夸克质量对正负电子湮灭中遍举过程的影响  

The Effect of Quark Mass on the Inclusive Process in e^+e^- Annihilation

作　　者：祁烁[1] 王丽芝[1] 刘魁勇[2] 

机构地区：[1]沈阳化工学院数理系,辽宁沈阳110142 [2]辽宁大学

出　　处：《沈阳理工大学学报》2008年第2期87-90,共4页Journal of Shenyang Ligong University

摘　　要：实验观测到遍举过程的产生截面比NRQCD框架下的理论计算值大一个数量级,为解决理论与实验的尖锐矛盾,本文在三种方案下考虑夸克质量改变对正负电子湮灭中双粲夸克对的遍举过程的影响.第一种方案,选取固定长程矩阵元;第二种方案,采用线性势模型计算长程矩阵元;第三种方案,由实验抽取长程矩阵元.发现在第一种方案下,夸克质量改变对遍举过程的产生截面有显著影响.在第二种方案和第三种方案下,遍举过程的截面随夸克质量的减小而减小.表明研究夸克质量对遍举过程的影响是有意义的.The experimental data of the cross section of inclusive process may be an order of magnitude larger than the NRQCD predictions . In order to solve the large discrepancy between theory and experiment, in this paper, the effect of quark mass on the inclusive process in e^＋e^- annihilation is investigated under three schemes. The first scheme, the fixed long- distance matrix is chosen. The second scheme, the long-distance matrix is calculated through linear potential model. The third scheme, the fixed long -distance matrix is extracted from the experimental data. In the first scheme, the cross sections of the inclusive processes will vary significantly with the quark mass changing. In the second and the third scheme, the cross section of the inclusive process will decrease with the quark mass decreasing. These investigations show that the quark mass effect can be significant for the inclusive process.

关 键 词：非相对论量子力学 粲夸克偶素 遍举过程 

分 类 号：O412[理学—理论物理]