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Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France.
Phys Rev Lett. 2004 Jul 30;93(5):051802. doi: 10.1103/PhysRevLett.93.051802. Epub 2004 Jul 28.
We present measurements of branching fractions and charge asymmetries in B-meson decays to rho(+)pi(0), rho(0)pi(+), and rho(0)pi(0). The data sample comprises 89x10(6) Upsilon(4S)-->BBmacr; decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We find the charge-averaged branching fractions B(B+-->rho(+)pi(0))=[10.9+/-1.9(stat)+/-1.9(syst)]x10(-6) and B(B+-->rho(0)pi(+))=(9.5+/-1.1+/-0.9)x10(-6), and we set a 90% confidence-level upper limit B(B0-->rho(0)pi(0))<2.9x10(-6). We measure the charge asymmetries ACP(pi(0))(rho(+))=0.24+/-0.16+/-0.06 and ACP(pi(+))(rho(0))=-0.19+/-0.11+/-0.02.
我们给出了B介子衰变为ρ⁺π⁰、ρ⁰π⁺和ρ⁰π⁰的分支比和电荷不对称性的测量结果。数据样本包括在SLAC的PEP-II非对称能量B工厂使用BABAR探测器收集的89×10⁶个Υ(4S)→BB⁻衰变事例。我们发现电荷平均分支比B(B⁺→ρ⁺π⁰)=[10.9±1.9(统计)±1.9(系统)]×10⁻⁶以及B(B⁺→ρ⁰π⁺)=(9.5±1.1±0.9)×10⁻⁶，并且我们设定了90%置信水平上限B(B⁰→ρ⁰π⁰)<2.9×10⁻⁶。我们测量了电荷不对称性ACP(π⁰)(ρ⁺)=0.24±0.16±0.06以及ACP(π⁺)(ρ⁰)= -0.19±0.11±0.02。
