Tests of discrete symmetries and quantum coherence with neutral kaons at the KLOE-2 experiment

TL;DR

This paper reports on tests of fundamental symmetries and quantum coherence using entangled neutral kaons at the KLOE-2 experiment, including searches for Lorentz invariance violation, CPT violation, and T symmetry, with ongoing data collection.

Contribution

It presents new experimental results on symmetry violations and quantum coherence in neutral kaons, utilizing the unique entangled system at KLOE-2, and discusses future perspectives.

Findings

Limits on Lorentz invariance violation and CPT violation established.

Quantum coherence tests with neutral kaons conducted and analyzed.

Ongoing and future symmetry tests with increased data are discussed.

Abstract

The KLOE-2 detector records decays of quantum-entangled pairs of neutral kaons produced in decays of phi mesons provided by the DAFNE accelerator at the Laboratori Nazionali di Frascati, Italy. This system allows for a broad range of studies of fundamental discrete symmetries including tests which are only feasible with entangled neutral mesons. This work reports on the Lorentz non-invariance and CPT violation searches with the KSKL->pi+pi-pi+pi- process in the framework of the Standard Model Extension. Moreover, status and results of quantum coherence tests with the same process are discussed. Finally, the status of ongoing direct tests of T and CPT in neutral kaon transitions is presented. For each of thereported studies, perspectives are discussed for the KLOE-2 experiment, which is presently taking data.