Entanglement, fluctuations and discrete symmetries in particle decays

TL;DR

This paper investigates quantum entanglement and CP distribution moments in pairs of neutral mesons from particle decays, using density operators and experimental data to understand their quantum correlations and symmetries.

Contribution

It introduces a density operator framework to analyze time-dependent entanglement in meson pairs and links measurable CP moments to initial entanglement levels.

Findings

Entanglement entropy varies with decay time and initial conditions.

CP distribution moments are highly sensitive to initial entanglement.

Experimental data from KLOE and Belle support the theoretical framework.

Abstract

Pairs of pseudoscalar neutral mesons from decays of vector resonances are studied as bipartite systems in the framework of density operator. Time-dependent quantum entanglement is quantified in terms of the entanglement entropy and these dependences are demonstrated on data on correlated pairs of K and B mesons, as measured by the KLOE and Belle experiments . Another interesting characteristics of such bipartite systems are moments of the CP distributions. These moments are directly measurable and they appear to be very sensitive to the initial degree of entanglement of a pair.