2007/10/09 by Mirian E. Bracco, M. E. Bracco, M. Chiapparini +2
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1016/j.physletb.2007.11.066
published as Phys.Lett.B659:559-564,2008 · 9 pages, 6 eps figures
arxiv created 2007/10/09 · openalex publication_date 2007/12/04 · arxiv updated 2009/12/01 · openalex created_date 2022/05/12 · openalex updated_date 2026/08/02
We 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: gρD∗D∗=6.60±0.31. This number is 50% larger than what we would expect from SU(4) estimates.