Search for heavy scalar resonances decaying to Lorentz-boosted Higgs and Higgs-like bosons in the $\mathrm{b\bar{b}}$4q final state at $\sqrt{s}$ = 13 TeV

The CMS collaboration
CMS-B2G-23-007, 2026.

Abstract
A search is performed for a heavy scalar resonance X decaying to a Higgs boson (H) and a Higgs-like scalar boson (Y) in the two bottom quark (H $\to$$\mathrm{b\bar{b}}$) and four quark (Y $\to$ VV $\to$ 4q) final state, where V denotes a W or Z boson. Masses of the X between 900 and 4000 GeV and the Y between 60 and 2800 GeV are considered. The search is performed in data collected by the CMS experiment at the CERN LHC from proton-proton collisions at 13 TeV center-of-mass energy, with a data set corresponding to a total integrated luminosity of 138 fb$^{-1}$. It targets the Lorentz-boosted regime, in which the products of the H $\to$$\mathrm{b\bar{b}}$ decay can be reconstructed as a single large-area jet, and those from the Y $\to$ VV $\to$ 4q decay as either one Y $\to$ 4q or two V to $\mathrm{q\bar{q}}$ jets. Jet identification and mass reconstruction exploit machine-learning tools, including a novel attention-based "particle transformer" for Y $\to$ 4q identification. No significant excess is observed in the data above the standard model background expectation. Upper limits on the product of production cross section and branching fraction as low as 0.2 fb are derived at 95% confidence level for various mass hypotheses. This is the first search at the LHC for scalar resonances in the all-hadronic $\mathrm{b\bar{b}}$VV decay channel.

  • Figure 6 (left)

    Data from Figure 6 (left)

    10.17182/hepdata.167732.v1/t1

    Projected distributions of the $\mathrm{m}_{\mathrm{X}}^{\text{rec}}$ observable in the SP region of the fully merged (FM) category, after a maximum likelihood...

  • Figure 6 (right)

    Data from Figure 6 (right)

    10.17182/hepdata.167732.v1/t2

    Projected distributions of the $\mathrm{m}_{\mathrm{Y}}^{\text{rec}}$ observable in the SP region of the fully merged (FM) category, after a maximum likelihood...

  • Figure 7 (left)

    Data from Figure 7 (left)

    10.17182/hepdata.167732.v1/t3

    Projected distributions of the $\mathrm{m}_{\mathrm{X}}^{\text{rec}}$ observable in the SP region of the semimerged (SM) category, after a maximum likelihood fit...

  • Figure 7 (right)

    Data from Figure 7 (right)

    10.17182/hepdata.167732.v1/t4

    Projected distributions of the $\mathrm{m}_{\mathrm{Y}}^{\text{rec}}$ observable in the SP region of the semimerged (SM) category, after a maximum likelihood fit...

  • Figure 8 (left)

    Data from {fig_name} (right)

    10.17182/hepdata.167732.v1/t5

    The 2D pulls in the $\mathrm{m}_{\mathrm{X}}^{\text{rec}}$ and $\mathrm{m}_{\mathrm{Y}}^{\text{rec}}$ observables in the SP region of the fully merged (FM) category, after...

  • Figure 8 (right)

    Example location

    10.17182/hepdata.167732.v1/t6

    The 2D pulls in the $\mathrm{m}_{\mathrm{X}}^{\text{rec}}$ and $\mathrm{m}_{\mathrm{Y}}^{\text{rec}}$ observables in the SP region of the semimerged (SM) category, after a...

  • Figure 9

    Data from Figure 9

    10.17182/hepdata.167732.v1/t7

    Median expected and observed upper limits at 95% CL on production cross section times branching fraction for $\mathrm{X} \to \mathrm{HY}...

  • Figure 10 ($\mathrm{m}_{\mathrm{X}} = 900$ GeV)

    Data from Figure 10 ($\mathrm{m}_{\mathrm{X}} = 900$ GeV)

    10.17182/hepdata.167732.v1/t8

    Expected and observed upper limits at 95% CL on production cross section times branching fraction for $\mathrm{X} \to \mathrm{HY} \to...

  • Figure 10 ($\mathrm{m}_{\mathrm{X}} = 1000$ GeV)

    Data from Figure 10 ($\mathrm{m}_{\mathrm{X}} = 1000$ GeV)

    10.17182/hepdata.167732.v1/t9

    Expected and observed upper limits at 95% CL on production cross section times branching fraction for $\mathrm{X} \to \mathrm{HY} \to...

  • Figure 10 ($\mathrm{m}_{\mathrm{X}} = 1200$ GeV)

    Data from Figure 10 ($\mathrm{m}_{\mathrm{X}} = 1200$ GeV)

    10.17182/hepdata.167732.v1/t10

    Expected and observed upper limits at 95% CL on production cross section times branching fraction for $\mathrm{X} \to \mathrm{HY} \to...

  • Figure 10 ($\mathrm{m}_{\mathrm{X}} = 1400$ GeV)

    Data from Figure 10 ($\mathrm{m}_{\mathrm{X}} = 1400$ GeV)

    10.17182/hepdata.167732.v1/t11

    Expected and observed upper limits at 95% CL on production cross section times branching fraction for $\mathrm{X} \to \mathrm{HY} \to...

  • Figure 10 ($\mathrm{m}_{\mathrm{X}} = 1600$ GeV)

    Data from Figure 10 ($\mathrm{m}_{\mathrm{X}} = 1600$ GeV)

    10.17182/hepdata.167732.v1/t12

    Expected and observed upper limits at 95% CL on production cross section times branching fraction for $\mathrm{X} \to \mathrm{HY} \to...

  • Figure 10 ($\mathrm{m}_{\mathrm{X}} = 1800$ GeV)

    Data from Figure 10 ($\mathrm{m}_{\mathrm{X}} = 1800$ GeV)

    10.17182/hepdata.167732.v1/t13

    Expected and observed upper limits at 95% CL on production cross section times branching fraction for $\mathrm{X} \to \mathrm{HY} \to...

  • Figure 10 ($\mathrm{m}_{\mathrm{X}} = 2000$ GeV)

    Data from Figure 10 ($\mathrm{m}_{\mathrm{X}} = 2000$ GeV)

    10.17182/hepdata.167732.v1/t14

    Expected and observed upper limits at 95% CL on production cross section times branching fraction for $\mathrm{X} \to \mathrm{HY} \to...

  • Figure 10 ($\mathrm{m}_{\mathrm{X}} = 2200$ GeV)

    Data from Figure 10 ($\mathrm{m}_{\mathrm{X}} = 2200$ GeV)

    10.17182/hepdata.167732.v1/t15

    Expected and observed upper limits at 95% CL on production cross section times branching fraction for $\mathrm{X} \to \mathrm{HY} \to...

  • Figure 10 ($\mathrm{m}_{\mathrm{X}} = 2400$ GeV)

    Data from Figure 10 ($\mathrm{m}_{\mathrm{X}} = 2400$ GeV)

    10.17182/hepdata.167732.v1/t16

    Expected and observed upper limits at 95% CL on production cross section times branching fraction for $\mathrm{X} \to \mathrm{HY} \to...

  • Figure 10 ($\mathrm{m}_{\mathrm{X}} = 2500$ GeV)

    Data from Figure 10 ($\mathrm{m}_{\mathrm{X}} = 2500$ GeV)

    10.17182/hepdata.167732.v1/t17

    Expected and observed upper limits at 95% CL on production cross section times branching fraction for $\mathrm{X} \to \mathrm{HY} \to...

  • Figure 10 ($\mathrm{m}_{\mathrm{X}} = 2600$ GeV)

    Data from Figure 10 ($\mathrm{m}_{\mathrm{X}} = 2600$ GeV)

    10.17182/hepdata.167732.v1/t18

    Expected and observed upper limits at 95% CL on production cross section times branching fraction for $\mathrm{X} \to \mathrm{HY} \to...

  • Figure 10 ($\mathrm{m}_{\mathrm{X}} = 2800$ GeV)

    Data from Figure 10 ($\mathrm{m}_{\mathrm{X}} = 2800$ GeV)

    10.17182/hepdata.167732.v1/t19

    Expected and observed upper limits at 95% CL on production cross section times branching fraction for $\mathrm{X} \to \mathrm{HY} \to...

  • Figure 10 ($\mathrm{m}_{\mathrm{X}} = 3000$ GeV)

    Data from Figure 10 ($\mathrm{m}_{\mathrm{X}} = 3000$ GeV)

    10.17182/hepdata.167732.v1/t20

    Expected and observed upper limits at 95% CL on production cross section times branching fraction for $\mathrm{X} \to \mathrm{HY} \to...

  • Figure 10 ($\mathrm{m}_{\mathrm{X}} = 3500$ GeV)

    Data from Figure 10 ($\mathrm{m}_{\mathrm{X}} = 3500$ GeV)

    10.17182/hepdata.167732.v1/t21

    Expected and observed upper limits at 95% CL on production cross section times branching fraction for $\mathrm{X} \to \mathrm{HY} \to...

  • Figure 10 ($\mathrm{m}_{\mathrm{X}} = 4000$ GeV)

    Data from Figure 10 ($\mathrm{m}_{\mathrm{X}} = 4000$ GeV)

    10.17182/hepdata.167732.v1/t22

    Expected and observed upper limits at 95% CL on production cross section times branching fraction for $\mathrm{X} \to \mathrm{HY} \to...

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