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Laboratoire de Physique des Particules, IN2P3/CNRS et Université de Savoie, F-74941 Annecy-Le-Vieux, France.
Phys Rev Lett. 2007 Apr 13;98(15):151802. doi: 10.1103/PhysRevLett.98.151802.
We present a study of the decays B+-->rho+gamma, B0-->rho0gamma, and B0-->omegagamma. The analysis is based on data containing 347 x 10(6) BB[over ] events recorded with the BABAR detector at the PEP-II asymmetric B factory. We measure the branching fractions B(B+-->rho+)gamma)=(1.10_(-0.33)(+0.37)+/-0.09)x10(-6) and B(B0-->rho0gamma)=(0.79(-0.20)(+0.22)+/-0.06)x10(-6), and set a 90% C.L. upper limit B(B0-->omegagamma)<0.78 x 10(-6). We also measure the isospin-averaged branching fraction B(B-->(rho/omega)gamma)=(1.25(-0.24)(+0.25)+/-0.09)x10(-6), from which we determine |Vtd/Vts|=0.200(-0.020)(+0.021)+/-0.015, where the first uncertainty is experimental and the second is theoretical.
我们展示了一项关于B⁺→ρ⁺γ、B⁰→ρ⁰γ和B⁰→ωγ衰变的研究。该分析基于在PEP-II非对称B工厂使用BABAR探测器记录的包含347×10⁶个BB⁻对事例的数据。我们测量了分支比B(B⁺→ρ⁺γ)=(1.10₋₀.₃₃⁺⁰.₃₇±0.09)×10⁻⁶和B(B⁰→ρ⁰γ)=(0.79₋₀.₂₀⁺⁰.₂₂±0.06)×10⁻⁶，并设定了90%置信水平的上限B(B⁰→ωγ)<0.78×10⁻⁶。我们还测量了同位旋平均分支比B(B⁻→(ρ/ω)γ)=(1.25₋₀.₂₄⁺⁰.₂₅±0.09)×10⁻⁶，由此我们确定|Vtd/Vts|=0.200₋₀.₀₂₀⁺⁰.₀₂₁±0.015，其中第一个不确定度是实验性的，第二个是理论性的。
