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Osaka University, Osaka.
Phys Rev Lett. 2005 Aug 5;95(6):061801. doi: 10.1103/PhysRevLett.95.061801. Epub 2005 Aug 1.
We present a measurement of CP-violation parameters in the B0 --> K(s)0K(s)0K(s)0 decay based on a sample of 275 x 10(6) BB pairs collected at the upsilon(4S) resonance with the Belle detector at the KEKB energy-asymmetric e+e- collider. One neutral B meson is fully reconstructed in the decay B0 --> K(s)0K(s)0K(s)0, and the flavor of the accompanying B meson is identified from its decay products. CP-violation parameters are obtained from the asymmetry in the distributions of the proper-time interval between the two B decays: S = +1.26 +/- 0.68(stat) +/- 0.20(syst) and [symbol: see text] = +0.54 +/- 0.34(stat) +/- 0.09(syst).
我们基于在KEKB能量不对称正负电子对撞机上使用Belle探测器在Upsilon(4S)共振处收集的275×10⁶个BB对样本，给出了B⁰→Kₛ⁰Kₛ⁰Kₛ⁰衰变中CP破坏参数的测量结果。一个中性B介子在B⁰→Kₛ⁰Kₛ⁰Kₛ⁰衰变中被完全重建，伴随的B介子的味道从其衰变产物中识别出来。CP破坏参数是从两个B衰变之间的固有时间间隔分布的不对称性中获得的：S = +1.26±0.68（统计）±0.20（系统），[符号：见文本] = +0.54±0.34（统计）±0.09（系统）。
