The Final Measurement of Epsilon'/Epsilon from KTeV

TL;DR

This paper reports a precise measurement of direct CP violation in kaon decays, providing key parameters consistent with the Standard Model and CPT symmetry, based on the complete dataset from the KTeV experiment.

Contribution

It presents the final, most precise measurement of epsilon'/epsilon and related parameters, confirming previous results and CPT symmetry with the full KTeV dataset.

Findings

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

Results are consistent with other experiments and CPT symmetry

Provides updated values for KL-KS mass difference and phase parameters

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.