分类: 物理学 >> 凝聚态:结构、力学和热性能 提交时间: 2017-03-26
摘要: The e+e− decay partial width of the recently observed state, X(3872), is estimated using the ISR data collected Root s=4.03 GeV in e+e− annihilation experiment by BES at BEPC. It is found that Γe+e-Bπ+π-J/ψ<10eV at 90% C.L. if the JPC of X(3872) is 1−−. Together with the potential models and other information, we conclude that X(3872) is very unlikely to be a vector state.
分类: 物理学 >> 凝聚态:结构、力学和热性能 提交时间: 2017-03-26
摘要: With the known branching ratios of ψ(2S)→π+π− and ψ(2S)→K+K−, the branching ratio of ψ(2S)→K0SK0L is calculated as a function of the relative phase between the strong and the electromagnetic amplitudes of the ψ(2S) decays. The study shows that the branching ratio of ψ(2S)→K0SK0L is sensitive to the relative phase and a measurement of the K0SK0L branching ratio will shed light on the relative phase determination in ψ(2S)→0−0− decays.