Search for a $HH$ production in the $b \bar{b} ZZ(4l)$ final state at $\sqrt{s} = 13$TeV with full Run II data

A search for resonant and non-resonant double Higgs boson production at the LHC with the CMS experiment is presented. The extension of the HEFT theory for the non-resonant HH production and Kaluza-Klein Bulk Graviton with spin-2 and Radion with spin-0 are the resonances responsible for the Higgs (H) pair production. For both cases, one of the Higgs boson will be studied into a leptonic final state (𝐻 → 𝑍𝑍 (4𝑙), where, 𝑙 = 𝑒, 𝜇), meanwhile the other one decays into a pair of 𝑏-quarks ($b \bar{b}$). The analyzed data corresponds to an integrated luminosity of 137.2𝑓𝑏$^{−1}$ of 𝑝𝑝-collision at a center-of-mass-energy of $\sqrt{s}$ = 13 TeV collected with the CMS detector during the full RunII period. Advanced statistical techniques are employed to extract the results. Upper limits are set on the signal strength modifier 𝜇, defined as the double-Higgs boson rate in the $b \bar{b}$4𝑙 channel to the Standard Model (SM) expectation.