Sirunyan, A. M.Sanders, Stephen J.CMS Collaboration2021-01-282021-01-282019-03-29A. M. Sirunyan et al., "Combination of Searches for Higgs Boson Pair Production in Proton-Proton Collisions at √s = 13 TeV", Phys. Rev. Lett. 122, 121803, 29 March 2019, American Physical Society, https://doi.org/10.1103/PhysRevLett.122.121803,https://hdl.handle.net/1808/31292This work is licensed under a Creative Commons Attribution 4.0 International License.This Letter describes a search for Higgs boson pair production using the combined results from four final states: bbγγ, bbττ, 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 √s=13 TeV, corresponding to an integrated luminosity of 35.9fb−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.© 2019 CERN, for the CMS Collaboration.http://creativecommons.org/licenses/by/4.0/Article10.1103/PhysRevLett.122.121803openAccess