用QCD理论研究D→πl■(l=e,μ)衰变过程

Research on D→π■(l=e,μ) Decay with QCD Theory

用光锥QCD求和规则计算D→πl^vl(l=e,μ)衰变过程的分支比。通过计算D→π跃迁形状因子fD+π(q2)和计算形状因子~fDπ(q2),就能考虑轻子(e,μ)质量对分支比的影响,可分别计算D→πe^ve,D→πμ~vμ衰变过程的分支比,并把理论计算与最近实验结果进行了比较,发现计算的分支比在实验数据误差范围之内。

The brunch ratios of D→πlvl（l=e,μ）decay is researched by light cone QCD sum rules.By calculating the form factor f＋Dπ（q2）and fDπ（q2）of D→π,we consider the effect of the lepton mass on the branching rations of the D→π~eve,D→π~μvμ decay.The brunch ratios are consistent with the experimental data.