关于Reggeon的结构  

On the Structure of Reggeon

作　　者：彭宏安[1] 何祯民[2] 高永华[3] 阎占元[4] 段春贵[2] 

机构地区：[1]北京大学物理学院,北京100871 [2]河北师范大学物理学院,石家庄050016 [3]石家庄学院物理研究所,石家庄050801 [4]华北电力大学应用物理系,保定071003

出　　处：《高能物理与核物理》2005年第4期337-344,共8页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(10175074);河北省自然科学基金(103143)资助~~

摘　　要：从强子组分夸克具有结构的观点出发,根据高能强作用软过程中的最大非微扰强作用反应假定,提出了关于Reggeon(R)的结构模型.高能时对撞强子中的一对组分夸克-反夸克在最大反应下有一定的几率先分解为非微扰胶子和旋量团(反旋量团).此旋量团对将进一步演化而放射出一系列的非微扰胶子(和夸克对)并最终湮没.将这种过程与其逆向(厄米共轭)过程并合,就可得出有关的R的场论结构图象.它是以旋量团为竖线,胶子为横线的一系列切割梯形图之和所代表.本文在系统能量大而动量转移很小的多重Regge运动学区间和只保留logs的领头阶近似下,计算了这组切割梯形图相应的散射振幅,求出了它们的总和,得出了与轻夸克介子对应的典型Regge极点轨迹的简洁表达式,对结果进行了简单的讨论.Starting from the point-view that the constituent quark has its own inner structure and according to the hypothesis of the maximum non-perturbative strong interaction reaction which should be obeyed in high energy strong-soft processes, we propose a structure model of the Reggeon(R). In such processes, a pair of constituent quark-antiquark in colliding hadrons would individually desociate with certain probability into a non-perturbative gluon and a spinor-like cluster firstly. The spinor-like clusters will further emit non-perturbative gluons and then annihilate each other. Corresponding to such mechanism the relevant structure of R in the field theory can be represented by summing over a set of cutting ladder diagrams, where the vertical lines are the propagators of spinor-like clusters and the rungs are non-perturbative gluons. In the multi-Regge region where the energy of the system is very large and its momentum transfer |t| is very small, under the approximation that only the leading order logarithm terms of s are preserved, the scattering amplitudes for these cutting ladder diagrams are derived and summed. Thus, a compact formula of the typical Regge pole trajectory of mesons which are composed of light quarks is obtained.

关 键 词：非微扰 结构模型 动量转移 系统能量 散射振幅 强作用 梯形图 旋量 夸克对 胶子 运动学 表达式 轻夸克 组分 强子 反应 高能 切割 共轭 分解 几率 场论 近似 区间 极点 介子 

分 类 号：O572.243[理学—粒子物理与原子核物理]