Search for heavy resonances decaying into a pair of Z bosons using 139 fb$^{−1}$ of proton-proton collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector

A search for heavy resonances decaying into a pair of Z bosons is presented. The search uses proton-proton collision data at a centre-of mass energy of 13 TeV collected from 2015 to 2018 that corresponds to an integrated luminosity of 139 fb$^{−1}$ which is the full data statistics collected by the ATLAS detector during the Run 2 of the Large Hadron Collider (LHC). Different mass ranges for the hypothetical resonances are considered spanning from 200 GeV to 2000 GeV. In the absence of a significant observed excess, the results are interpreted as upper limits on the production cross section of a spin-0 or spin-2 resonance. The upper limits for the spin-0 resonance are translated to exclusion contours in the context of Type-I and Type-II twoHiggs-doublet models (2HDM), while those for the spin-2 resonance are used to constrain the Randall-Sundrum (RS) model with an extra dimension giving rise to spin-2 graviton excitations.