Search for invisible decays of a Higgs boson using vector-boson fusion in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

Abstract

A search for a Higgs boson produced via vector-boson fusion and decaying into invisible particles is presented, using 20.3 fb${}^{-1}$ of proton--proton collision data at a centre-of-mass energy of 8 TeV recorded by the ATLAS detector at the LHC. For a Higgs boson with a mass of 125 GeV, assuming the Standard Model production cross section, an upper bound of 0.28 is set on the branching fraction of $H\to$ invisible at 95% confidence level, where the expected upper limit is 0.31. The results are interpreted in models of Higgs-portal dark matter where the branching fraction limit is converted into upper bounds on the dark-matter--nucleon scattering cross section as a function of the dark-matter particle mass, and compared to results from the direct dark-matter detection experiments.

27 pages plus author list (43 pages total), 8 figures, 11 tables, published version, all figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2013-16/

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• Dirac Neutrinos and Dark Matter Stability from Lepton Quarticity
• Constraints on mediator-based dark matter and scalar dark energy models using $\sqrt{s}=13$ TeV $pp$ collision data collected by the ATLAS detector
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• Minimal Vector-like leptonic Dark Matter and Signatures at the LHC
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• NNLO QCD corrections to weak boson fusion Higgs boson production in the $H\to b\bar{b}$ and $H\to W{W}^{\ast }\to 4l$ decay channels
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• Boosting the $H\to$ invisibles searches with $Z$ boson polarization
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• Visible and Ultraviolet Laser Spectroscopy of ThF
• Dark Matter from a Vector Field in the Fundamental Representation of $SU(2{)}_L$
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• Search strategies for pair production of heavy Higgs bosons decaying invisibly at the LHC
• Vector Bosons and Jets in Proton Collisions
• Prospects for Detecting light bosons at the FCC-ee and CEPC
• Effective Theory for Electroweak Doublet Dark Matter
• Radiative Light Dark Matter
• An i2HDM Strongly Coupled to a non-Abelian Vector Resonance
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• KeV scale new fermion from a hidden sector
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• The Forward Physics Facility at the High-Luminosity LHC
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