A QCD sum rules calculation of the J/ψDₛ* Dₛ strong coupling constant

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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/ψD*ₛ Dₛ = 4.30⁺⁰.⁴²₋₀.₃₇GeV⁻¹.