Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-08-07
Eur.Phys.J.C56:75-80,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages
Scientific paper
10.1140/epjc/s10052-008-0642-2
The couplings $g_{\rho HH}$ of the $\rho$ 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 $g_{\rho HH}$ universality should be violated. The $\rho$-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 $\rho$. 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.
Huang Tao
Zuo Fen
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