关于J/ψ辐射衰变产生胶球态的另一种机制  

An Alternative Mechanism of Glueball Production in the J/ψ Radiative Decays

作　　者：彭宏安[1] 段春贵[2] 阎占元[3] 何祯民[2] 

机构地区：[1]北京大学物理系,北京100871 [2]河北师范大学物理系,石家庄050016 [3]华北电力大学物理教学部,保定071003

出　　处：《高能物理与核物理》2002年第8期747-752,共6页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 (1 0 1 75 0 74) ;河北省自然科学基金 (1 0 0 1 44 );华北电力大学青年科研基金资助~~

摘　　要：基于粲夸克偶素J/ψ质量大而寿命长的特征的物理内涵和对胶球态产生条件的理解 ,提出了J/ψ→Gb+γ过程产生胶球态的另一种机制 ,即认为胶球态Gb 来自J/ψ中的组分粲夸克对ccon.( ccon.)分别转变为流粲夸克对ccur.( ccur.)时所发射的色八重态胶团对的融合 ,而余下的流粲夸克对再湮没为光子γ .通过用此模型的计算 ,讨论了ΓJ/ ψ→Gb+γ与有关参数值的关系 ,并与J/ψ辐射衰变中通过两个末态胶子的强子化产生胶球的机制作出了对比 .Based on the physical implication of the unusually large mass scale and long live time characteristics of J/ψ particle and on the understanding of the requirement of glueball production,we proposed an alternative mechanism of glueball production in J/ψ radiative decay: the glueball G b could be formed via fusion of a pair of constituent gluons which are emitted whenever the constituent charm quark and anti quark in J/ψ transit into current charm quark and anti quark,and remained current charm quark pair annihilates into a photon. After a brief discussion of model parameters,we evaluate the partial width Γ J/ψ→G b +γ ,and compare it with the result from the mechanism where the glueball is produced via hadronazation of two emitted gluons in the J/ψ radiative decay.

关 键 词：J/Ψ 辐射衰变 组分胶子 胶球态 粲夸克偶素 产生机制 QCD 强子 

分 类 号：O571.3[理学—粒子物理与原子核物理]