$D^{*}D ρ$ vertex from QCD sum rules

B. Osorio Rodrigues, M. E. Bracco, M. Nielsen, F. S. Navarra

Published 2010-03-12Version 1

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