# EPS-HEP2021 conference

26-30 July 2021
Zoom
Europe/Berlin timezone

## Tests of CPT symmetry and quantum coherence with entangled neutral kaons at KLOE-2

Not scheduled
20m
Zoom

#### Zoom

Poster Flavour Physics and CP Violation

### Speaker

Riccardo D'Amico (Sapienza University of Rome & INFN ROME)

### Description

In March 2018 the KLOE-2 experiment finished data taking at the upgraded e+e- DAΦNE collider of the INFN Laboratori Nazionali di Frascati. The combined data sample collected by KLOE and KLOE-2 amounts to almost 8 fb$^{-1}$ integrated luminosity and it is the largest existing data sample in the world collected at an e+e- collider at the ϕ meson peak, corresponding to ~2.4 $\times$ 10$^{10}$ ϕ mesons produced.

The entanglement in the neutral kaon pairs produced at the DAΦNE ϕ-factory is a unique tool to test discrete symmetries and quantum coherence at the utmost sensitivity, in particular strongly motivating the experimental searches of possible CPT violating effects, which would unambiguously signal New Physics.

We will present the final result of measurement of the decoherence and CPT violation parameters in $K_SK_L\to\pi^+\pi^-\pi^+\pi^-$ with an improved accuracy with an improved statistical accuracy of a factor ~2 with respect to literature. Additionally updates on the first direct test of CPT and T symmetries in neutral kaon transitions will be presented.

Collaboration / Activity KLOE-2

### Primary authors

Dr Eryk Czerwiński (Institute of Physics, Jagiellonian University, Poland) Riccardo D'Amico (Sapienza University of Rome & INFN ROME)