Charm CP violation and mixing at Belle

Abstract

We present charm CP violation and mixing measurements at Belle. They are the first observation of D0 − D̄0 mixing in e+e− collisions from D0 → K+π− decays, the most precise mixing and indirect CP violation parameters from D0 → K0Sπ+π− decays, and the timeintegrated CP asymmetries in D0 → π0π0 and D0 → K0Sπ0 decays. Our mixing measurement in D0 → K+π− decays excludes the no-mixing hypothesis at the 5.1 standard deviation level. The mixing parameters x = (0.56 ± 0.19+0.03+0.06−0.09−0.09)%, y = (0.30 ± 0.15+0.04+0.03−0.05−0.06)% and indirect CP violation parameters |q/p| = (0.90+0.16+0.05+0.06−0.15−0.04−0.05)%, arg(q/p) = (−6 ± 11 ± 3+3−4)° measured from D0 → K0Sπ+π− decays, and the time-integrated CP asymmetries AD0→π0π0CP = (−0.03 ± 0.64 ± 0.10)% and AD0→K0Sπ0CP = (−0.21 ± 0.16 ± 0.07)% are the most precisemeasurements to date. Our measurements here are consistent with predictions of the standard model.