Rate measurement of D0 → K+ π π0 and constraints on D0 − D¯0 mixing

CLEO Collaboration

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Abstract

We present an observation and time-integrated rate measurement of the decay D0 → K+ π π0 produced in 9fb−1 of e+e collisions near the r(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 D¯0 → K+ π π0 to be 0.00430.0011−0.0011 (stat) ± 0.0007(syst) This decay can be produced by doubly Cabibbo-suppressed decays or by the D0 evolving into a D¯0 through mixing, followed by a Cabibbo-favored decay to K+ π π0. We also found the CP asymmetry A = (9+25−22)% be consistent with zero.

Original languageEnglish (US)
Pages (from-to)71802-1-71802-4
JournalPhysical Review Letters
Volume87
Issue number7
DOIs
StatePublished - Aug 13 2001

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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