瞬子效应在0^(++)胶球的QCD求和规则中的作用  

Effect of Instanton on the QCD Sum Rule of 0^(++) Glueball

作　　者：张珠峰[1] 金洪英[1] 

机构地区：[1]浙江大学浙江近代物理中心,杭州310027

出　　处：《高能物理与核物理》2004年第3期245-249,共5页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金;浙江省自然科学基金资助~~

摘　　要：利用包含瞬子效应的QCD求和规则计算了 0 + + 胶球的质量上限 ,结果为 1 3GeV .还探讨了变动瞬子参量时对QCD求和规则的影响 ,发现包含瞬子修正的QCD求和规则在瞬子大小为 1In this paper, we investigate the instanton effects to the mass of 0 ++ glueball by QCD sum rule approach. The instantons are assummed to be free from each other and be with definite density varying with their sizes. We find the upper bound of mass of the 0 ++ glueball is 1 3GeV and very possibly the mass can be as low as 1GeV. Besides, the instanton effects greatly improve the stability of the sum rule and overtake the contribution of quarks and gluons condensate. The centre size of instantons at 1/3fm can give the stablest sum rule.

关 键 词：瞬子效应 胶球 QCD求和规则 非阿贝尔规范场 量子色动力学 高能物理学 

分 类 号：O572.3[理学—粒子物理与原子核物理]