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Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
Department of Physics, University of Warwick, Coventry, United Kingdom.
Phys Rev Lett. 2023 Sep 1;131(9):091802. doi: 10.1103/PhysRevLett.131.091802.
The time-integrated CP asymmetry in the Cabibbo-suppressed decay D^{0}→K^{-}K^{+} is measured using proton-proton collision data, corresponding to an integrated luminosity of 5.7 fb^{-1} collected at a center-of-mass energy of 13 TeV with the LHCb detector. The D^{0} mesons are required to originate from promptly produced D^{*+}→D^{0}π^{+} decays, and the charge of the companion pion is used to determine the flavor of the charm meson at production. The time-integrated CP asymmetry is measured to be A_{CP}(K^{-}K^{+})=[6.8±5.4±1.6]×10^{-4} where the first uncertainty is statistical and the second systematic. The direct CP asymmetries in D^{0}→K^{-}K^{+} and D^{0}→π^{-}π^{+} decays, a_{K^{-}K^{+}}^{d} and a_{π^{-}π^{+}}^{d}, are derived by combining A_{CP}(K^{-}K^{+}) with the time-integrated CP asymmetry difference, ΔA_{CP}=A_{CP}(K^{-}K^{+})-A_{CP}(π^{-}π^{+}), and other inputs, giving a_{K^{-}K^{+}}^{d}=(7.7±5.7)×10^{-4},a_{π^{-}π^{+}}^{d}=(23.2±6.1)×10^{-4},with a correlation coefficient corresponding to ρ=0.88. The compatibility of these results with CP symmetry is 1.4 and 3.8 standard deviations for D^{0}→K^{-}K^{+} and D^{0}→π^{-}π^{+} decays, respectively. This is the first evidence for direct CP violation in a specific D^{0} decay.
利用质子 - 质子碰撞数据测量了卡比博压低衰变(D^{0}→K^{-}K^{+})中的时间积分CP不对称性，这些数据对应于大型强子对撞机底夸克探测器在质心能量为13 TeV时收集的5.7(fb^{-1})的积分亮度。要求(D^{0})介子源自即时产生的(D^{* +}→D^{0}π^{+})衰变，并且伴随π介子的电荷用于确定产生时粲介子的味。测得时间积分CP不对称性为(A_{CP}(K^{-}K^{+}) = [6.8±5.4±1.6]×10^{-4})，其中第一个不确定度是统计性的，第二个是系统性的。通过将(A_{CP}(K^{-}K^{+}))与时间积分CP不对称性差值(\Delta A_{CP}=A_{CP}(K^{-}K^{+}) - A_{CP}(π^{-}π^{+}))以及其他输入量相结合，推导出(D^{0}→K^{-}K^{+})和(D^{0}→π^{-}π^{+})衰变中的直接CP不对称性(a_{K^{-}K^{+}}^{d})和(a_{π^{-}π^{+}}^{d})，得到(a_{K^{-}K^{+}}^{d}=(7.7±5.7)×10^{-4})，(a_{π^{-}π^{+}}^{d}=(23.2±6.1)×10^{-4})，相关系数(\rho = 0.88)。对于(D^{0}→K^{-}K^{+})和(D^{0}→π^{-}π^{+})衰变，这些结果与CP对称性的兼容性分别为1.4和3.8个标准差。这是特定(D^{0})衰变中直接CP破坏的首个证据。
