【摘 要】
：
研究了e+e-实验中ψ(2S)能区连续态单光子湮没过程的截面对观测总截面的贡献. 针对ψ(2S)质量处ωπ0和π+π-两个观测末态,利用唯象模型估计了单光子湮没过程贡献的大小. 分
【机 构】
：
中国科学院高能物理研究所,中国高等科学技术中心
论文部分内容阅读
研究了e+e-实验中ψ(2S)能区连续态单光子湮没过程的截面对观测总截面的贡献. 针对ψ(2S)质量处ωπ0和π+π-两个观测末态,利用唯象模型估计了单光子湮没过程贡献的大小. 分析表明,对于ψ(2S)→ωπ0和ψ(2S)→π+π-,以及其他电磁末态分支比的确定,单光子湮没过程的贡献必须认真考虑. 通过研究,我们认为对于BES实验来说,为了获得共振态电磁末态分支比的正确结果,至少需要在低于ψ(2S)共振峰的能量点采集10pb-1的数据.
其他文献
Ribosome-inactivating proteins in Trichosanthes kirilowii having high anti-HIV activity can be efficiently obtained by culturing Trichosanthes kirilowii hairy
This paper is to solve several problems on the global attractivity of the zero solution of the nonautonomous difference equation xn+1 - xn + Pnxn-kn = 0, n ∈ Z
L2 estimates are obtained for some oscillatory singular integral operators with analytic phrases by using the technology of almost orthogonality, oscillatory es
The flashover of insulator strings occurring at normal working voltages under contaminated/polluted conditions, obviously deserves serious consideration. Though
The influence of growth pressure of GaN buffer layer on the properties of MOCVD GaN on α-Al2O3 has been investigated with the aid of a home-made in situ laser
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7
将Feshbach-Kerman-Koonin(FKK)量子多步复合(MSC)理论推广至核子自旋为1/2,靶核自旋任意,在j -j表象严格处理角动量耦合,得到自旋为1/2的FKK-MSC公式. 进一步用光学模型吸收
The spectrum of a graph is the set of all eigenvalues of the Laplacian matrix of the graph. There is a closed relationship between the Laplacian spectrum of gr
A corona discharge plasma-enhanced chemical vapor deposition with the features of atmospheric pressure and low temperature has been developed to synthesize the