The Final Measurement of Epsilon'/Epsilon from KTeV

TL;DR

This paper reports precise measurements of CP and CPT symmetry parameters from KTeV experiment data, including the direct CP violation parameter epsilon'/epsilon, and finds results consistent with previous experiments and CPT symmetry.

Contribution

The paper provides the most accurate measurement of epsilon'/epsilon and related parameters using the full KTeV dataset, confirming previous findings and CPT symmetry.

Findings

Re(epsilon'/epsilon) = (19.2 ± 2.1)×10⁻⁴

Results are consistent with other experiments and CPT symmetry

Measured KL-KS mass difference and KS lifetime

Abstract

We present precise measurements of CP and CPT symmetry based on the full dataset of K to 2pi decays collected by the KTeV experiment at FNAL. We measure the direct CP violation parameter Re(epsilon'/epsilon) = (19.2 pm 2.1)x10-4. We also report the KL-KS mass difference, the KS lifetime, the phase of epsilon, and the phase difference (phi00)-(phi+-). These results are consistent with other experimental results and with CPT symmetry.