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.
出处
《高能物理与核物理》
CSCD
北大核心
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
