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We report an improved measurement of D0–D‾0 mixing and a search for CP violation in D0 decays to CP-even final states K+K− and π+π−. The measurement is based on the final Belle data sample of 976 fb−1. The results are yCP=(1.11±0.22±0.09)% and AΓ=(−0.03±0.20±0.07)%, where the first uncertainty is statistical and the second is systematic.
We measure the CP-violating asymmetries in decays to the D0→K+K− and D0→π+π− CP eigenstates using 540 fb −1 of data collected with the Belle detector at or near the ϒ(4S) resonance. Cabibbo-favored D0→K−π+ decays are used to correct for systematic detector effects. The results, ACPKK=(−0.43±0.30±0.11)% and ACPππ=(+0.43±0.52±0.12)%, are consistent with no CP violation.
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