Search for Higgs boson pair production in association with a vector boson in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector

The ATLAS collaboration
CERN-EP-2022-159, 2022.

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

    10.17182/hepdata.131626.v1/t1

    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

    10.17182/hepdata.131626.v1/t3

    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

    10.17182/hepdata.131626.v1/t4

    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

    10.17182/hepdata.131626.v1/t5

    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

    10.17182/hepdata.131626.v1/t6

    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

    10.17182/hepdata.131626.v1/t7

    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

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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 10

    Data from Auxiliary Figure 14b

    10.17182/hepdata.131626.v1/t10

    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

    10.17182/hepdata.131626.v1/t11

    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

    10.17182/hepdata.131626.v1/t12

    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

    10.17182/hepdata.131626.v1/t13

    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

    10.17182/hepdata.131626.v1/t17

    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

    10.17182/hepdata.131626.v1/t18

    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

    10.17182/hepdata.131626.v1/t19

    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

    10.17182/hepdata.131626.v1/t20

    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

    10.17182/hepdata.131626.v1/t21

    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

    10.17182/hepdata.131626.v1/t22

    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

    10.17182/hepdata.131626.v1/t23

    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

    10.17182/hepdata.131626.v1/t24

    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

    10.17182/hepdata.131626.v1/t26

    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

    10.17182/hepdata.131626.v1/t27

    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

    10.17182/hepdata.131626.v1/t28

    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

    10.17182/hepdata.131626.v1/t29

    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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