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系统地计算 B0 → K0 π0 衰变过程的强子矩阵元 ,它包括领头阶因子化部分 ,αs 修正的硬胶子交换部分和软胶子交换部分 .其中软胶子交换部分 ,无论在量子色动力学 (QCD)因子化方法中 ,还是在微扰QCD中都不能进行计算 .用光锥QCD求和规则系统地计算了这部分贡献 ,并发现在该衰变道中软胶子交换部分与领头阶因子化部分以及αs 修正的硬胶子交换部分有相同的数量级 ,因此不能忽略 .最后计算了该衰变过程的分支比 ,计算结果与实验结果相一致
The Hadron matrix element for the decay process of B0 → K0 π0 is systematically calculated, which includes the lead order factorization part, αs modified hard gluon exchange part and soft gluon exchange part, in which the exchange part of soft gluon, (QCD) factorization method, or in the perturbation of QCD can not be calculated.Using the cone of light QCD summation rules to systematically calculate this part of the contribution and found that in the decay path part of the exchange with the leading order factorization Part and αs modified hard gluon exchange part of the same order of magnitude, and therefore can not be ignored.Finally, the branching ratio of the decay process is calculated, the calculated results are consistent with the experimental results