质子-质子碰撞产生Θ^+五夸克态过程中N~*(1710)的贡献  

N*(1710) Contribution to the θ+ Production Cross Sections in p-p Collisions

作　　者：李贵君[1] 陈洪[1] 邹冰松 姜焕清[1] 黄淑一[1] 

机构地区：[1]西南大学物理学院,重庆400715 [2]中国科学院高能物理研究院

出　　处：《高能物理与核物理》2006年第6期542-547,共6页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(10435080;10475089;10575083)中国科学院重点方向性项目(KJCX2-SW-N02)资助~~

摘　　要：在相对论的框架下,基于有效拉氏量,在单π和单ρ介子交换的机制下,我们推导了高能质子-质子碰撞过程中五夸克态产生过程反应截面．利用已知的经验耦合常数和顶角形状因子,研究了 N*(1710)核子激发态对反应截面的影响,发现ρ介子交换在这些过程中起主导作用．包括中间核子态 N*(1710)在质心能量为4GeV附近,使反应截面增大几十倍,其贡献是不可忽视的．In this paper we derive the Θ production cross section in high energy proton-proton collisions in the relativistic framework through using effective hadronic couplings. Both the nucleon and N^＊ （1710） propagations are taken into account in the intermediate states. The one π and one ρ exchange mechanisms are considered and the commonly accepted coupling constants and form factors are used in the calculation. We find that ρ exchange is dominant in these processes and the N^＊ （1710） propagation in the intermediate state is important,which increases the Θ production cross section by a factor of a few tens at center of mass energy 4GeV.

关 键 词：五夸克态 高能质子-质子反应 核子激发态 

分 类 号：O572.33[理学—粒子物理与原子核物理]