23-25 November 2022
Europe/Madrid timezone

Testing entanglement and Bell Inequalities in H --> ZZ.

23 Nov 2022, 18:30


Facultad de Ciencia y Tecnología (UPV/EHU)
Física Teórica Física Teórica


Alexander Bernal González (IFT UAM-CSIC)


We discuss quantum entanglement and violation of Bell inequalities in the H --> ZZ decay, in particular when the two Z-bosons decay into light leptons. Although such process implies an important suppression of the statistics, this is traded by clean signals from a "quasi maximally-entangled" system, which makes it very promising to check these crucial phenomena at high energy. We devise a novel framework to extract from H --> ZZ data all significant information related to this goal, in particular spin correlation observables. In this context, we derive sufficient and necessary conditions for entanglement in terms of only two parameters. Likewise, we obtain a sufficient and improved condition for the violation of Bell-type inequalities. The numerical analysis shows that with a luminosity of L = 300 fb^{-1} entanglement can be probed at > 3σ level. For L = 3 ab^{-1} (HL-LHC), entanglement can be probed beyond the 5σ level, while the sensitivity to a violation of the Bell inequalities is at the 4.5σ level.

Primary author

Alexander Bernal González (IFT UAM-CSIC)

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