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Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France.
Phys Rev Lett. 2004 Dec 3;93(23):231801. doi: 10.1103/PhysRevLett.93.231801. Epub 2004 Dec 2.
Using a data sample of 89 x 10(6) Upsilon(4S)-->BB decays collected with the BABAR detector at the PEP-II asymmetric B Factory at SLAC, we measure the B0(B (0))-->rho(+)rho(-) branching fraction as [30+/-4(stat)+/-5(syst)]x10(-6) and a longitudinal polarization fraction of f(L)=0.99+/-0.03(stat)+0.04-0.03(syst). We measure the time-dependent-asymmetry parameters of the longitudinally polarized component of this decay as C(L)=-0.17+/-0.27(stat)+/-0.14(syst) and S(L)=-0.42+/-0.42(stat)+/-0.14(syst). We exclude values of alpha between 19 degrees and 71 degrees (90% C.L.).
利用在SLAC的PEP-II非对称B工厂用BABAR探测器收集的89×10⁶个Υ(4S)→BB衰变的数据样本，我们测量到B⁰(B⁰)→ρ⁺ρ⁻的分支比为[30±4(统计)±5(系统)]×10⁻⁶，纵向极化分数f(L)=0.99±0.03(统计)+0.04 - 0.03(系统)。我们测量该衰变纵向极化分量的时间相关不对称参数为C(L)= - 0.17±0.27(统计)±0.14(系统)和S(L)= - 0.42±0.42(统计)±0.14(系统)。我们排除了19度至71度之间的α值(90%置信水平)。
