Rate Measurement of D0→K+π-π0 and Constraints on D0 - D0¯ Mixing

We present an observation and time-integrated rate measurement of the decay D0→K+π-π0 produced in 9 fb-1 of e+e- collisions near the ϒ(4S) resonance. The signal is inconsistent with an upward fluctuation of the background by 4.9 standard deviations. We measured the time-integrated rate of D0→K+π-π0...
Ausführliche Beschreibung

We present an observation and time-integrated rate measurement of the decay D0→K+π-π0 produced in 9 fb-1 of e+e- collisions near the ϒ(4S) resonance. The signal is inconsistent with an upward fluctuation of the background by 4.9 standard deviations. We measured the time-integrated rate of D0→K+π-π0 normalized to the rate of D0¯→K+π-π0 to be 0.0043-0.0010+0.0011 (stat)±0.0007 (syst). This decay can be produced by doubly Cabibbo-suppressed decays or by the D0 evolving into a D0¯ through mixing, followed by a Cabibbo-favored decay to K+π-π0. We also found the CP asymmetry A=(9-22+25)% be consistent with zero. Ausführliche Beschreibung