Tests of CPT

TL;DR

This paper reviews experimental tests of CPT symmetry, discusses potential interconnections between different CPT violating parameters, and suggests that violations in various observables are likely smaller than current bounds.

Contribution

It proposes possible links between different CPT violating parameters and interprets experimental bounds in a unified framework.

Findings

CPT symmetry is strongly supported by experimental evidence.

Potential CPT violations in different parameters are interconnected.

Violations in unmeasured parameters are likely smaller than current bounds.

Abstract

The ongoing experimental efforts in the high energy and high precision communities keep providing evidence for CPT, a fundamental symmetry holding in any local Lorentz invariant theory. We suggest possible interconnections between different CPT violating parameters. Specifically, the very precise test of CPT in the $K^0-\bar K^0$ system suggests--though definitely does not imply--that CPT violations in other observable parameters (mass, width, charge, magnetic moments, etc.) are much smaller than the directly measured bounds.