Combination of diboson resonance searches at 8 and 13 TeV

The statistical combination of searches for massive resonances decaying to pairs of W, Z, and Higgs bosons based on pp collision data collected by the CMS experiment at the CERN LHC is presented. The data are taken at a centre-of-mass energy of 8 and 13 TeV and correspond to an integrated luminosity of 19.7fb$^{-1}$ and 2.6$^{-1}$ respectively. The results are interpreted in the context of a heavy vector triplet model that mimics the properties of composite Higgs models predicting a W' and a Z' decaying to WZ, WH, WW, and ZH and a model with a "bulk" graviton that decays into WW and ZZ. Combined cross section limits as a function of resonance mass are obtained. The combined significance of potential resonances of 1.8--2 TeV are evaluated in each signal hypothesis.