非因子化方法研究D→ππ,Kπ,KK衰变  

Research on D→ππ,Kπ,KK Decay with Nonfactorization Method

作　　者：王光怀[1] 刘晓静[1] 张丙新[2] 杨传顶[2] 郭义庆[2] 

机构地区：[1]吉林师范大学物理学院,吉林四平136000 [2]中国科学院高能物理所,北京100049

出　　处：《核电子学与探测技术》2009年第3期636-640,646,共6页Nuclear Electronics & Detection Technology

基　　金：吉林省教育厅科技计划项目基金(批准号:2006016)

摘　　要：首次用QCD求和规则系统地计算D→ππ,Kπ,KK衰变过程的强子矩阵元,它包括领头阶因子化部分,as修正的硬胶子交换部分和软胶子交换部分。计算发现在D→ππ,Kπ,KK衰变中的一些衰变道软胶子交换部分贡献相当大,甚至超过领头阶因子化部分以及as修正的硬胶子交换部分的贡献。最后计算了这些衰变过程的分支比,大多数的衰变道的计算结果与实验数据相一致,我们的计算结果比因子化方法的计算结果有较大改进,但部分衰变道的计算结果与实验相比还有一定偏差。We calculated systematically the hadronic matrix elements of D→ππ,Kπ,KK decays with Iight cone OCD sum rules firstly, which are included the contributions of factorization in the leading order, the hard gluon exchange. We can find the contributions of soft gluon exchange are noticeable, and they exceed the contributions of factorization of leading order and the hard gluon exchange of αs corrections. In the final, we calculated the branching ratio of these decays. The calculation results of the most decay channels are in accordance with the experimental data, which are improved largely with the approach of factorization, but the theoretical prediction of part decay channels have a little warp with the experiment.

关 键 词：D介子非轻子衰变 非因子化方法 强子矩阵元 分支比 

分 类 号：O572[理学—粒子物理与原子核物理]