Search for a new scalar resonance decaying to a pair of Z bosons at the High-Luminosity LHC

For a heavy resonance decaying into a pair of Z bosons, a projection of current CMS searches to the HL-LHC is presented. The study considers pp collisions for an integrated luminosity of 3000 $\mathrm{fb}^{-1}$ and takes into account the Phase-2 upgrade of the CMS detector. The final state with two leptons and two quarks is used to search for heavy resonances in the mass range from 550 GeV to 3 TeV. The scalar particle X is assumed to have a decay width much narrower than the detector resolution. Upper limits on the cross sections for models predicting the production of this scalar resonance through gluon fusion and electroweak mechanisms are presented.