论文部分内容阅读
With a 15M J/ψ inclusive Monte Carlo sample, the absolute branching fraction of J/ψ → γη from the J/ψ inclusive photon spectrum is measured to be Br(J/ψ → γη)= (4.68±0.08±0.27)×10-3, which is in good agreement with the input value. The J/ψ → γfJ(2220) is also searched for using the same sample. Under our assumptions, the statistical significances of J/ψ → γfJ(2220) are larger than 7σ.