BEPC共振事例的碎裂特性  

Fragmentation Character of Resonance Events in BEPC e^+e^- Annihilation

作　　者：刘希明[1] 张学尧[1] 王海龙[1] 王玉水[1] 

机构地区：[1]山东大学物理系,济南250100

出　　处：《高能物理与核物理》2002年第6期557-562,共6页High Energy Physics and Nuclear Physics

基　　金：北京正负电子对撞机国家实验室开放课题

摘　　要：发现e+e- →J/ ψ→ 3g三胶子碎裂的末态强子多重数〈n〉满足与e+e- →q0 q0 连续区事例相同的普适质量关系〈n〉 =A2S + 12I+ 1 exp( -bm2 ) .表明胶子、夸克碎裂成强子时有相同的规律性 .同样可以把参数A解释为直生介子、重子多重数〈M〉 +〈B〉 .虽然对Υ→ 3g与连续区事例进行比较 ,末态重子多重数增高2 .5倍 ,但是利用我们对J/ ψ→ 3g共振区的计算研究 ,没有发现J/ ψ→ 3g事例有类似的特征 .In this paper an important character was found that the final hadron multiplicities of direct J/ψ decays satisfy the same universal mass dependence as that in e +e -→q 0 0 continuum events. This indicates that the fragmentation of quark and gluon to hadron follows the same mechanism. We give a reasonable interpretation to final baryon multiplicity that is enhanced by 2.5 times in direct Y decays compared to the continuum through our calculating results. But we cannot find this similar phenomenon in direct J/ψ decays.

关 键 词：BEPC 共振事例 碎裂特性 高能反应 胶子碎裂 强子多重数 普适质量关系 强相互作用 夸克 多喷注事例 

分 类 号：O572.3[理学—粒子物理与原子核物理]