The Final Measurement of ǫ′/ǫ from KTeV

We present precise measurements of CP and CPT symmetry based on the full dataset of K → ππ decays collected by the KTeV experiment at FNAL. We measure the direct CP violation parameterRe(ǫ/ǫ) = (19.2 ±2.1) × 10. We find the KL-KS mass difference ∆m = (5265 ± 10)×10 6 h̄s and the KS lifetime τS = (89.62 ± 0.05)×10 s. We test CPT symmetry by finding the phase of the indirect CP violation parameter ǫ, φǫ = (44.09 ± 1.00), and the difference of the relative phases between the CP violating and CP conserving decay amplitudes for K → ππ (φ+−) and for K → ππ (φ00), ∆φ = (0.29 ± 0.31). These results are consistent with other experimental results and with CPT symmetry.