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Search for associated production of a $Z$ boson with an invisibly decaying Higgs boson or dark matter candidates at $\sqrt{s}=13$ TeV with the ATLAS detector

The ATLAS collaboration
CERN-EP-2021-204, 2021.

Abstract
A search for invisible decays of the Higgs boson as well as searches for dark matter candidates, produced together with a leptonically decaying $Z$ boson, are presented. The analysis is performed using proton-proton collisions at a centre-of-mass energy of 13 TeV, delivered by the LHC, corresponding to an integrated luminosity of 139 fb$^{-1}$ and recorded by the ATLAS experiment. Assuming Standard Model cross-sections for $ZH$ production, the upper limit on the branching ratio of the Higgs boson to invisible particles is found to be 19% at the 95% confidence level. Exclusion limits are also set for simplified dark matter models and 2HDM$+a$ models.

  • Table 1

    Data from Figure 4a

    10.17182/hepdata.114363.v1/t1

    The expected exclusion contours as a function of (m(med), m($\chi$)), with Axial-vector mediator)

  • Table 2

    Data from Figure 4a

    10.17182/hepdata.114363.v1/t2

    The observed exclusion contours as a function of (m(med), m($\chi$)), with Axial-vector mediator)

  • Table 3

    Data from Figure 4b

    10.17182/hepdata.114363.v1/t3

    The expected exclusion contours as a function of (m(med), m($\chi$)), with Vector mediator)

  • Table 4

    Data from Figure 4b

    10.17182/hepdata.114363.v1/t4

    The observed exclusion contours as a function of (m(med), m($\chi$)), with Vector mediator)

  • Table 5

    Data from Figure 5a

    10.17182/hepdata.114363.v1/t5

    The expected exclusion contours as a function of (m(a), tan($\beta$)), with sin($\theta$) = 0.35)

  • Table 6

    Data from Figure 5a

    10.17182/hepdata.114363.v1/t6

    The observed exclusion contours as a function of (m(a), tan($\beta$)), with sin($\theta$) = 0.35)

  • Table 7

    Data from Figure 5b

    10.17182/hepdata.114363.v1/t7

    The expected exclusion contours as a function of (m(a), tan($\beta$)), with sin($\theta$) = 0.7)

  • Table 8

    Data from Figure 5b

    10.17182/hepdata.114363.v1/t8

    The observed exclusion contours as a function of (m(a), tan($\beta$)), with sin($\theta$) = 0.7)

  • Table 9

    Data from Figure 5c

    10.17182/hepdata.114363.v1/t9

    The expected exclusion contours as a function of (m(H), tan($\beta$)), with sin($\theta$) = 0.35)

  • Table 10

    Data from Figure 5c

    10.17182/hepdata.114363.v1/t10

    The observed exclusion contours as a function of (m(H), tan($\beta$)), with sin($\theta$) = 0.35)

  • Table 11

    Data from Figure 5d

    10.17182/hepdata.114363.v1/t11

    The expected exclusion contours as a function of (m(H), tan($\beta$)), with sin($\theta$) = 0.7)

  • Table 12

    Data from Figure 5d

    10.17182/hepdata.114363.v1/t12

    The observed exclusion contours as a function of (m(H), tan($\beta$)), with sin($\theta$) = 0.7)

  • Table 13

    Data from Figure 5e

    10.17182/hepdata.114363.v1/t13

    The expected exclusion contours as a function of (m(a), m(H)), with sin($\theta$) = 0.35)

  • Table 14

    Data from Figure 5e

    10.17182/hepdata.114363.v1/t14

    The observed exclusion contours as a function of (m(a), m(H)), with sin($\theta$) = 0.35)

  • Table 15

    Data from Figure 5f

    10.17182/hepdata.114363.v1/t15

    The expected exclusion contours as a function of (m(a), m(H)), with sin($\theta$) = 0.7)

  • Table 16

    Data from Figure 5f

    10.17182/hepdata.114363.v1/t16

    The observed exclusion contours as a function of (m(a), m(H)), with sin($\theta$) = 0.7)

  • Table 17

    Data from Figure 6a

    10.17182/hepdata.114363.v1/t17

    Expected lower limit on signal strength at 95% CL as a function of sin($\theta$), with m(a) = 200 GeV, m(H)...

  • Table 18

    Data from Figure 6a

    10.17182/hepdata.114363.v1/t18

    Observed lower limit on signal strength at 95% CL as a function of sin($\theta$), with m(a) = 200 GeV, m(H)...

  • Table 19

    Data from Figure 6b

    10.17182/hepdata.114363.v1/t19

    Expected lower limit on signal strength at 95% CL as a function of sin($\theta$), with m(a) = 350 GeV, m(H)...

  • Table 20

    Data from Figure 6b

    10.17182/hepdata.114363.v1/t20

    Observed lower limit on signal strength at 95% CL as a function of sin($\theta$), with m(a) = 350 GeV, m(H)...

  • Table 21

    Data from Figure 7

    10.17182/hepdata.114363.v1/t21

    Observed lower limit on WIMP-nucleon cross section at 90% CL as a function of m(WIMP), assuming Higgs-portal scenario with Scalar...

  • Table 22

    Data from Figure 7

    10.17182/hepdata.114363.v1/t22

    Observed lower limit on WIMP-nucleon cross section at 90% CL as a function of m(WIMP), assuming Higgs-portal scenario with Majorana...

  • Table 23

    Data from Figure 8a

    10.17182/hepdata.114363.v1/t23

    Observed lower limit on the spin-dependent WIMP–proton scattering cross-section.

  • Table 24

    Data from Figure 8b

    10.17182/hepdata.114363.v1/t24

    Observed lower limit on the spin-independent WIMP–nucleon scattering cross-section.

  • Table 25

    Data from auxiliary table 3

    10.17182/hepdata.114363.v1/t25

    Cutflow of unweighted and weighted events of $ZH$ signals in the electron channel.

  • Table 26

    Data from auxiliary table 3

    10.17182/hepdata.114363.v1/t26

    Cutflow of unweighted and weighted events of $ZH$ signals in the muon channel.

  • Table 27

    Data from auxiliary table 4

    10.17182/hepdata.114363.v1/t27

    Cutflow of unweighted and weighted events of DM signals (simplified DM axial-vector with m(med) = 900 GeV and m($\chi$) =...

  • Table 28

    Data from auxiliary table 4

    10.17182/hepdata.114363.v1/t28

    Cutflow of unweighted and weighted events of DM signals (simplified DM axial-vector with m(med) = 900 GeV and m($\chi$) =...

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