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通过QCD求和规则研究D+→K-0l+lν衰变过程,计算D→K跃迁形状因子,通过构造新的关联函数,消除了twist-3波函数的不确定性对计算结果的影响,使计算结果更精确.计算得到的分支比与实验数据一致.
The decay process of D + → K-0l + lν is studied by QCD summing rule, and the shape factor of D → K transition is calculated. By constructing a new correlation function, the influence of the uncertainty of twist-3 wave function on the calculation result is eliminated, The result is more accurate.The calculated branch ratio is consistent with the experimental data.