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Combination of searches for invisible Higgs boson decays with the ATLAS experiment
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abstract
Dark matter particles, if sufficiently light, may be produced in decays of the Higgs boson. This Letter presents a statistical combination of searches for $H\to\textrm{invisible}$ decays where $H$ is produced according to the Standard Model via vector boson fusion, $Z(\ell\ell)H$, and $W\!/\!Z(\textrm{had})H$, all performed with the ATLAS detector using 36.1 fb$^{-1}$ of $pp$ collisions at a center-of-mass energy of $\sqrt s = 13$ TeV at the LHC. In combination with the results at $\sqrt s = 7$ and 8 TeV, an exclusion limit on the $H\to\textrm{invisible}$ branching ratio of $0.26 (0.17^{+0.07}_{-0.05})$ at 95% confidence level is observed (expected).
Forward citations
Cited by 7 Pith papers
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Two-real-scalar-singlet extension of the SM: LHC phenomenology and benchmark scenarios
The two-real-singlet extension of the Standard Model can produce sizable rates for asymmetric and cascade Higgs-to-Higgs decays at the LHC, and the paper supplies six benchmark planes for those signatures.
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Search for the production of dark Higgs in the framework of Mono-Z$^{\prime}$ portal at the FCC-ee simulated electron-positron collisions at $\sqrt{s} = 240$ GeV
Upper limits at 95% CL are placed on the mass of the dark Higgs boson in the Mono-Z' portal model from simulated FCC-ee data at 240 GeV center-of-mass energy.
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Two-Component Dark Matter with an SU(2) Dark Sector
A hidden SU(2) gauge sector that breaks to a Z3-protected two-component dark matter scenario is shown to have parameter points satisfying existing constraints.
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Search for light long-lived neutral particles produced in $pp$ collisions at $\sqrt{s} =$ 13 TeV and decaying into collimated leptons or light hadrons with the ATLAS detector
No evidence for displaced dark-photon jets is found, and 95% confidence limits exclude cross sections above about 4 pb for H to two dark photons with decay lengths from 1.5 mm to 307 mm.
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Electroweak Breaking and Higgs Boson Profile in the Simplest Linear Seesaw Model
In the simplest linear seesaw model, astrophysical, unitarity, and LHC constraints force a compressed scalar spectrum and permit the 125 GeV Higgs to decay invisibly into majorons with branching ratios up to about 20%.
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Constraining new physics from Higgs measurements with Lilith: update to LHC Run 2 results
Lilith-2.0 updates the Higgs signal-strength likelihood tool to ATLAS and CMS Run 2 data, adding variable Gaussian and Poisson likelihoods, arbitrary-dimensional correlations, and new global coupling fits.
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Sterile Neutrino as an Asymmetric Dark Matter
A model for asymmetric freeze-in production of Dirac sterile neutrino dark matter is proposed, but the relic density calculation ignores the symmetric component and assumes an equilibrium mediator abundance.
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