# Observation of D0-D0bar oscillations

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-D0bar oscillations from a single measurement.
docType_s :
Journal articles
Physical Review Letters, American Physical Society, 2013, 110, pp.101802. <10.1103/PhysRevLett.110.101802>
Domain :

http://hal.in2p3.fr/in2p3-00749283
Contributor : Françoise Marechal <>
Submitted on : Wednesday, November 7, 2012 - 11:00:00 AM
Last modification on : Monday, March 11, 2013 - 3:00:30 PM

### Citation

R. Aaij, S. Barsuk, O. Callot, J. He, B. Jean-Marie, et al.. Observation of D0-D0bar oscillations. Physical Review Letters, American Physical Society, 2013, 110, pp.101802. <10.1103/PhysRevLett.110.101802>. <in2p3-00749283>