退耦近似在重味夸克分布函数标度演化中的应用  

Application of decoupling approximation in scaling evolution of heavy quark distribution functions

作　　者：于思贺 李刚[1] 宋昴[1] YU Sihe;LI Gang;SONG Mao(School of Physics and Material Science,Anhui University,Hefei 230601,China)

机构地区：[1]安徽大学物理与材料科学学院

出　　处：《安徽大学学报（自然科学版）》2019年第1期66-71,共6页Journal of Anhui University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(11305001)

摘　　要：核子中存在非微扰的intrinsic重味夸克FOCK态是量子色动力学的一个严格理论预言,对这个预言的研究是当前重味夸克物理中的一个重要课题.采用退耦近似,忽略intrinsic重味夸克与轻味夸克及胶子的混合贡献,可把异常复杂的重整化群演化方程近似处理为通常的胶子、轻味夸克、extrinsic重味夸克演化方程及intrinsic重味夸克非单态演化方程.详细分析intrinsic粲夸克概率为1%,3.5%情况下退耦近似演化的计算结果,对退耦近似的可信度进行详细分析,给出退耦近似下任意概率粲夸克分布.The existence of non-perturbative intrinsic heavy quark FOCK states in nucleon is a strict prediction of quantum chromodynamics on which the research is currently an important topic in heavy quark physics.With decoupling approximation,ignoring the mixed item of intrinsic heavy quark and gluon,the mixed item of intrinsic heavy quark and light quark,the extremely sophisticated renormalization group evolution equation can be approximated to the light quark,extrinsic heavy quark and gluon standard evolution equation and intrinsic heavy quark non-singlet evolution equation.This paper analyzed the decoupling approximation results in the two cases of intrinsic charm quark probabilityoω=1%,ω=3.5%,The reliability of decoupling approximation was studied in detail.The arbitrary probability charm quark distribution with decoupling approximation was given.

关 键 词：退耦近似 重味夸克 DGLAP方程 

分 类 号：O572.25[理学—粒子物理与原子核物理]