核物质中粲偶素粒子的形成与压低(英文)  

Charmonium Formation and Suppression in Nuclear Matter

作　　者：徐佳君[1] 王佳[1] 庄超[1] 庄鹏飞[1] 

机构地区：[1]清华大学物理系,北京100084

出　　处：《高能物理与核物理》2005年第5期442-446,共5页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(19925519,10135030);国家重大基础研究发展规划项目(G2000077407)资助~~

摘　　要：用微扰方法系统求解了c c 各态之间的耦合Schroedinger方程,讨论了粲粒子的形成时间和核吸收的关联.通过计算J/Ψ及Ψ′在不同核子-核过程中的压低并与实验结果比较,发现形成时间对J/Ψ,特别是Ψ′的核吸收过程有重要的影响.The coupling Schrodinger equations describing the evolution of cc over-bar states in nuclear matter are analytically and systematically solved via perturbation method, and the correlation between charmonium formation and nuclear absorption is investigated. After calculating J/ψ and ψ' suppression in nucleon-nucleus collisions and comparing with experiment data, it is found that the formation time effect plays an important rule in charmonium suppression, especially in ψ' suppression.

关 键 词：粲偶素粒子 核物质 微扰法 耦合Schroedinger方程 吸收过程 

分 类 号：O571[理学—粒子物理与原子核物理]