Search for D[sup 0]−D[sup 0] mixing and CP violation at CLEO

Abstract

We present recent results of searches for D0−D0¯ mixing, doubly-Cabibbo-suppressed decays, and CP violation using 9 fb−1 of e+e− collisions collected with the CLEO II.V detector on and just below the Υ(4S) resonance. We have observed the first signal for the “wrong-sign” decay D0→K+π−π0. Using the D0→K+π− final state, we limit the mixing parameters x′ and y′ to (1/2)x′2<0.041% and −5.8%<y′<1.0%, respectively, and the CP asymmetry in D0→K+π− to −0.36<AD<0.30 at the 95% confidence level. We also measured the CP asymmetry in the decays of D0 to the CP-even K+K− and π+π− final states to be (0.04±2.18(stat)±0.84(sys))% and (1.94±3.22(stat)±0.84(sys))%, respectively.