标题： 搜索B0衰变为J/psi gamma 显示英文标题

标题： Search for the decay B0 --> J/psi gamma

摘要： 我们报告了在包含123百万个Y(4S)--> B B-bar衰变的数据集中寻找B0 --> J/psi gamma辐射衰变的结果，这些数据由BABAR探测器在SLAC的PEP-II非对称能量e+e-储存环上收集。我们未发现信号证据，并在90%置信水平下给出B(B0 --> J/psi gamma)的上限小于1.6 x 10^-6。 显示英文摘要

摘要： We present the results of a search for the radiative decay B0 --> J/psi gamma in a data set containing 123 million Y(4S)--> B B-bar decays, collected by the BABAR detector at the PEP-II asymmetric-energy e+e- storage ring at SLAC. We find no evidence for a signal and place an upper limit of B(B0 --> J/psi gamma) < 1.6 x 10^-6 at 90% confidence level.