Study of D0-D̄0 mixing and D0 doubly Cabibbo-suppressed decays
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics(1998)
摘要
Using a sample of four million hadronic Z events collected in ALEPH from 1991 to 1995, the decays D*+ → D0π+ s, with D0 decaying to K- π+ or to K+ π-, are studied. The relative branching ratio B(D0 → K+ π-)/B(D0 → K- π+) is measured to be (1.84±0.59(stat.) ±0.34(syst.))%. The two possible contributions to the D0 → K+ π- decay, doubly Cabibbo-suppressed decays and D0-D̄0 mixing, are disentangled by measuring the proper-time distribution of the reconstructed D0,s. Assuming no interference between the two processes, the upper limit obtained on the mixing rate is 0.92% at 95% CL. The possible effect of interference between the two amplitudes is also assessed. © 1998 Elsevier Science B.V. All rights reserved.
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