$D^{*}D Ï$ vertex from QCD sum rules
arXiv:1003.2604 · doi:10.1016/j.nuclphysa.2011.01.001
Abstract
We calculate the form factors and the coupling constant in the $D^{*}D Ï$ vertex in the framework of QCD sum rules. We evaluate the three point correlation functions of the vertex considering both $ D $ and $ Ï$ mesons off--shell. The form factors obtained are very different but give the same coupling constant: $g_{D^{*}D Ï} = 4.1 \pm 0.1$ GeV$^{-1}$.
9 pages, 6 figures