Observation of D0-D0bar oscillations
LHCb collaboration: R. Aaij, C. Abellan Beteta, A. Adametz, B. Adeva,, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio,, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A.A. Alves Jr, S., Amato, Y. Amhis, L. Anderlini, J. Anderson
TL;DR
This paper reports the first observation of D0-D0bar oscillations through a time-dependent decay rate analysis, providing precise measurements of mixing parameters and confirming the phenomenon with high statistical significance.
Contribution
First measurement of D0-D0bar oscillations from a single experiment, with precise determination of mixing parameters and decay rate ratios.
Findings
Excludes no-mixing hypothesis at 9.1 sigma significance
Measures mixing parameters x'^2 and y' with uncertainties
Provides the first observation of D0-D0bar oscillations from a single measurement
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.
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