We report a measurement of the time-dependent ratio of D0→K +π - to D0→K -π + decay rates in D* +-tagged events using 1.0 fb -1 of integrated luminosity recorded by the LHCb experiment. We measure the mixing parameters x′2=(-0.9±1.3)×10 -4, y′=(7.2±2.4)×10 -3, and the ratio of doubly-Cabibbo-suppressed to Cabibbo-favored decay rates R D=(3. 52±0.15)×10 -3, where the uncertainties include statistical and systematic sources. The result excludes the no-mixing hypothesis with a probability corresponding to 9.1 standard deviations and represents the first observation of D0-D ̄0 oscillations from a single measurement.
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)