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.
出处
《高能物理与核物理》
CSCD
北大核心
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~~
关键词
五夸克态
高能质子-质子反应
核子激发态
pentaquark baryon Θ^＋, high energy proton-proton collision, nucleon resonance
