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

Collaboration, ATLAS
(2019) Search for invisible Higgs boson decays in vector boson fusion at $\sqrt{s} = 13$ TeV with the ATLAS detector. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics.

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## Abstract

We report a search for Higgs bosons that are produced via vector boson fusion and subsequently decay into invisible particles. The experimental signature is two energetic jets with $\mathcal{O}(1)$ TeV invariant mass and $\mathcal{O}(100)$ GeV missing transverse momentum. The analysis uses 36.1 fb$^{-1}$ of $pp$ collision data at 13 TeV recorded by the ATLAS detector at the LHC. In the signal region the 2252 observed events are consistent with the background estimation. Assuming a 125 GeV particle with Standard Model cross sections, the upper limit on the branching fraction of the Higgs boson decay into invisible particles is 0.37 at 95% CL where 0.28 was expected. This limit is interpreted in Higgs portal models to set limits on the WIMP-nucleon scattering cross section. We also consider invisible decays of additional scalar bosons with masses up to 3 TeV for which the upper limits on the cross section times branching fraction are in the range of $0.3-2.0$ pb.

Item Type: Article 40 pages in total, author list starting page 23, 6 figures, 2 tables, submitted to Physics Letters B. All figures including auxiliary figures are available at https://cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2016-37 hep-ex, hep-ex Symplectic Admin 09 May 2019 10:27 06 May 2021 10:06 10.1016/j.physletb.2019.04.024 https://doi.org/10.1016/j.physletb.2019.04.024 https://livrepository.liverpool.ac.uk/id/eprint/3040419