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On the Couplings of the Rho Meson in AdS/QCD

Sungho Hong·Sukjin Yoon·Matthew J. Strassler
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Abstract

We argue that in generic AdS/QCD models (confining gauge theories dual to string theory on a weakly-curved background), the couplings g_{rho 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.

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Sungho Hong, Sukjin Yoon, Matthew J. Strassler. 2005-01-24. On the Couplings of the Rho Meson in AdS/QCD. https://arxiv.org/abs/hep-ph/0501197

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