Search for pair production of boosted Higgs bosons via vector-boson fusion in the $b\bar{b}b\bar{b}$ final state using $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector

The ATLAS collaboration
CERN-EP-2024-092, 2024.

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

    10.17182/hepdata.150977.v1/t6

    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

    10.17182/hepdata.150977.v1/t8

    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

    10.17182/hepdata.150977.v1/t9

    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

    10.17182/hepdata.150977.v1/t10

    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

    10.17182/hepdata.150977.v1/t11

    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

    10.17182/hepdata.150977.v1/t12

    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

    10.17182/hepdata.150977.v1/t15

    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

    10.17182/hepdata.150977.v1/t16

    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

    10.17182/hepdata.150977.v1/t20

    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

    10.17182/hepdata.150977.v1/t21

    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

    10.17182/hepdata.150977.v1/t22

    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 $\kappa_{2V}$ .

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