非因子化方法研究D^0→■~0π~0衰变

Research on D^0→(?)~0π~0 Decay with Nonfactorization Method

用光锥 QCD 求和规则系统地计算 D^0→~0π~0衰变过程的强子矩阵元,它包括领头阶因子化部分,a_5修正的硬胶子交换部分和软胶子交换部分的贡献.计算发现在 D^0→~0π~0衰变中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α_4 修正的硬胶子交换部分的贡献.最后计算了该衰变过程的分支比,其计算结果与实验数据相一致.

We calculated systematically the hadronic matrix elements of D^0→^-K^0π^0 decays with light cone OCD sum rules firstly, which are included the contributions of factorization in the leading order, the hard gluon exchange. We can find the contribution of soft gluon ex- change is noticeable. In the final, we calculated the branching ratio of the decays channel. The calculation results of the decay is in accordance with the experimental data.