system after a background-only fit to the data, for the VBF...
Figure 3

Data from Figure 3

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Two-parameter profile likelihood test statistic ($-2\Delta\ln\mathcal{L}$) scan in data as a function of $\kappa_{\lambda}$ and $\kappa_{2V}$.
Supplemental Figure 4a

Data from Supplemental Figure 4a

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The data and fitted signal and background distributions for the $D_{b\overline{b}}$-subleading jet regressed mass for the ggF BDT event category...
Supplemental Figure 4b

Data from Supplemental Figure 4b

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The data and fitted signal and background distributions for the $D_{b\overline{b}}$-subleading jet regressed mass for the ggF BDT event category...
Supplemental Figure 4c

Data from Supplemental Figure 4c

10.17182/hepdata.128973.v1/t6

The data and fitted signal and background distributions for the $D_{b\overline{b}}$-subleading jet regressed mass for the ggF QCD multijet background...
Supplemental Figure 5a

Data from Supplemental Figure 5a

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The data in the ggF BDT event category 1 after subtracting all background processes except the QCD multijet one compared...
Supplemental Figure 5b

Data from Supplemental Figure 5b

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The data in the ggF BDT event category 2 after subtracting all background processes except the QCD multijet one compared...
Supplemental Figure 5c

Data from Supplemental Figure 5c

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The data in the ggF BDT event category 3 after subtracting all background processes except the QCD multijet one compared...
Supplemental Figure 6a

Data from Supplemental Figure 6a

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The data and expected background distributions in the $t\overline{t}$ control region of the $D_{b\overline{b}}$-leading jet $m_{ ext{SD}}$.
Supplemental Figure 6b

Data from Supplemental Figure 6b

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The data and expected background distributions in the $t\overline{t}$ control region of the $D_{b\overline{b}}$-leading jet $D_{b\overline{b}}$.
Supplemental Figure 6c

Data from Supplemental Figure 6c

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The data and expected background distributions in the $t\overline{t}$ control region of $m_{HH}$.
Supplemental Figure 6d

Data from Supplemental Figure 6d

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The data and expected background distributions in the $t\overline{t}$ control region of $p_{\text{T} j_{1}}/m_{HH}$.
Supplemental Figure 7

Data from Supplemental Figure 7

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Expected and observed 95% CL upper limits on $HH$ production with respect to the SM expectation ($\kappa_{\lambda}=\kappa_{t}=\kappa_{V}=\kappa_{2V}=1$) in the individual...
Supplemental Figure 8

Data from Supplemental Figure 8

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Expected and observed 95% CL upper limits on $HH$ production with respect to the expectation for $\kappa_{\lambda}=\kappa_{t}=\kappa_{V}=1$, $\kappa_{2V}=0$ in the...
Supplemental Figure 9a

Data from Supplemental Figure 9a

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Observed and expected 95% CL exclusion limit on the product of the inclusive $HH$ production cross section and the branching...
Supplemental Figure 9b

Data from Supplemental Figure 9b

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Observed and expected 95% CL exclusion limit on the product of the inclusive $HH$ production cross section and the branching...
Supplemental Figure 9c

Data from Supplemental Figure 9c

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Observed and expected 95% CL exclusion limit on the product of the inclusive $HH$ production cross section and the branching...
Supplemental Figure 10a

Data from Supplemental Figure 10a

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Observed and expected 95% CL exclusion limit on the product of the VBF $HH$ production cross section and the branching...
Supplemental Figure 10b

Data from Supplemental Figure 10b

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Observed and expected 95% CL exclusion limit on the product of the VBF $HH$ production cross section and the branching...
Supplemental Figure 11

Data from Supplemental Figure 11

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Two-parameter profile likelihood test statistic ($-2\Delta\ln\mathcal{L}$) scan in data as a function of $\kappa_{2V}$ and $\kappa_{V}$.
Supplemental Table 1

Data from Supplemental Table 1

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Major sources of uncertainty in the measurement of the signal strength modifier $\mu$, and their observed impact ($\Delta\mu$) from a...

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Supplemental Figure 9a

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Supplemental Figure 10a

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Supplemental Figure 11

Supplemental Table 1

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