项目名称: 在4.0GeV以上pipipsip衰变模式的研究和Zc的寻找
项目编号: No.11475169
项目类型: 面上项目
立项/批准年度: 2015
项目学科: 数理科学和化学
项目作者: 严亮
作者单位: 中国科学技术大学
项目金额: 86万元
中文摘要: 粲夸克偶素是一个重介子家族,这些粒子均由一对正反粲夸克所组成。粲偶素作为二体系统因其结构简单,生成截面大以及在进行唯象分析时适合于采用非相对论性近似与微扰处理而成为研究夸克间力-强相互作用的理想场所。粲偶素粒子实验研究对于了解夸克间力与重夸克偶素衰变机制的重要意义由于量子色动力学的研究出现的新进展得到了新的强调。近期国际上发现了粲偶素混杂态的存在,同时通过粲偶素混杂态的衰变,发现了多夸克态存在的依据。利用在4.0GeV以上BESIII积累的对撞数据,通过pipipsip的衰变末态的研究,可以给出pipipsip的lineshape,对于理解4.0GeV以上的charmonium-like的粒子态,有着非常重要的作用。对于pi和psip不变质量谱的研究,对于多夸克态的理解和检验,是国际上非常重要的研究热点问题。
中文关键词: 北京谱仪;粲偶素;数据分析
英文摘要: Charmounim is an heavy meson family. These particle are all formed by c and cbar quark.Charmounium is a perfect place to study the interaction between quarks, because of their two body system and large cross section and the using of non-relativity approximation and perturbation. It is very important that the study of Charmounim particles can contribute to understanding the force between the quarks and the heavy quark decay mechanism, because of the new progress in QCD.Recently,the discovery of charmonium hybrids may be the most exciting goal of the current studies of charmounium system. By the decay of charmounium hybrids,some candidates for multiquark meson are found. Based on the collider data above 4.0 GeV in BESIII, these states should be accessible through pipipsip decay mode. We could measure the pipipsip cross section, the fit the lineshape to understand the charmounium-like states. To study the invariant mass of pi and psip, it is a focus on understanding and testing the multiquark meson.
英文关键词: BESIII;Charmonium;Data analysis