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In this paper, the strong form factors and coupling constants of D s DK * and D s D * K * vertices are investigated within the three-point QCD sum rules method with and without the SU f (3) symmetry. In this calculation, the contributions of the quark-quark, quark-gluon, and gluongluon condensate corrections are considered. As an example of specific application of these coupling constants, the branching ratio of the hadronic decay B + → K * 0 π + is analyzed based on the one-particle-exchange which is one of the phenomenological models. In this model, B decays into a D s D * intermediate state, and then these two particles exchange a D(D * ) producing the final K * and π mesons. In order to compute the effect of these interactions, the D s DK * and D s D * K * form factors are needed.

In this article, the three-point QCD sum rules are used to compute the strong coupling constants of vertices containing the strange bottomed (charmed) mesons with the pion. The coupling constants are calculated when both the bottom (charm) and the pion states are off-shell. A comparison of the obtained results of the coupling constants with existing predictions is also made.

The structure of the Ds1(2460) meson has not yet been exactly known in the quark model. Considering the Ds1 meson as a conventional [Formula: see text] meson, we investigate the strong form factors and coupling constants gDs1D*K and [Formula: see text] in the framework of the three point QCD sum rules. Any future experimental measurement on these form factors as well as coupling constants gDs1D*K and [Formula: see text] and their comparison with the obtained results in the present work can give considerable information about the structure of this meson.