A QCD sum rules calculation of the $J/ψD_s^* D_s$ strong coupling constant

In this work, we calculate the form factors and the coupling constant of the strange-charmed vertex $J/ψD_s^* D_s$ in the framework of the QCD sum rules by studying their three-point correlation functions. All the possible off-shell cases are considered, $D_s$, $D_s^*$ and $J/ψ$, resulting in three different form factors. These form factors are extrapolated to the pole of their respective off-shell mesons, giving the same coupling constant for the process. Our final result for the $J/ψD_s^* D_s$ coupling constant is $g_{J/ψD^*_s D_s} = 4.30^{+0.42}_{-0.37}\text{GeV}^{-1}$.

No reviews yet.

No comments yet.