# Testing CPT violation with correlated neutral mesons

## TL;DR

This paper reviews how neutral meson experiments can test CPT violation within the Standard-Model Extension, focusing on phenomenology, formalism comparison, and experimental strategies, including implications for the Belle II experiment.

## Contribution

It provides a comprehensive overview of CPT violation phenomenology in neutral mesons, comparing formalism across experiments and analyzing experimental prospects, especially for Belle II.

## Key findings

- Comparison of notations and formalism across experiments
- Analysis of momentum-dependent CPT violation asymmetries
- Implications for decoherence and direction dependence in meson pairs

## Abstract

This work gives a general overview of phenomenology developed for neutral-meson searches for CPT violation in the framework of the Standard-Model Extension with focus on meson factories. It gives a comparison of notations and fundamental approach in the formalism used by the different experiments. Asymmetries and possible experimental investigations are presented for tests of the momentum-dependent phenomenological parameter of CPT violation in neutral-meson oscillations. The general results apply to any mesons produced as correlated meson pairs and addresses the issue of decoherence as a consequence of direction dependence. An analysis is given considering kinematics and orientation of the improved Belle II experiment.