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.
出处
《核电子学与探测技术》
CAS
CSCD
北大核心
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)
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
D meson nonleptonic decays, non-factorization method, hadronic matrix element, branching ratio
