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Institute of Physics, Academia Sinica, Taipei, Taiwan 11529, Rpublic of China.
Phys Rev Lett. 2008 Mar 28;100(12):121802. doi: 10.1103/PhysRevLett.100.121802. Epub 2008 Mar 27.
We measure the time dependence of the ratio of decay rates for the rare decay D{0}-->K{+}pi{-} to the Cabibbo-favored decay D{0}-->K{-}pi;{+}. A signal of 12.7x10;{3} D{0}-->K{+}pi{-} decays was obtained using the Collider Detector at Fermilab II detector at the Fermilab Tevatron with an integrated luminosity of 1.5 fb;{-1}. We measure the D0-D[over ]{0} mixing parameters (R_{D},y{'},x{'2}), and find that the data are inconsistent with the no-mixing hypothesis with a probability equivalent to 3.8 Gaussian standard deviations.
我们测量了稀有衰变D⁰→K⁺π⁻与Cabibbo允许衰变D⁰→K⁻π⁺的衰变率之比随时间的变化关系。利用费米实验室Tevatron的费米实验室II探测器，在积分亮度为1.5 fb⁻¹的情况下，获得了12.7×10³次D⁰→K⁺π⁻衰变的信号。我们测量了D⁰-D⁰混合参数（R_D、y′、x′²），发现数据与无混合假设不一致，其概率相当于3.8个高斯标准差。
