ρD^*D^* vertex from QCD sum rules

Details ρD^*D^* vertex from QCD sum rules ρD^*D^* vertex from QCD sum rules

2007-10-09

arxiv.org/abs/0710.1878v1

Phys.Lett.B659:559-564,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 6 eps figures

Scientific paper

10.1016/j.physletb.2007.11.066

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.

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