BESⅢ上的η_c物理  

η_c Physics at BESⅢ

作　　者：张志清[1] 房双世[2] 魏代会[3] 祝玉灿[4] 鲁公儒[1] 

机构地区：[1]河南师范大学,新乡453002 [2]中国高等科学技术中心,北京100080 [3]广西师范大学,桂林541004 [4]中国科学院高能物理研究所,北京100039

出　　处：《高能物理与核物理》2004年第6期569-575,共7页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 ( 199914 82 )资助~~

摘　　要：介绍了当前对 ηc 衰变的研究状况 ,即理论上还不能很好的描述 ηc 的衰变机制 ,实验上也需要更大的样本对 ηc 衰变进行深入的研究 .基于在BESⅢ上预期一年所能获取的J ψ和 ψ′事例数 ,集中讨论了在BESⅢ上可进行的 ηc 物理的研究 .主要包括 ηc 衰变到不同末态分支比的测量 ,新衰变模式的寻找 ,质量和宽度的精确测量以及稀有衰变的寻找 ,并对 η′cAn introduction for η c physics research is presented in this paper, which shows that the meachnism of η c decays can't be well described by current theoretical models and detailed experimental measurements need to be done with larger η c sample. Based on the expected J/ψ and ψ′ events taken with the planed BESⅢ detector in one year, the η c physics researches are discussed extensively, including the measurements of branching fractions of different final states, the search for new decay modes, precision measurements of mass and width, and the search for rare decays. At last, the study of η′ c decays is also discussed briefly.

关 键 词：BESⅢ探测器 ηc衰变 分支比 CP破坏 高能物理学 

分 类 号：O565[理学—原子与分子物理]