Abstract (data abstract)

Search for pair production of boosted Higgs bosons in the $b\bar{b}b\bar{b}$ final state in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector A search for Higgs boson ($H$) pair production via vector boson fusion (VBF) is performed in the Lorentz-boosted regime using 140 fb$^{-1}$ of proton-proton collision data at 13 TeV recorded by the ATLAS detector. Only Higgs boson decays to bottom quark pairs are considered. The search constrains the quartic coupling between two vector bosons and two Higgs bosons relative to its Standard Model prediction, $\kappa_{2V}$, to $0.6 < \kappa_{2V} < 1.5$ at 95% confidence level, when combining with the equivalent resolved analysis. The value $\kappa_{2V} = 0$ is excluded with a significance of $3.8 \sigma$ with other $H$ couplings fixed to their SM values. A search for new heavy spin-0 resonances that would mediate VBF Higgs pair production is carried out in the mass range of 1-5TeV for the first time under multiple model and decay-width assumptions. No significant deviations from the SM hypotheses are observed and exclusion limits at 95% confidence level are derived.

2D $m_H$ distribution for Data 1Pass

Data from Figure 2_a

10.17182/hepdata.150977.v1/t1

The mass planes of the reconstructed Higgs boson candidates for the 1Pass selections of the analysis, shown for the data...
2D $m_H$ distribution for Data 2Pass

Data from Figure 2_b

10.17182/hepdata.150977.v1/t2

The mass planes of the reconstructed Higgs boson candidates for the 2Pass selections of the analysis, shown for the data...
2D $m_H$ distribution for VBF $\kappa_{2V}=1$ 2Pass

Data from Figure 2_c

10.17182/hepdata.150977.v1/t3

The mass planes of the reconstructed Higgs boson candidates for the 2Pass selections of the analysis, shown for the VBF...
2D $m_H$ distribution for VBF $\kappa_{2V}=0$ 2Pass

Data from Figure 2_d

10.17182/hepdata.150977.v1/t4

The mass planes of the reconstructed Higgs boson candidates for the 2Pass selections of the analysis, shown for the VBF...
2D $m_H$ distribution for $m_{X}=1.0$ TeV (narrow width) 2Pass

Data from Figure 2_e

10.17182/hepdata.150977.v1/t5

The mass planes of the reconstructed Higgs boson candidates for the 2Pass selections of the analysis, shown for the $m_{X}...
Observed likelihood scan vs k2V

Data from Figure 5_a

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Observed values of $-2\ln\Lambda$ as a function of $\kappa_{2V}$ for the resolved (dotted green) and boosted (dashed blue) analyses, and...
Expected likelihood scan vs k2V

Data from Figure 5_b

10.17182/hepdata.150977.v1/t7

Expected values of $-2\ln\Lambda$ as a function of $\kappa_{2V}$ for the resolved (dotted green) and boosted (dashed blue) analyses, and...
Obs 2DNLL vs $\kappa_{2V}$ and $\kappa_{\lambda}$(Boosted)

Data from Figure 6_a

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Observed $-2\ln\Lambda$ values of boosted-only result in the $\kappa_{\Lambda}-\kappa_{2V}$ plane.
Obs 2DNLL vs $\kappa_{2V}$ and $\kappa_{\lambda}$(Resolved)

Data from Figure 6_a

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Observed $-2\ln\Lambda$ values of resolved-only result in the $\kappa_{\Lambda}-\kappa_{2V}$ plane.
Obs 2DNLL vs $\kappa_{2V}$ and $\kappa_{\lambda}$(Comb)

Data from Figure 6_a

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Observed $-2\ln\Lambda$ values of combination result in the $\kappa_{\Lambda}-\kappa_{2V}$ plane.
Exp 2DNLL vs $\kappa_{2V}$ and $\kappa_{\lambda}$(Boosted)

Data from Figure 6_b

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Expected $-2\ln\Lambda$ values of boosted-only result in the $\kappa_{\Lambda}-\kappa_{2V}$ plane.
Exp 2DNLL vs $\kappa_{2V}$ and $\kappa_{\lambda}$(Resolved)

Data from Figure 6_b

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Expected $-2\ln\Lambda$ values of resolved-only result in the $\kappa_{\Lambda}-\kappa_{2V}$ plane.
Exp 2DNLL vs $\kappa_{2V}$ and $\kappa_{\lambda}$(Comb)

Data from Figure 6_b

10.17182/hepdata.150977.v1/t13

Expected $-2\ln\Lambda$ values of combination result in the $\kappa_{\Lambda}-\kappa_{2V}$ plane.
Observed or expected limits vs $m_{X}$ (narrow-width)

Data from Figure 8_a

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Expected (dashed black lines) and observed (solid black lines) 95% CL upper limits on the cross-section of spin-0 heavy resonances...
Observed or expected limits vs $m_{X}$ (large-width)

Data from Figure 8_b

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Expected (dashed black lines) and observed (solid black lines) 95% CL upper limits on the cross-section of spin-0 heavy resonances...
Cross-section limit scan vs $\kappa_{2V}$

Data from auxiliary Figure 1

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Observed and expected 95% CL exclusion limits on the production cross-sections of the combined VBF HH process as a function...
Cross-section limit scan vs $\kappa_{\lambda}$

Data from auxiliary Figure 2

10.17182/hepdata.150977.v1/t17

Observed and expected 95% CL exclusion limits on the production cross-sections of the combined HH process as a function of...
Observed likelihood scan vs $\kappa_{\lambda}$

Data from auxiliary Figure 3

10.17182/hepdata.150977.v1/t18

Observed −2 ln Λ as a function of $\kappa_{\lambda}$ with the $\kappa_{2V}$ and $\kappa_{V}$ modifiers fixed to unity.
Expected likelihood scan vs $\kappa_{\lambda}$

Data from auxiliary Figure 4

10.17182/hepdata.150977.v1/t19

Expected −2 ln Λ as a function of $\kappa_{\lambda}$ with the $\kappa_{2V}$ and $\kappa_{V}$ modifiers fixed to unity.
Acceptance $\times$ efficiency vs $m_{X}$ (narrow-width)

Data from auxiliary Figure 6_a

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Cumulative acceptance times efficiency as a function of resonance mass for each event selection step for the narrow-width signal
Acceptance $\times$ efficiency vs $m_{X}$ (large-width)

Data from auxiliary Figure 6_b

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Cumulative acceptance times efficiency as a function of resonance mass for each event selection step for the broad-width signal
Acceptance $\times$ efficiency vs $\kappa_{2V}$

Data from auxiliary Figure 7

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Cumulative acceptance times efficiency as a function of $\kappa_{2V}$ for each event selection step for the nonresonant signal.
m_HH distributions vs k2V

Data from auxiliary Figure 8_a

10.17182/hepdata.150977.v1/t23

The distributions of the invariant mass of the HH system for various values of $\kappa_{2V}$ .

2D $m_H$ distribution for Data 1Pass

2D $m_H$ distribution for Data 2Pass

2D $m_H$ distribution for VBF $\kappa_{2V}=1$ 2Pass

2D $m_H$ distribution for VBF $\kappa_{2V}=0$ 2Pass

2D $m_H$ distribution for $m_{X}=1.0$ TeV (narrow width) 2Pass

Observed likelihood scan vs k2V

Expected likelihood scan vs k2V

Obs 2DNLL vs $\kappa_{2V}$ and $\kappa_{\lambda}$(Boosted)

Obs 2DNLL vs $\kappa_{2V}$ and $\kappa_{\lambda}$(Resolved)

Obs 2DNLL vs $\kappa_{2V}$ and $\kappa_{\lambda}$(Comb)

Exp 2DNLL vs $\kappa_{2V}$ and $\kappa_{\lambda}$(Boosted)

Exp 2DNLL vs $\kappa_{2V}$ and $\kappa_{\lambda}$(Resolved)

Exp 2DNLL vs $\kappa_{2V}$ and $\kappa_{\lambda}$(Comb)

Observed or expected limits vs $m_{X}$ (narrow-width)

Observed or expected limits vs $m_{X}$ (large-width)

Cross-section limit scan vs $\kappa_{2V}$

Cross-section limit scan vs $\kappa_{\lambda}$

Observed likelihood scan vs $\kappa_{\lambda}$

Expected likelihood scan vs $\kappa_{\lambda}$

Acceptance $\times$ efficiency vs $m_{X}$ (narrow-width)

Acceptance $\times$ efficiency vs $m_{X}$ (large-width)

Acceptance $\times$ efficiency vs $\kappa_{2V}$

m_HH distributions vs k2V

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