D^+→■~0π^+的衰变过程

D^+→■~0π^+Decay

用光锥QCD求和规则计算D+→■-0π+衰变过程的强子矩阵元,包括领头阶因子化部分、αs修正的硬胶子和软胶子交换部分.计算结果表明,在D+→■-0π+衰变中,软胶子交换部分不能忽略.并计算了该衰变过程的分支比,计算结果与实验数据相符.

We calculated systematically the hadronic matrix elements of D^＋ → K^-0 π^＋ decays with light cone QCD sum rules firstly, which included the contributions of factorization in the leading order, the hard gluon exchange in the next leading order, and the soft-gluon exchange in the power order. We can find that the contributions of soft-gluon exchange can not be neglected. Finally, we calculated the branching ratio of the decays, and the calculation results are in accordance with the experimental data.