Search for a CP asymmetry in Cabibbo-suppressed D0 decays

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.