Abstract (data abstract)

CERN-LHC. A search for Higgs boson pair ($hh$) production in association with a vector boson ($W\; {\textrm or}\; Z$) is presented, using 139 $fb^{-1}$ of proton--proton collision data at $\sqrt{s}=13\,\text{TeV}$ recorded with the ATLAS detector at the Large Hadron Collider. The search is performed in final states in which the vector boson decays leptonically ($W\to\ell\nu,\, Z\to\ell\ell,\nu\nu$ with $\ell=e, \mu$) and the Higgs bosons each decay into a pair of $b$-quarks. It targets $Vhh$ signals from both non-resonant $hh$ production, present in the Standard Model (SM), and resonant $hh$ production, as predicted in some SM extensions. For the resonant search, upper limits on the production cross-sections are derived for two specific models: one is the production of a vector boson along with a neutral heavy scalar resonance $H$, in the mass range 260--1000 GeV, that decays into $hh$, and the other is the production of a heavier neutral pseudoscalar resonance $A$ that decays into a $Z$ boson and $H$ boson, where the $A$ boson mass is 360--800 GeV and the $H$ boson mass is 260--400 GeV. Constraints are also derived in the parameter space of two-Higgs-doublet models.

Table 1

Data from Auxiliary Figure 13a

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Acceptance times efficiency as a function of resonant mass for each event selection step in the search for a neutral...
Table 2

Data from Figure 3b

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Acceptance times efficiency as a function of resonant mass for each event selection step in the search for a neutral...
Table 3

Data from Auxiliary Figure 13b

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Acceptance times efficiency as a function of resonant mass for each event selection step in the search for a neutral...
Table 4

Data from Auxiliary Figure 14a

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Acceptance times efficiency as a function of pseudoscalar resonant mass for each event selection step in the search for a...
Table 5

Data from Auxiliary Figure 15a

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Acceptance times efficiency as a function of pseudoscalar resonant mass for each event selection step in the search for a...
Table 6

Data from Auxiliary Figure 16a

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Acceptance times efficiency as a function of pseudoscalar resonant mass for each event selection step in the search for a...
Table 7

Data from Figure 3a

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Acceptance times efficiency as a function of pseudoscalar resonant mass for each event selection step in the search for a...
Table 8

Data from Auxiliary Figure 15c

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Acceptance times efficiency as a function of pseudoscalar resonant mass for each event selection step in the search for a...
Table 9

Data from Auxiliary Figure 16c

10.17182/hepdata.131626.v1/t9

Acceptance times efficiency as a function of pseudoscalar resonant mass for each event selection step in the search for a...
Table 10

Data from Auxiliary Figure 14b

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Acceptance times efficiency as a function of pseudoscalar resonant mass for each event selection step in the search for a...
Table 11

Data from Auxiliary Figure 15b

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Acceptance times efficiency as a function of pseudoscalar resonant mass for each event selection step in the search for a...
Table 12

Data from Auxiliary Figure 16b

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Acceptance times efficiency as a function of pseudoscalar resonant mass for each event selection step in the search for a...
Table 13

Data from Auxiliary Figure 14c

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Acceptance times efficiency as a function of pseudoscalar resonant mass for each event selection step in the search for a...
Table 14

Data from Auxiliary Figure 15d

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Acceptance times efficiency as a function of pseudoscalar resonant mass for each event selection step in the search for a...
Table 15

Data from Auxiliary Figure 16d

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Acceptance times efficiency as a function of pseudoscalar resonant mass for each event selection step in the search for a...
Table 16

Data from Figure 8a

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Expected and observed 95% CL upper limits on the cross-section of resonant $H\to 4b$ production in association with a W...
Table 17

Data from Figure 8b

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Expected and observed 95% CL upper limits on the cross-section of resonant $H\to 4b$ production in association with a Z...
Table 18

Data from Figure 9a

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Expected 95% CL upper limits on the cross-section of a heavy narrow-width pseudoscalar resonance decaying to a Z boson and...
Table 19

Data from Figure 9b

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Observed 95% CL upper limits on the cross-section of a heavy narrow-width pseudoscalar resonance decaying to a Z boson and...
Table 20

Data from Figure 9c

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Expected 95% CL upper limits on the cross-section of a heavy large-width pseudoscalar resonance decaying to a Z boson and...
Table 21

Data from Figure 9d

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Expected 95% CL upper limits on the cross-section of a heavy large-width pseudoscalar resonance decaying to a Z boson and...
Table 22

Data from Figure 7b

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Data and post-fit signal and background from S+B fit for 315 GeV resonant $H\to 4b$ production in association with a...
Table 23

Data from Auxiliary Figure 8a

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Data and post-fit signal and background from S+B fit for 400 GeV resonant $H\to 4b$ production in association with a...
Table 24

Data from Auxiliary Figure 7a

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Data and post-fit signal and background from S+B fit for 550 GeV resonant $H\to 4b$ production in association with a...
Table 25

Data from Auxiliary Figure 8b

10.17182/hepdata.131626.v1/t25

Data and post-fit signal and background from S+B fit for 400 GeV resonant $H\to 4b$ production in association with a...
Table 26

Data from Auxiliary Figure 7b

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Data and post-fit signal and background from S+B fit for a 790 GeV narrow-width pseudoscalar resonance decaying to a Z...
Table 27

Data from Figure 7c

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Data and post-fit signal and background from S+B fit for a 420 GeV large-width pseudoscalar resonance decaying to a Z...
Table 28

Data from Auxiliary Figure 8c

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Data and post-fit signal and background from S+B fit for a 700 GeV large-width pseudoscalar resonance decaying to a Z...
Table 29

Data from Figure 7a

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Data and post-fit signal and background from S+B fit for SM VHH production, with each Higgs boson decaying to $2b$.

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