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A search for massive resonances decaying to a Z boson and a photon isperformed in events with a hadronically decaying Z boson candidate, separatelyin light-quark and b quark decay modes, identified using jet substructure andadvanced b tagging techniques. Results are based on samples of proton-protoncollisions collected with the CMS detector at the LHC at center-of-massenergies of 8 and 13 TeV, corresponding to integrated luminosities of 19.7 and2.7 inverse femtobarns, respectively. The results of the search are combinedwith those of a similar search in the leptonic decay modes of the Z boson,based on the same data sets. Spin-0 resonances with various widths and withmasses in a range between 0.2 and 3.0 TeV are considered. No significant excessis observed either in the individual analyses or the combination. The resultsare presented in terms of upper limits on the production cross section of suchresonances and constitute the most stringent limits to date for a wide range ofmasses.

Search for high-mass Z gamma resonances in proton-proton collisions at sqrt(s) = 8 and 13 TeV using jet substructure techniques