Speaker
Description
We study the quantum properties of Higgs-boson decays into vector bosons and their sensitivity to new physics, parametrized using an effective extension of the Lagrangian. We simulate four-fermion final states, focusing on the $H\to ZZ^{(*)}$ decay leading to four charged leptons in the final states, and compute quantum observables within the standard model up to next-to-leading order (NLO) accuracy in electroweak couplings. We find that NLO effects can in some specific cases significantly alter the extraction of the parameters controlling the quantum correlations. We investigate these effects in details and we identify the observables that are robust and can be used to extract reliable information. Finally, we analyze which is the effect of new physics on these observables by varying relevant EFT coupling in the $H\to ZZ^{(*)}$ final state.
