# Test of discrete symmetries in transitions with entangled neutral kaons at KLOE-2

## TL;DR

The paper discusses tests of discrete symmetries, including CPT and Time reversal, using entangled neutral kaon pairs produced at the KLOE-2 experiment, aiming to detect potential signals of New Physics.

## Contribution

It reports on the status of symmetry tests with entangled neutral kaons at KLOE-2, utilizing upgraded detector capabilities and extensive data collection.

## Key findings

- Preliminary results on CPT symmetry tests.
- Constraints on Time reversal symmetry violations.
- Enhanced sensitivity due to improved experimental setup.

## Abstract

The KLOE-2 experiment at the INFN Laboratori Nazionali di Frascati (LNF) completed its data-taking at the $e^+ e^-$ DA$\Phi$NE collider, which implements an innovative collision scheme based on a crab-waist configuration, and achieved the integrated luminosity of more than 5 fb$^-1$. KLOE-2 represents the continuation of KLOE with an upgraded detector and an extended physics program which includes, among the main topics, neutral kaon interferometry and test of discrete symmetries . Entangled neutral kaon pairs produced at DA$\Phi$NE are a unique tool to test discrete symmetries and quantum coherence at the utmost sensitivity, strongly motivating the experimental searches of possible CPT violating effects, which would constitute an unambiguous signal of New Physics. The status of the test of Time reversal and CPT simmetry in $\phi \to \mbox{K}_S \mbox{K}_L \to \pi\nu,3\pi^0,(2\pi)$ decays with KLOE and KLOE-2 data will be discussed.