Mixing and CP Violation in the Decay of Neutral D Mesons at CLEO
D. Cronin-Hennessy, CLEO Collaboration
Abstract
We present preliminary results of several analyses searching for the effects of CP violation and mixing in the decay of D0 mesons. We find no evidence of CP asymmetry in five different two-body decay modes of the D0 to pairs of light pseudo-scalar mesons: ACP(K+ K-) = (+0.05 +- 2.18 +- 0.84)%, ACP(pi+ pi-) = (+2.0 +- 3.2 +- 0.8)%, ACP(K0S pi0) = (+0.1 +- 1.3)%, ACP(pi0 pi0) = (+0.1 +- 4.8)% and ACP(K0S K0S) = (-23 +- 19)%. We present the first measurement of the rate of wrong-sign D0 -> K+ pi- pi0 decay: RWS = 0.0043 + 0.0011 - 0.0010 +- 0.0007. Finally, we describe a measurement of the mixing parameter yCP= Delta Gamma / (2 Gamma) by searching for a lifetime difference between the CP neutral K+ pi- final state and the CP even K+K- and pi+pi- final states. Under the assumption that CP is conserved we find yCP = -0.011 +- 0.025 +- 0.014.
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