Seminarium "High Energy, Cosmology and Astro-particle Physics (HECA)"

The CMS and ATLAS experiments have recently confirmed spin entanglement in top-antitop pairs at high-energy colliders, inspiring further exploration of other processes. This talk addresses the sensitivity of quantum observables in the H->VV process. We study Higgs boson decays into vector bosons in four-lepton final states, calculating quantum observables within the Standard Model up to next-to-leading order (NLO) in electroweak couplings. Our results show that NLO corrections significantly modify quantum correlation patterns relative to tree-level predictions. Additionally, we analyze the effects of potential new physics in both Higgs couplings to four leptons and modifications to the H->VV vertex on quantum observables.