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-antiD0 oscillations from a single measurement.
Lhcb, Collaboration, Aaij, R: e Andrea, Bizzeti. "Observation of D0-antiD0 oscillations" Working paper, CERN, 2012.
Observation of D0-antiD0 oscillations
BIZZETI, Andrea
2012
Abstract
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-antiD0 oscillations from a single measurement.
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