D→Klν~<SUB>1</SUB>(l=e,μ)衰变过程研究

D→Klν~₁(l=e,μ)衰变过程研究

摘要: 用光锥QCD求和规则研究D→Klν~₁(l=e,μ)衰变过程，通过构造适当的关联函数，既计算了D→K跃迁形状因子 f_DK⁺(q²)，又计算了形状因子中新的项f_DK^~(q²)，发现了轻子(e,μ)质量对分支比的影响。这样能分别计算D→Kev_e和D→Kμv_μ衰变过程的分支比，并使计算结果更为精确。计算出的分支比与实验数据在误差范围内一致。

Abstract: The D→KlAKν~Dl(l=e,μ) decay was researched by light cone QCD sum rules. The form factor f+DK(q2) of D→K was calculated by choosing a new correlative function, and a new form factor AKf~DK(q2) was also calculated, so the effect of the lepton mass on the branching ratios can be found. The branch ratios of the D→KeAKν~De, D→KμAKν~Dμ decay were calculated and the calculation result is more precisely. The branch ratios are consistent with the experimental data.