2007/08/07 by Tao Huang, Fen Zuo
Physics and Astronomy · #Amplitude #Black Holes and Theoretical Physics #Geometry #Mathematical physics #Meson #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum electrodynamics #Quantum mechanics #Scalar (mathematics) #Scattering #Scattering amplitude #hep-ph
paper · pdf · doi:10.1140/epjc/s10052-008-0642-2
published as Eur.Phys.J.C56:75-80,2008 · 9 pages
arxiv created 2007/08/07 · openalex publication_date 2008/06/26 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The couplings gρHH of the ρ meson with any hadron H are calculated in a holographic dual of QCD where the Regge trajectories for mesons are manifest. The resulting couplings grow linearly with the exciting number of H, thus are far from universal. A simple argument has been given for this behavior based on quasi-classical picture of excited hadrons. It seems that in holographic duals with exact Regge trajectories the gρHH universality should be violated. The ρ-dominance for the electromagnetic form factors of H are also strongly violated, except for the lowest state, the pion. Quite unexpected, the form factor of the pion is completely saturated by the contribution of the ρ. The asymptotic behavior of the form factors are also calculated, and are found to be perfectly accordant with the prediction of conformal symmetry and pertubative QCD.