Analysis of the vertices D*DsK, Ds*DK, D0DsK, and Ds0DK with the light-cone QCD sum rules

In this article, we analyze the vertices (DDsK)-D-*, (DsDK)-D-*, D0DsK, and Ds0DK within the framework of the light-cone QCD sum rules approach in an unified way. The strong coupling constants G(D)(*)D(s)K and G(Ds)(*)DK are important parameters in evaluating the charmonium absorption cross sections in searching for the quark-gluon plasmas. Our numerical values of the G(D)(*)D(s)K and G(Ds)(*)DK are compatible with the existing estimations although somewhat smaller; the SU(4) symmetry breaking effects are very large, about 60%. For the charmed scalar mesons D-0 and D-s0, we take the point of view that they are the conventional c (u) over bar and c (s) over bar mesons, respectively, and calculate the strong coupling constants G(D0)D(s)K and G(Ds0)DK with the vector interpolating currents. The numerical values of the scalar-DsK and scalar-DK coupling constants G(D0)D(s)K and G(Ds0)DK are compatible with the existing estimations-the large values support the hadronic dressing mechanism. Furthermore, we study the dependence of the four strong coupling constants G(D)(*)D(s)K, G(Ds)(*)DK, G(D0)D(s)K, and G(Ds0)DK on the nonperturbative parameter a(4) of the twist-2 K meson light-cone distribution amplitude.