Search for ZZ Resonances in the Final State of Leptons and Neutrinos in Proton-Proton Collisions at 13 TeV

A search for heavy resonances decaying to a pair of Z bosons is performed using data collected with the CMS detector at the LHC. Events are selected by requiring two oppositely charged leptons (electrons or muons), consistent with the decay of a Z boson, and large missing transverse momentum, which is interpreted as arising from the decay of a second Z boson to two neutrinos. The analysis uses data from proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 /fb. The hypothesis of a spin-2 bulk graviton decaying to a pair of Z bosons is examined for 600 ≤ m ≤ 2500 GeV and upper limits at 95% confidence level are set on the product of the production cross section and branching fraction of X→ZZ ranging from 100 to 4 fb. For bulk graviton models characterized by a curvature scale parameter k ̃ = 0.5 in the extra dimension, the region m < 800 GeV is excluded, providing the most stringent limit reported to date. Variations of the model considering the possibility of a wide resonance produced exclusively via gluon–gluon fusion or qq annihilation are also examined.