In this work, we calculate the form factors and the coupling constant of the strange-charmed vertex J/ψDs∗Ds in the framework of the QCD sum rules by studying their three-point correlation functions. All the possible off-shell cases are considered, Ds, Ds∗ 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/ψDs∗Ds coupling constant is gJ/ψDs∗Ds=4.30−0.37+0.42GeV−1.
@article{arxiv.1501.03088,
title = {A QCD sum rules calculation of the $J/\psi D_s^* D_s$ strong coupling constant},
author = {B. Osório Rodrigues and M. E. Bracco and M. Chiapparini and A. Cerqueira},
journal= {arXiv preprint arXiv:1501.03088},
year = {2015}
}