Determination of CP and CPT violation parameters in the neutral kaon   system using the Bell-Steinberger relation and data from the KLOE experiment
  We present an improved determination of the CP and CPT violation parameters Re(epsilon) and Im(delta) based on the unitarity condition (Bell-Steinberger relation) and on recent results from the KLOE experiment. We find Re(epsilon) = (159.6 \pm 1.3)10^-5 and Im(delta) = (0.4 \pm 2.1)10^-5, consistent with no CPT violation. 
The KLOE Collaboration: G. D'Ambrosio and G. Isidori