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European Organization for Nuclear Research (CERN), Geneva, Switzerland.
Physik-Institut, Universität Zürich, Zürich, Switzerland.
Phys Rev Lett. 2016 Jun 17;116(24):241801. doi: 10.1103/PhysRevLett.116.241801.
Charm meson oscillations are observed in a time-dependent analysis of the ratio of D^{0}→K^{+}π^{-}π^{+}π^{-} to D^{0}→K^{-}π^{+}π^{-}π^{+} decay rates, using data corresponding to an integrated luminosity of 3.0 fb^{-1} recorded by the LHCb experiment. The measurements presented are sensitive to the phase-space averaged ratio of doubly Cabibbo-suppressed to Cabibbo-favored amplitudes r_{D}^{K3π} and the product of the coherence factor R_{D}^{K3π} and a charm mixing parameter y_{K3π}^{'}. The constraints measured are r_{D}^{K3π}=(5.67±0.12)×10^{-2}, which is the most precise determination to date, and R_{D}^{K3π}y_{K3π}^{'}=(0.3±1.8)×10^{-3}, which provides useful input for determinations of the CP-violating phase γ in B^{±}→DK^{±}, D→K^{∓}π^{±}π^{∓}π^{±} decays. The analysis also gives the most precise measurement of the D^{0}→K^{+}π^{-}π^{+}π^{-} branching fraction, and the first observation of D^{0}-D[over ¯]^{0} oscillations in this decay mode, with a significance of 8.2 standard deviations.
在对(D^{0}\to K^{+}\pi^{-}\pi^{+}\pi^{-})与(D^{0}\to K^{-}\pi^{+}\pi^{-}\pi^{+})衰变率之比进行的含时分析中，利用大型强子对撞机底夸克实验（LHCb实验）记录的对应于(3.0 fb^{-1})积分亮度的数据，观测到了粲介子振荡。所呈现的测量结果对双Cabibbo压低振幅与Cabibbo压低振幅的相空间平均比值(r_{D}^{K3\pi})以及相干因子(R_{D}^{K3\pi})与一个粲混合参数(y_{K3\pi}^{'})的乘积敏感。测得的约束为(r_{D}^{K3\pi}=(5.67\pm0.12)\times10^{-2})，这是迄今为止最精确的测定结果，以及(R_{D}^{K3\pi}y_{K3\pi}^{'}=(0.3\pm1.8)\times10^{-3})，这为在(B^{±}\to DK^{±})、(D\to K^{∓}\pi^{±}\pi^{∓}\pi^{±})衰变中确定CP破坏相位(\gamma)提供了有用的输入。该分析还给出了(D^{0}\to K^{+}\pi^{-}\pi^{+}\pi^{-})分支比的最精确测量结果，以及在此衰变模式下(D^{0}-\overline{D}^{0})振荡的首次观测，显著性为8.2个标准差。
