D⁎Dρ vertex from QCD sum rules

We calculate the form factors and the coupling constant in the D⁎Dρ vertex in the framework of QCD sum rules. We evaluate the three-point correlation functions of the vertex considering D, ρ and D⁎ mesons off-shell. The form factors obtained are very different but give the same coupling constant: gD⁎Dρ=4.3±0.9 GeV−1.