Couplings of the Rho Meson in a Holographic dual of QCD with Regge Trajectories

Understand

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.