CPT Tests in the Neutral Kaon System by FNAL E773

TL;DR

This paper reports measurements of CP violation parameters and tests CPT symmetry in neutral kaon decays, finding no evidence of CPT violation and providing precise values for mass difference and lifetime.

Contribution

First measurements of CP violating phases in neutral kaon decays that test CPT symmetry with high precision.

Findings

No evidence for CPT violation in the measured phases.

Precise values for mass difference and lifetime of neutral kaons.

Confirmation of CP violation parameters consistent with previous results.

Abstract

The FNAL experiment E773 has measured the phases Phi_{+-} = (43.35 +- 0.70 +- 0.79) degree and Phi_{00}-Phi_{+-} = (0.67 +- 0.85 +- 1.1) degree of the CP violating parameters eta_{+-} and eta_{00} in the decay of neutral kaons into two charged or neutral pions. These preliminary results test CPT symmetry and show no evidence for a violation. In addition we present a preliminary measurement of Delta m = m_L - m_S = (0.5286 +- 0.0029 +- 0.0022)*E+10 hbar/sec and tau_S = (0.8929 +- 0.0014 +- 0.0014)*E-10 sec. The first errors are statistical and the second errors are systematic for above results.