Quantum properties of $H\to VV^*$: precise predictions in the SM and sensitivity to new physics

• URL: http://arxiv.org/abs/2504.03841v1
• Date: Fri, 04 Apr 2025 18:00:04 GMT
• Title: Quantum properties of $H\to VV^*$: precise predictions in the SM and sensitivity to new physics
• Authors: Morgan Del Gratta, Federica Fabbri, Priyanka Lamba, Fabio Maltoni, Davide Pagani,
• Abstract summary: We study the quantum properties of the Higgs-boson decays into four fermions via two vector bosons $(Hto VV*to 4f)$.<n>In particular, we focus on the case of two different-flavour lepton pairs $(Hto ZZ*to mu+mu- e+ e+ e-)$.<n>We compute the quantum-information observables for the corresponding two-qutrit system $(ZZ)$ at next-to-leading order electroweak (NLO EW) accuracy
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We study the quantum properties of the Higgs-boson decays into four fermions via two vector bosons $(H\to VV^*\to 4f)$. In particular, we focus on the case of two different-flavour lepton pairs $(H\to ZZ^*\to \mu^+\mu^- e^+ e^-)$. 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 and significantly alter the extraction of the observables quantifying the quantum correlations. We identify the 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.

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