Searches for heavy ZZ and ZW resonances in the llqq and vvqq final states in pp collisions at sqrt(s) = 13 TeV with the ATLAS detector

This note reports searches for heavy resonances decaying into a Z Z or ZW pair using proton-proton collision data at a centre-of-mass energy of sqrt(s) = 13 GeV. The data were recorded with the ATLAS detector in 2015 and 2016 at the Large Hadron Collider, corresponding to a total integrated luminosity of 13.2 fb^{-1}. The searches are performed in final states in which one Z boson decays to either a pair of light charged leptons (electrons and muons) or a pair of neutrinos, and the associated W boson or the other Z boson decays hadronically. The data are found to be in good agreements with the background expectations and no evidence for the production of heavy resonances is observed. Upper bounds on the production cross sections times their decay branching ratios to ZZ or ZW pairs are derived for heavy resonances in the mass range of 300 - 5000 GeV, within the context of Standard Model extensions with an extended Higgs sector, a heavy vector triplet and warped extra dimensions.