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 observed (expected) upper limit on the branching ratio of the Higgs boson to invisible particles is found to be 19% (19%) at the 95% confidence level. Exclusion limits are also set for simplified dark matter models and two-Higgs-doublet models with an additional pseudoscalar mediator.

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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