2010

Precise Measurements of Direct CP Violation, CPT Symmetry, and Other Parameters in the Neutral Kaon System

KTeV Collaboration, Abouzaid, E., Arenton, M. et al.

Understand

We present precise tests of CP and CPT symmetry based on the full dataset of K to pipi decays collected by the KTeV experiment at Fermi National Accelerator Laboratory during 1996, 1997, and 1999.

This dataset contains 16 million K to 2pi0 and 69 million K to pi+pi- decays.
We measure the direct CP violation parameter Re(epsilon'/epsilon) = (19.2 pm 2.1)x10-4.
We find the KL-KS mass difference Deltam = (5270 pm 12)x10^6 hbar/s and the KS lifetime tauS = (89.62 pm 0.05)x10-12 s.

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