Explicit Confinement Effect on the Helicity Amplitudes of the Low-Lying Nucleon Resonances  

作　　者：DONGYu-Bing HEJun 

机构地区：[1]InstituteofHighEnergyPhysics,TheChineseAcademyofSciences,P.O.Box918,Beijing100039,China

出　　处：《Communications in Theoretical Physics》2003年第3X期345-348,共4页理论物理通讯（英文版）

摘　　要：Calculations of helicity amplitudes for the low-lying nucleon resonances are displayed based on a non-relativistic constituent quark model with a harmonic oscillator confinement. The explicit effect of quark confinement is shown. Our results show that the effect plays sizable role on some transition amplitudes of S11 (1535) and D13(1520) resonances. The effect on the △(1232) transition amplitudes is less than 10%. However, the effect on the Roper resonance is remarkable but is inconclusive.

关 键 词：权夸克模型近似 约束效应 谐振跃迁 螺旋性振幅 QCD 量子色动力学 核子结构函数 

分 类 号：O572.33[理学—粒子物理与原子核物理] O572.243[理学—物理]