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 collaboration
Phys.Lett.B 829 (2022) 137066, 2022.

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

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

• Table 2

Data from Figure 4a

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

• Table 3

Data from Figure 4b

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

• Table 4

Data from Figure 4b

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

• Table 5

Data from Figure 5a

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

• Table 6

Data from Figure 5a

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

• Table 7

Data from Figure 5b

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

• Table 8

Data from Figure 5b

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

• Table 9

Data from Figure 5c

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

• Table 10

Data from Figure 5c

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

• Table 11

Data from Figure 5d

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

• Table 12

Data from Figure 5d

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

• Table 13

Data from Figure 5e

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

• Table 14

Data from Figure 5e

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

• Table 15

Data from Figure 5f

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

• Table 16

Data from Figure 5f

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

• Table 17

Data from Figure 6a

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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

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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

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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

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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

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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

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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

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

• Table 24

Data from Figure 8b

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

• Table 25

Data from auxiliary table 3

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

• Table 26

Data from auxiliary table 3

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

• Table 27

Data from auxiliary table 4

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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

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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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