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We report a search for Higgs bosons that are produced via vector boson fusionand subsequently decay into invisible particles. The experimental signature isan energetic jet pair with invariant mass of $\mathcal{O}(1) $ TeV and$\mathcal{O}(100) $ GeV missing transverse momentum. The analysis uses 36.1fb$^{-1}$ of $pp$ collision data at $\sqrt{s}=13$ TeV recorded by the ATLASdetector at the LHC. In the signal region the 2252 observed events areconsistent with the background estimation. Assuming a 125 GeV particle withStandard Model cross sections, the upper limit on the branching fraction of theHiggs boson decay into invisible particles is 0.37 at 95% CL where 0.28 wasexpected. This limit is interpreted in Higgs portal models to set limits on theWIMP-nucleon scattering cross section. We also consider invisible decays ofadditional scalar bosons with masses up to 3 TeV for which the upper limits onthe cross section times branching fraction are in the range of $0.3-1.7$ pb.

Search for invisible Higgs boson decays in vector boson fusion at $\sqrt{s} = 13$ TeV with the ATLAS detector