NN S-Wave Elastic Cross Section and Possible Bound States in a Constituent Quark Model  

作　　者：庞侯荣 平加伦 王凡 

机构地区：[1]Department of Physics, Southeast University, Nanjing 210094 [2]Department of Physics, Nanjing Normal University, Nanjing 210097 [3]Joint Center of Particle, Nuclear Physics and Cosmology, and Department of Physics Nanjing University, Nanjing 210093

出　　处：《Chinese Physics Letters》2008年第9期3192-3195,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 10505006, 10375030, 10775072 and 90503011.

摘　　要：In the framework of a chiral constituent quark model, considering the contributions of π annihilation and one-gluon annihilation, the proton-antiproton s-wave elastic scattering cross section experimental data can be reproduced by adjusting properly one-gluon annihilation coupling constant. After fixing the model parameters, we perform a dynamical calculation for all possible s-wave nucleon-antinucleon states. The results show that there is no s-wave bound state as indicated by a strong enhancement at threshold of pp in J/φ and B decay.In the framework of a chiral constituent quark model, considering the contributions of π annihilation and one-gluon annihilation, the proton-antiproton s-wave elastic scattering cross section experimental data can be reproduced by adjusting properly one-gluon annihilation coupling constant. After fixing the model parameters, we perform a dynamical calculation for all possible s-wave nucleon-antinucleon states. The results show that there is no s-wave bound state as indicated by a strong enhancement at threshold of pp in J/φ and B decay.

分 类 号：O572[理学—粒子物理与原子核物理]