Abstract :
In this article, we study the vertices D∗D∗P, D∗DV and DDV with the light-cone QCD sum rules. The strong coupling constants gD∗D∗P, gD∗DP, fD∗DV, fD∗D∗V, gDDV and gD∗D∗V play an important role in understanding the final-state interactions in the hadronic B decays. They relate to the basic parameters g, λ and β in the heavy quark effective Lagrangian respectively. Our numerical values of the g, β and λ are much smaller than most of the existing estimations. If the predictions from the light-cone QCD sum rules are robust, the final-state interaction effects maybe overestimated in the hadronic B decays.
