2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/193842We calculate the form factors and the coupling constant in the $ρD^* D^*$ vertex in the framework of QCD sum rules. We evaluate the three point correlation functions of the vertex considering both $ρ$ and $D^*$ mesons off--shell. The form factors obtained are very different but give the same coupling constant: $g_{ρD^* D^*} = 6.6 \pm 0.31$. This number is 50% larger than what we would expect from SU(4) estimates.9 pages, 6 eps figuresHigh Energy Physics - Phenomenologytext