$D^{*}D ρ$ vertex from QCD sum rules

We calculate the form factors and the coupling constant in the $D^{*}D ρ$ vertex in the framework of QCD sum rules. We evaluate the three point correlation functions of the vertex considering both $D$ and $ρ$ mesons off--shell. The form factors obtained are very different but give the same coupling constant: $g_{D^{*}D ρ} = 4.1 \pm 0.1$ GeV$^{-1}$.

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