  Searches for invisible decays of the Higgs boson are presented. The data
collected with the CMS detector at the LHC correspond to integrated
luminosities of 5.1, 19.7, and 2.3 inverse femtobarns at centre-of-mass
energies of 7, 8, and 13 TeV, respectively. The search channels target Higgs
boson production via gluon fusion, vector boson fusion, and in association with
a vector boson. Upper limits are placed on the branching fraction of the Higgs
boson decay to invisible particles, as a function of the assumed production
cross sections. The combination of all channels, assuming standard model
production, yields an observed (expected) upper limit on the invisible
branching fraction of 0.24 (0.23) at the 95% confidence level. The results are
also interpreted in the context of Higgs-portal dark matter models.
