A QCD sum rules calculation of the ${\eta }_c{D}^{\ast }D$ and ${\eta }_c{D}_s^{\ast }{D}_s$ form factors and strong coupling constants

B. Osório Rodrigues, M. E. Bracco, C. M. Zanetti

We use the QCD sum rules for the three point correlation functions to compute the strong coupling constants of the meson vertices ${\eta }_c{D}^{\ast }D$ and ${\eta }_c{D}_s^{\ast }{D}_s$. We consider pertu…