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A search for dark matter is performed using events with large missingtransverse momentum and a Higgs boson decaying either to a pair of bottomquarks or to a pair of photons. The data from proton-proton collisions at acenter-of-mass energy of 13 TeV, collected in 2015 with the CMS detector at theLHC, correspond to an integrated luminosity of 2.3 inverse femtobarns. Resultsare interpreted in the context of a Z'-two-Higgs-doublet model, where the gaugesymmetry of the standard model is extended to a U(1)[Z'] group, with a newmassive Z' gauge boson, and the Higgs sector is extended with four additionalHiggs bosons. In this model, a high-mass resonance Z' decays into apseudoscalar boson A and a light SM-like Higgs boson, and the A decays to apair of dark matter particles. No significant excesses are observed over thebackground prediction. Combining results from the two decay channels yieldsexclusion limits in the signal cross section in the m[Z']-m[A] phase space. Forexample, the observed data exclude the Z' mass range from 600 to 1860 GeV, forZ' coupling strength g[Z'] = 0.8, the coupling of A with dark matter particlesg[chi] = 1, the ratio of the vacuum expectation values tan[beta] = 1, and m[A]= 300 GeV. The results of this analysis are valid for any dark matter particlemass below 100 GeV.

Search for associated production of dark matter with a Higgs boson decaying to b b-bar or gamma-gamma at sqrt(s) = 13 TeV