Comments on CPT tests

TL;DR

This paper reviews current knowledge on CPT symmetry, highlighting that direct measurements limit CPT violation to about 30% of CP violation and proposing improved theoretical and experimental tests.

Contribution

It introduces a new approach for testing CPT symmetry by comparing theoretical predictions with experimental measurements of eta phases.

Findings

CPT violation is limited to about 30% of CP violation

Theoretical predictions for eta phases are crucial for CPT tests

Proposed new experimental test for CPT symmetry

Abstract

What do we know about CPT symmetry? We conclude that the direcrt measurement of CPT violation leads to a result that CPT violation force is limited to about 30% of CP violating forces. The best test of CPT symmetry is to see if theoretical prediction for the phase of eta_{+-} and eta_{00} agree with experiments. We discuss uncertainties associated with this prediction, and how to improve it. A new test of CPT is also discussed.