Abstract
The phases of the CP-violating amplitudes in K0→π+π− and K0→2π0 decays, φ+−=46.9°±2.2° and φ00=47.1°±2.8°, have been measured in the same experiment, and a direct comparison gives the phase difference φ00−φ+−=0.2°±2.9°. This result leads to an upper limit on possible CPT violation in the K0 mass matrix, of |(mK0−mK0)/mK0|<5×10−18 at the 95% confidence level and is the most stringent test of the equality of particle and antiparticle masses.
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