Search for heavy resonances decaying into a pair of <it>Z</it> bosons in the <mml:msup>l+</mml:msup><mml:msup>l-</mml:msup><mml:msup>l '+</mml:msup><mml:msup>l '-</mml:msup> and <mml:msup>l+</mml:msup><mml:msup>l-</mml:msup>nu nu<overbar></mml:mover> final states using 139 <mml:msup>fb-1</mml:msup> of proton-proton collisions at <mml:msqrt>s</mml:msqrt><mml:mo>=13<mml:mspace width="0.166667em"></mml:mspace>TeV with the ATLAS detector
Abstract
A search for heavy resonances decaying into a pair of Z bosons leading to l+l-l ' +l '- and l+l-nu nu final states, where l stands for either an electron or a muon, 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 the integrated luminosity of 139 fb-1 recorded by the ATLAS detector during Run 2 of the Large Hadron Collider.
Different mass ranges spanning 200 GeV to 2000 GeV for the hypothetical resonances are considered, depending on the final state and model. 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 two-Higgs-doublet models, and the limits for the spin-2 resonance are used to constrain the Randall-Sundrum model with an extra dimension giving rise to spin-2 graviton excitations.