ψ′→J/ψπ^+π^-衰变振幅的分波分析  

Partial Wave Analysis of the Decay ψ′→J/ψπ^+π^-

作　　者：庄霆亮[1] 郭子金[2] 魏毅 李金[2] 闫沐霖[1] 

机构地区：[1]中国科学技术大学非线性科学中心,合肥230027 [2]中国科学院高能物理研究所,北京100039

出　　处：《高能物理与核物理》2000年第7期616-623,共8页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金! ( 192 90 4 0 0 );中国科学院LWTZ - 12 98经费资助

摘　　要：从 ψ′→J/ ψπ+ π-衰变振幅的普遍表达式和过程的运动学出发 ,给出了ππ不变质量谱 ,角关联谱和不变质量 -角关联双变量谱 ;进行了分波分析 ,使得从实验上检测D波跃迁成为可能 .文中还对来自J/ ψ反冲的D波跃迁作了讨论 .In this paper,a model independant amplitude for the decay process of ψ′→J/ψπ +π - is constructed from a few basic rules:Lorentz invariance,PCAC (Partial Conservation of Axial Current) and QCD low energy theorem. Based on this amplitude, a new and complete partial wave analysis to this process is carried out. Formulae of angular correlation distribution,invarant mass spectrum and two dimension (joint angular correlation and invarant mass) distribution are given. It is pointed out that there exist D -wave in the ψ′→J/ψπ +π -process and part of the D -wave is caused by recoil of J/ψ.

关 键 词：Ψ′→J/Ψπ^+π^- 衰变振幅 分波分析 胶子 

分 类 号：O572.2[理学—粒子物理与原子核物理]