Abstract
The present paper reports on the evidence for D0-D̄0 mixing. We searched for mixing in two processes using 540 fb-1 of data recorded by the Belle detector at the KEKB e+e− collider. In the first case, we measured the apparent lifetime for D0 meson decaying to CP eigenstates K+K− or π+π−, and the lifetime in the D0 decays to K−π+. From the difference of the two lifetimes, the mixing parameter yCP is found to be 3.2 standard deviations from zero. In the second measurement, we analyzed the time dependent Dalitz plot for the D0 → K0sπ+π− decays, from which the mixing parameters x and y are determined. We also searched for a CP asymmetry between D0 and D̄ ecays, and found no evidence for it.
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