Research on D→KlV_l(l=e,μ) Decay

The D→KlVl(l=e,μ) decay was researched by light cone QCD sum rules. The form factor f+DK(q2) of D→K was calculated by choosing a new correlative function, and a new form factor fDK(q2) was also calculated, so the effect of the lepton mass on the branching ratios can be found. The branch ratios of the D→KeVe, D→KμVμ decay were calculated and the calculation result is more precisely. The branch ratios are consistent with the experimental data.