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In this paper, the collider signature of the heavy Higgs boson at $14$ TeVHL-LHC is studied, where heavy Higgs boson decays into a pair of standard modelHiggs boson, which further decays to $bbZZ$ state and subsequently to$bb\ell^{+} \ell^{-}\nu_{\ell} \nu_{\ell}$ final state. To study this, weconsider singlet scalar extension of the standard model and considered theparameter space and mass of the heavy Higgs such that it prefers the strongfirst order electroweak phase transition. The study is done following the$bbZZ$ analysis of CMS Collaboration and further using parameterized machinelearning for final discrimination which simplifies the training process alongwith an improved discrimination between signal and background over the range ofbenchmark points. Despite the lower branching fractions, this channel can be apotential probe of the electroweak phase transition with the data setscollected by the CMS and ATLAS experiments in the $14$ TeV HL-LHC with $3$$\rm{ab}^{-1}$ of integrated luminosity and a production of resonant di-Higgssignal can be potentially discovered.

Probing Electroweak Phase Transition in Singlet scalar extension of  Standard Model at HL-LHC through $bbZZ$ channel using parameterized machine  learning