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Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France.
Phys Rev Lett. 2005 May 13;94(18):181802. doi: 10.1103/PhysRevLett.94.181802. Epub 2005 May 12.
Based on a sample of 227 x 10(6) BB pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure the branching fraction B(B0-->pi(0)pi(0))=(1.17+/-0.32+/-0.10)x10(-6), and the asymmetry Cpi(0)(pi(0))=-0.12+/-0.56+/-0.06. The B0-->pi(0)pi(0) signal has a significance of 5.0 sigma. We also measure B(B+-->pi(+)pi(0))=(5.8+/-0.6+/-0.4)x10(-6), B(B+-->K+pi(0))=(12.0+/-0.7+/-0.6)x10(-6), and the charge asymmetries Api(+)(pi(0))=-0.01+/-0.10+/-0.02 and AK+(pi(0))=0.06+/-0.06+/-0.01. Using isospin relations, we find an upper bound on the angle difference |alpha-alpha(eff)| of 35 degrees at the 90% C.L.
基于SLAC的PEP-II非对称能量B工厂的BABAR探测器收集的227×10⁶个B⁰B⁰对样本，我们测量了分支比B(B⁰→π⁰π⁰)=(1.17±0.32±0.10)×10⁻⁶，以及不对称性Cπ⁰(π⁰)= -0.12±0.56±0.06。B⁰→π⁰π⁰信号的显著性为5.0σ。我们还测量了B(B⁺→π⁺π⁰)=(5.8±0.6±0.4)×10⁻⁶，B(B⁺→K⁺π⁰)=(12.0±0.7±0.6)×10⁻⁶，以及电荷不对称性Aπ⁺(π⁰)= -0.01±0.10±0.02和AK⁺(π⁰)= 0.06±0.06±0.01。利用同位旋关系，我们在90%置信水平下得到角度差|α - α(eff)|的上限为35度。
