Investigation of the D (s) (*) D-s eta ((')) and B (s) (*) B-s eta ((')) vertices via QCD sum rules

The strong-coupling constants among mesons are very important quantities as they can provide useful information on the nature of strong interaction among hadrons as well as the QCD vacuum. In this article, we investigate the strong vertices of the D (s) (*) D (s) eta ((')) and B (s) (*) B (s) eta ((')) in the framework of the QCD sum rule approach choosing the eta or D (s) (B (s) ) meson as an off-shell state. We obtain the results , , and for the strong-coupling constants under consideration, which can be checked in future experiments