介子中的胶子自由度  

Gluonic Degree of Freedom in Mesons

作　　者：刘朝峰[1] 刘觉平[1] 

机构地区：[1]武汉大学物理学系,武汉430072

出　　处：《武汉大学学报（自然科学版）》1999年第3期321-324,共4页Journal of Wuhan University(Natural Science Edition)

摘　　要：在假定有质量的组分胶子是介子的构成子之一的基础上， 根据 Ｌｏｒｅｎｔｚ 群与 Ｓ Ｕ（ Ｎｃ） 色群的分析，构造了基态 Ｊ Ｐ＝ １－ 介子的波函数， 分析了基态１－ 介子中 ρ±、κ±、ρ０ 、ω和 ф介子的磁矩与自旋结构（即夸克、反夸克与组分胶子对介子自旋的贡献）．得到了关于 ρ±、κ± 介子的磁矩和自旋朗德因子ｇｓ 的限制条件以及关于基态１－ 介子各组成子（夸克、反夸克或组分胶子）所携带的介子自旋的份额ｒ 的限制条件，The non\|perturbative effect of gluons in a bound state is assumed to be simulated by the massive constituent gluons, and then the general wave functions of the usual J P=1 - mesons are constructed to be a superposition of a qq state and qqg state through an analysis of the Lorentz\|group and the SU (N c ) color group representations. Based on this, the magnetic moments as well as the spin structure (i.e. the contributions of quark, antiquark and gluon to the spin of a meson) of ρ ±、κ *± 、ρ 0、 ω and ф mesons are investigated. A constraint condition for the spin Lande g\|factor of the charged 1 - mesons is obtained, and furthermore, a constraint condition for the magnitudes of the contributions of the valence quark, antiquark and the constituent gluon to the spin of a vector meson is then derived on the same basis. The effect of the constituent gluon on the meson spin is found to be significant.

关 键 词：组分胶子 自旋结构 磁矩 介子 胶子 自由度 

分 类 号：O572.33[理学—粒子物理与原子核物理]