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Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France.
Phys Rev Lett. 2004 Mar 19;92(11):111801. doi: 10.1103/PhysRevLett.92.111801. Epub 2004 Mar 18.
A search of the exclusive radiative decays B-->rho(770)gamma and B0-->omega(782)gamma is performed on a sample of about 84x10(6) BBmacr; events collected by the BABAR detector at the SLAC PEP-II asymmetric-energy e+e- storage ring. No significant signal is seen in any of the channels. We set upper limits on the branching fractions B of B(B0-->rho(0)gamma)<1.2 x 10(-6), B(B+-->rho+gamma)<2.1 x 10(-6), and B(B0-->omegagamma)<1.0 x 10(-6) at 90% confidence level (C.L.). Using the assumption that Gamma(B-->rhogamma)=Gamma(B+-->rho(+)gamma)=2 x Gamma(B0-->rho(0)gamma), we find the combined limit B(B-->rhogamma)<1.9 x 10(-6), corresponding to B(B-->rhogamma)/B(B-->K*gamma)<0.047 at 90% C.L.
在SLAC的PEP-II非对称能正负电子存储环上，利用BABAR探测器收集的约84×10⁶个BBˉ事例样本，对B介子的专属辐射衰变B→ρ(770)γ和B⁰→ω(782)γ进行了研究。在任何一个通道中均未观察到明显信号。我们在90%置信水平（C.L.）下，对分支比B设定了上限：B(B⁰→ρ⁰γ)<1.2×10⁻⁶、B(B⁺→ρ⁺γ)<2.1×10⁻⁶以及B(B⁰→ωγ)<1.0×10⁻⁶。假设Γ(B→ργ)=Γ(B⁺→ρ⁺γ)=2×Γ(B⁰→ρ⁰γ)，我们得到组合上限B(B→ργ)<1.9×10⁻⁶，在90%置信水平下对应B(B→ργ)/B(B→K*γ)<0.047。
