Aaboud, M.Aad, G.Abbott, B.Abbott, D.C.Abdinov, O.Abed Abud, A.Abhayasinghe, D.K.Abidi, S.H.Abouzeid, O.S.Abraham, N.L.Abramowicz, H.Abreu, H.Abulaiti, Y.Acharya, B.S.Adachi, S.Adam, L.Adam Bourdarios, C.Adamczyk, L.Adamek, L.Adelman, J.et al.2020-04-022020-04-022019Physical Review Letters, 2019; 122(23):231801-1-231801-200031-90071079-7114http://hdl.handle.net/2440/124017Dark matter particles, if sufficiently light, may be produced in decays of the Higgs boson. This Letter presents a statistical combination of searches for H→invisible decays where H is produced according to the standard model via vector boson fusion, Z(ℓℓ)H, and W/Z(had)H, all performed with the ATLAS detector using 36.1  fb⁻¹ of pp collisions at a center-of-mass energy of √ = 13  TeV at the LHC. In combination with the results at √ = 7 and 8 TeV, an exclusion limit on the H→invisible branching ratio of 0.26{0.17-₀.₀₅⁺⁰·⁰⁷) at 95% confidence level is observed (expected).en© 2019 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.ATLAS CollaborationJournal article003012043210.1103/PhysRevLett.122.2318010004719886000032-s2.0-85067675453468275Jackson, P. [0000-0002-0847-402X]Oliver, J. [0000-0002-0713-6627]White, M. [0000-0001-5474-4580]