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Zhang Y, Zhang Y, Zhelezov A, Zheng Y, Zhokhov A, Zhu X, Zhukov V, Zucchelli S
European Organization for Nuclear Research (CERN), Geneva, Switzerland.
Universidad de Santiago de Compostela, Santiago de Compostela, Spain.
Phys Rev Lett. 2016 Dec 23;117(26):261801. doi: 10.1103/PhysRevLett.117.261801.
The CP violation observables S and C in the decay channel B^{0}→D^{+}D^{-} are determined from a sample of proton-proton collisions at center-of-mass energies of 7 and 8 TeV, collected by the LHCb experiment and corresponding to an integrated luminosity of 3 fb^{-1}. The observable S describes CP violation in the interference between mixing and the decay amplitude, and C parametrizes direct CP violation in the decay. The following values are obtained from a flavor-tagged, decay-time-dependent analysis: S=-0.54_{-0.16}^{+0.17}(stat)±0.05(syst), C=0.26_{-0.17}^{+0.18}(stat)±0.02(syst). These values provide evidence for CP violation at a significance level of 4.0 standard deviations. The phase shift due to higher-order standard model corrections is constrained to a small value of Δϕ=-0.16_{-0.21}^{+0.19} rad.
在衰变道(B^{0}→D^{+}D^{-})中，CP破坏可观测量(S)和(C)是由大型强子对撞机底夸克实验（LHCb实验）在质心能量为7和8 TeV的质子-质子碰撞样本中确定的，该样本对应的积分亮度为3 fb⁻¹。可观测量(S)描述了混合与衰变振幅干涉中的CP破坏，而(C)参数化了衰变中的直接CP破坏。以下值是通过味标记、衰变时间相关分析得到的：(S = -0.54_{-0.16}^{+0.17})（统计）(±0.05)（系统），(C = 0.26_{-0.17}^{+0.18})（统计）(±0.02)（系统）。这些值为在4.0个标准差的显著水平下的CP破坏提供了证据。由高阶标准模型修正引起的相移被限制在一个小值(Δϕ = -0.16_{-0.21}^{+0.19}) rad。
