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Laboratoire de Physique des Particules, Annecy-le-Vieux, France.
Phys Rev Lett. 2005 Jul 22;95(4):041805. doi: 10.1103/PhysRevLett.95.041805. Epub 2005 Jul 21.
We present results from an analysis of B(0)B(0)--> rho(+)rho(-) using 232 x 10(6) Gamma (4S) --> BB decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. We measure the longitudinal polarization fraction f(L) = 0.978 +/- 0.014(stat) + 0.021 / -0.029(syst) and the CP-violating parameters S(L)= -0.33 +/- 0.24(stat) + 0.08 / -0.14(syst) and C(L)= -0.03 +/- 0.18(stat) +/- 0.09(syst). Using an isospin analysis of B --> rhorho decays, we determine the unitarity triangle parameter alpha. The solution compatible with the standard model is alpha = (100 +/- 13) degrees.
我们展示了利用在SLAC的PEP-II非对称能量B工厂的BABAR探测器收集的232×10⁶次Γ(4S)→BB衰变，对B(0)B(0)→ρ⁺ρ⁻进行分析的结果。我们测量了纵向极化分数f(L)=0.978±0.014(统计) + 0.021 / -0.029(系统)，以及CP破坏参数S(L)= -0.33±0.24(统计) + 0.08 / -0.14(系统)和C(L)= -0.03±0.18(统计)±0.09(系统)。通过对B→ρρ衰变的同位旋分析，我们确定了幺正三角形参数α。与标准模型兼容的解为α=(100±13)度。
