过程J/ψ→+X,X→Δ+π产生重子共振态X的研究  

Study on the Baryon State X Produced in the Process J/ψ→+X,X→Δ+π

作　　者：沈齐兴[1] 郁宏[1] 

机构地区：[1]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》2003年第4期288-292,共5页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 ( 1983 5 0 6010 0 470 0 3 );北京正负电子对撞机国家实验室 (运行 G65 0 2 )资助~~

摘　　要：利用螺旋度角分布分析和推广的矩分析方法 ,讨论了J ψ衰变过程J ψ→p+X ,X→Δ +π ,其中p和Δ分别是反质子和自旋 -宇称为 (3 2 ) + 的Δ重子 ,给出了相应于自旋 -宇称为 (1 2 ) ± ,(3 2 ) ± 和 (5 2 ) ± 的重子共振态 (包括混杂重子态 )X的角分布和矩表达式 .The existence of the new class of hadronic states, glueball, hybrid mesons and hybrid baryons, is one of the important prediction of the QCD. It is an excited and attractive research preject to search for and identify these non q q meson and non qqq baryon states. The theoretical expectations on the mass spectrum of hybrid baryons have been carried out in the bag model, QCD sum rules and flux tube model. We might expect that J/ψ hadronic decay processes are the good place to study hybrid baryons. The J/ψ decay process J/ψ→p+X,X→Δ+π, where p and Δ are the antiproton and Δ baryon with spin parity (3/2) +, respectively, are studied in terms of the angular distribution and the generalized moment analysis methods. Precise angular distribution and moment representation of baryon resonance (including the hybrid baryon) X with spin parity (1/2) ±,(3/2) ±,and (5/2) ± are obtained. They can be used to identify the spin of the baryon resonance state X.

关 键 词：重子共振态 J/Ψ衰变 混杂重子态 角分布 矩分析 夸克模型 量子色动力学 螺旋度 

分 类 号：O572.243[理学—粒子物理与原子核物理]