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Department of Physics, National Taiwan University, Taipei.
Phys Rev Lett. 2005 May 13;94(18):181803. doi: 10.1103/PhysRevLett.94.181803. Epub 2005 May 12.
We report the observation of the decay B0-->pi(0)pi(0), using a 253 fb(-1) data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB e(+)e(-) collider. The measured branching fraction is B(B0-->pi(0)pi(0))=(2.3(+0.4+0.2)(-0.5-0.3))x10(-6), with a significance of 5.8 standard deviations including systematic uncertainties. We also make a measurement of the direct CP violating asymmetry in this mode.
我们报告了使用在KEKB正负电子对撞机上的Belle探测器，在Upsilon(4S)共振处收集的253 fb⁻¹数据样本对衰变B⁰→π⁰π⁰的观测。测量得到的分支比为B(B⁰→π⁰π⁰) = (2.3(+0.4 + 0.2)(-0.5 - 0.3))×10⁻⁶，包括系统不确定性在内的显著性为5.8个标准差。我们还对该模式下的直接CP破坏不对称性进行了测量。
