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Journal Articles Physical Review Letters Year : 2013

Observation of D0-D0bar oscillations

J. He
R. Aaij
  • Function : Author
J. Cogan
O. Leroy
J. Serrano


We report a measurement of the time-dependent ratio of D0->K+pi- to D0->K-pi+ 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)x10^{-4}, y'=(7.2+-2.4)x10^{-3} and the ratio of doubly-Cabibbo-suppressed to Cabibbo-favored decay rates R_D=(3.52+-0.15)x10^{-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-D0bar oscillations from a single measurement.

Dates and versions

in2p3-00749283 , version 1 (07-11-2012)



S. Barsuk, O. Callot, J. He, B. Jean-Marie, J. Lefrançois, et al.. Observation of D0-D0bar oscillations. Physical Review Letters, 2013, 110, pp.101802. ⟨10.1103/PhysRevLett.110.101802⟩. ⟨in2p3-00749283⟩
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