Combination of Searches for Higgs Boson Pair Production in Proton-Proton Collisions at root s=13 TeV

This Letter describes a search for Higgs boson pair production using the combined results from four final states: (bb\gamma \gamma ), (bb\tau \tau ), (bbbb), and (bbVV), where (V) represents a (W) or (Z) boson. The search is performed using data collected in 2016 by the CMS experiment from LHC proton-proton collisions at (\sqrt{s}=13\text{}\text{}\mathrm{TeV}), corresponding to an integrated luminosity of (35.9\text{}\text{}{\mathrm{fb}}^{-1}). Limits are set on the Higgs boson pair production cross section. A 95% confidence level observed (expected) upper limit on the nonresonant production cross section is set at 22.2 (12.8) times the standard model value. A search for narrow resonances decaying to Higgs boson pairs is also performed in the mass range 250–3000 GeV. No evidence for a signal is observed, and upper limits are set on the resonance production cross section.