Analysis of the vertices $D^*D_sK$, $D^*_sDK$,$D_0D_sK$ and $D_{s0}DK$ with the light-cone QCD sum rules

Details Analysis of the vertices $D^*D_sK$, $D^*_sDK$,$D_0D_sK$ and $D_{s0}DK$ with the light-cone QCD sum rules Analysis of the vertices $D^*D_sK$, $D^*_sDK$,$D_0D_sK$ and $D_{s0}DK$ with the light-cone QCD sum rules

2006-05-31

arxiv.org/abs/hep-ph/0606002v2

Phys.Rev.D74:014017,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

31 pages, 21 figures, 2 tables, Second version

Scientific paper

10.1103/PhysRevD.74.014017

In this article, we analyze the vertices $D^*D_sK$, $D^*_sDK$, $D_0D_sK$ and $D_{s0}DK$ within the framework of the light-cone QCD sum rules approach in an unified way. The strong coupling constants $G_{D^*D_sK}$ and $G_{D^*_sDK}$ are important parameters in evaluating the charmonium absorption cross sections in searching for the quark-gluon plasmas, our numerical values of the $G_{D^*D_sK}$ and $G_{D^*_sDK}$ 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 $c\bar{u}$ and $c\bar{s}$ mesons respectively, and calculate the strong coupling constants $G_{D_0 D_s K}$ and $G_{D_{s0} D K}$ with the vector interpolating currents. The numerical values of the scalar-$D_sK$ and -$DK$ coupling constants $G_{D_0 D_s K}$ and $G_{D_{s0} D K}$ 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 $G_{D^*D_sK}$, $G_{D^*_sDK}$, $G_{D_0D_sK}$ and $G_{D_{s0}DK}$ on the non-perturbative parameter $a_4$ of the twist-2 $K$ meson light-cone distribution amplitude.

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