2005/01/20 by Sungho Hong, Hong, Sungho, Sukjin Yoon +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #Nuclear Theory (nucl-th) #hep-lat #hep-ph #hep-th #nucl-th
paper · pdf · doi:10.48550/arxiv.hep-ph/0501197
4 pages, 5 figures (v3, added referencing, small adjustments to preliminary and final remarks, content unchanged.)
arxiv created 2005/01/24 · arxiv updated 2009/12/01
We argue that in generic AdS/QCD models (confining gauge theories dual to string theory on a weakly-curved background), the couplings grho HH of any rho meson to any hadron H are quasi-universal, lying within a narrow band near m(rho)2/f(rho). The argument relies upon the fact that the rho is the lowest-lying state created by a conserved current, and the detailed form of the integrals which determine the couplings in AdS/QCD. Quasi-universality holds even when rho-dominance is violated. The argument fails for all other hadrons, except the lowest-lying spin-two hadron created by the energy-momentum tensor. Explicit examples are discussed.