Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.
Phys Rev Lett. 2013 Mar 8;110(10):101802. doi: 10.1103/PhysRevLett.110.101802. Epub 2013 Mar 5.
We report a measurement of the time-dependent ratio of D(0) → K(+) π- to D(0) → 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-D0 oscillations from a single measurement.
我们报告了在 LHCb 实验记录的 1.0 fb^{-1}积分亮度下，利用 D(*+)-标记事件，对 D(0)→K(+)π-到 D(0)→K(-)π(+)衰变率的时变比的测量结果。我们测量了混合参数 x('2) = (-0.9 ± 1.3)×10^{-4}，y' = (7.2 ± 2.4)×10^{-3}，以及双重 Cabibbo 抑制与 Cabibbo 优势衰变率的比值 R(D) = (3.52 ± 0.15)×10^{-3}，其中的不确定性包括统计和系统来源。该结果以 9.1 个标准差的概率排除了无混合假设，代表了首次从单次测量中观察到 D0-D0 振荡。
