CPT and Quantum Mechanics Tests with Kaons

TL;DR

This review discusses theoretical motivations for CPT violation and quantum mechanics deviations, and reviews precision tests using neutral and charged kaons, highlighting the role of meson factories in probing fundamental symmetries.

Contribution

It provides a comprehensive overview of CPT and quantum mechanics tests with kaons, emphasizing the potential for neutral meson factories to explore models with non-standard CPT operators.

Findings

Neutral kaon experiments test CPT violation.

Charged kaon decays offer high-statistics symmetry tests.

Meson factories uniquely probe non-standard CPT models.

Abstract

In this review we first discuss the theoretical motivations for possible CPT violation and deviations from ordinary quantum-mechanical behavior of field-theoretic systems in the context of an extended class of quantum-gravity models. Then we proceed to a description of precision tests of CPT symmetry using mainly neutral kaons. We emphasize the possibly unique role of neutral meson factories in providing specific tests of models where the quantum-mechanical CPT operator is not well-defined, leading to modifications of Einstein-Podolsky-Rosen particle correlators. Finally, we present tests of CPT, T, and CP using charged kaons, and in particular K_l4 decays, which are interesting due to the high statistics attainable in experiments.