Quantum properties of $H\to V{V}^{\ast }$: precise predictions in the SM and sensitivity to new physics

Abstract

We study the quantum properties of the Higgs-boson decays into four fermions via two vector bosons $(H\to V{V}^{\ast }\to 4f)$. In particular, we focus on the case of two different-flavour lepton pairs $(H\to Z{Z}^{\ast }\to {\mu }^{+}{\mu }^{-}{e}^{+}{e}^{-})$. We compute the quantum-information observables for the corresponding two-qutrit system $(ZZ)$ at next-to-leading order electroweak (NLO EW) accuracy in the SM. We find that NLO EW corrections lead to giant (order 1) effects in some specific cases, significantly altering the extraction of observables quantifying the quantum correlations. We identify observables that are robust and can be used to extract reliable information. Finally, we discuss possible new physics (NP) effects, parametrised via an effective-field-theory approach. We show how quantum observables can increase the sensitivity to NP also for the process considered in this study.

76 pages, 14 figures, 18 tables

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Cited by in corpus (7)

• Higher-Order Corrections to Quantum Observables in $h\to W{W}^{\ast }$
• Quantum Entanglement is Quantum: ZZ Production at the LHC
• Polarized-boson pairs at NLO in the SMEFT
• Qubit entanglement from forward scattering
• Optimal estimation of Higgs-Gauge Boson couplings at the future $e^{+}{e}^{-}$ colliders
• Colliders are not Testing Locality via Bell's Inequality nor Providing an Unconditional Proof of Entanglement
• Parameter Inference from Final-State Entanglement in Higgs Decays