Recent results on entangled neutral kaons at KLOE-2

About

The entanglement of $K^0\bar{K^0}$ pairs produced in $\phi$-meson decays, in combination

with the unique properties of the neutral kaon system – such as flavour oscillations, charge-parity (CP)

and time-reversal (T ) violation – opens up new horizons in testing the basic principles

of quantum mechanics and its fundamental discrete symmetries T , CP, CPT.

The KLOE and KLOE-2 experiments at the Frascati Laboratories of INFN

collected at the DA$\Phi$NE collider an integrated luminosity of about 8 fb$^{-1}$,

corresponding to $\simeq 8 \times 10^{9}$ $K_SK_L$ entangled pairs produced.

This is the world largest available data sample of this kind

and represents a unique tool to improve the precision on these studies.

The seminar will illustrate the most recent KLOE-2 results, including:

(i) an improved search for decoherence and CPT violation effects that exploits EPR correlations

in the process $\phi\rightarrow K_S K_L \rightarrow\pi^+\pi^-\pi^+\pi^-$, and constraints