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() and Im(δ) based on the unitarity condition (Bell-Steinberger relation) and on recent results from the KLOE experiment. We find Re() = (159.6±1.3) × 10−5 and Im(δ) = (0.4±2.1) × 10−5, consistent with no CPT violation.