Search for new resonances decaying to a $Z$ boson and a photon in 13.3 fb$^{-1}$ of $pp$ collisions at $\sqrt{s}=13$~TeV with the ATLAS detector

This note presents a search for new resonances decaying to a $Z$ boson and a photon. The $Z$ bosons are identified through their decays to charged, light lepton pairs ($e^+e^-$, $\mu^+\mu^-$). The dataset consists of 13.3 fb$^{-1}$ of $pp$ collisions collected at $\sqrt{s} = 13$~TeV with the ATLAS detector at the Large Hadron Collider during 2015 and 2016. The data are found to be consistent with the expected background in the mass range investigated, and upper limits are set on the production cross section times decay branching ratio to $Z\gamma$ of a narrow scalar boson with mass between 250~GeV and 2.4~TeV.