通过对 BABAR 和 Belle 数据的联合时变分析首次观察到 B[over ¯]^{0}→D_{CP}^{(*)}h^{0} 衰变中的 CP 破坏。
First Observation of CP Violation in B[over ¯]^{0}→D_{CP}^{(*)}h^{0} Decays by a Combined Time-Dependent Analysis of BABAR and Belle Data.
机构信息
Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451, Kingdom of Saudi Arabia.
SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193, Japan.
出版信息
Phys Rev Lett. 2015 Sep 18;115(12):121604. doi: 10.1103/PhysRevLett.115.121604. Epub 2015 Sep 16.
We report a measurement of the time-dependent CP asymmetry of B[over ¯]^{0}→D_{CP}^{()}h^{0} decays, where the light neutral hadron h^{0} is a π^{0}, η, or ω meson, and the neutral D meson is reconstructed in the CP eigenstates K^{+}K^{-}, K_{S}^{0}π^{0}, or K_{S}^{0}ω. The measurement is performed combining the final data samples collected at the ϒ(4S) resonance by the BABAR and Belle experiments at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain (471±3)×10^{6} BB[over ¯] pairs recorded by the BABAR detector and (772±11)×10^{6} BB[over ¯] pairs recorded by the Belle detector. We measure the CP asymmetry parameters -η_{f}S=+0.66±0.10(stat)±0.06(syst) and C=-0.02±0.07(stat)±0.03(syst). These results correspond to the first observation of CP violation in B[over ¯]^{0}→D_{CP}^{()}h^{0} decays. The hypothesis of no mixing-induced CP violation is excluded in these decays at the level of 5.4 standard deviations.
我们报告了对 B[over ¯]^{0}→D_{CP}^{()}h^{0}衰变的时变 CP 不对称性的测量，其中轻中性强子 h^{0}是 π^{0}、η 或 ω 介子，而中性 D 介子在 CP 本征态 K^{+}K^{-}、K_{S}^{0}π^{0}或 K_{S}^{0}ω 中被重建。该测量是由 BABAR 和 Belle 实验在 SLAC 的 PEP-II 和 KEK 的 KEKB 两个不对称能量 B 工厂的 Υ(4S)共振处收集的最终数据样本联合完成的。数据样本包含由 BABAR 探测器记录的 (471±3)×10^{6} BB[over ¯]对和由 Belle 探测器记录的 (772±11)×10^{6} BB[over ¯]对。我们测量了 CP 不对称参数 -η_{f}S=+0.66±0.10(stat)±0.06(syst) 和 C=-0.02±0.07(stat)±0.03(syst)。这些结果对应于 B[over ¯]^{0}→D_{CP}^{()}h^{0}衰变中首次观察到的 CP 破坏。在这些衰变中，混合诱导的 CP 破坏假设被排除在 5.4 个标准差的水平之外。
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