%0 Journal Article
%T \rho D^*D^* vertex from QCD sum rules
%A Bracco
%A M. E.
%A Chiapparini
%A M.
%A Navarra
%A F. S.
%A Nielsen
%A M.
%J High Energy Physics - Phenomenology
%D 2007
%I 
%R 10.1016/j.physletb.2007.11.066
%X We calculate the form factors and the coupling constant in the $\rho D^* D^*$ vertex in the framework of QCD sum rules. We evaluate the three point correlation functions of the vertex considering both $\rho$ and $D^*$ mesons off--shell. The form factors obtained are very different but give the same coupling constant: $g_{\rho D^* D^*} = 6.6 \pm 0.31$. This number is 50% larger than what we would expect from SU(4) estimates.
%U http://arxiv.org/abs/0710.1878