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On the Couplings of Vector Mesons in AdS/QCD | | Sungho Hong
; Sukjin Yoon
; Matthew J. Strassler
; | | Date: |
10 Sep 2004 | | Subject: | hep-th hep-ph | | Affiliation: | U. Pennsylvania and U. Washington), Sukjin Yoon (U. Washington) and Matthew J. Strassler (U. Washington | | Abstract: | We address, in the AdS/CFT context, the issue of the universality of the couplings of the rho meson to other hadrons. Exploring some models, we find that generically the rho-dominance prediction f_
ho g_{
ho H H}=m_
ho^2 does not hold, and that g_{
ho H H} is not independent of the hadron H. However, we prove that, in any model within the AdS/QCD context, there are two limiting regimes where the g_{
ho H H}, along with the couplings of all excited vector mesons as well, become H-independent: (1) when H is created by an operator of large dimension, and (2) when H is a highly-excited hadron. We also find a sector of a particular model where universality for the rho coupling is exact. Still, in none of these cases need it be true that f_
ho g_
ho=m_
ho^2, although we find empirically that the relation does hold approximately (up to a factor of order two) within the models we have studied. | | Source: | arXiv, hep-th/0409118 | | Services: | Forum | Review | PDF | Favorites | |
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