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Decay constants in soft wall AdS/QCD revisited
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Phenomenological AdS/QCD models, like hard wall and soft wall, provide hadronic mass spectra in reasonable consistency with experimental and (or) lattice results. These simple models are inspired in the AdS/CFT correspondence and assume that gauge/ gravity duality holds in a scenario where conformal invariance is broken through the introduction of an energy scale. Another important property of hadrons: the decay constant, can also be obtained from these models. However, a consistent formulation of an AdS/QCD model that reproduces the observed behavior of decay constants of vector meson excited states is still lacking. In particular: for radially excited states of heavy vector mesons, the experimental data lead to decay constants that decrease with the radial excitation level. We show here that a modified framework of soft wall AdS/QCD involving an additional dimensionfull parameter, associated with an ultraviolet energy scale, provides decay constants decreasing with radial excitation level. In this version of the soft wall model the two point function of gauge theory operators is calculated at a finite position of the anti-de Sitter space radial coordinate.
Forward citations
Cited by 5 Pith papers
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Holographic spectral functions of exotic spin-1 mesons
In a soft-wall holographic model with gluon condensate, the π1 hybrid and Zc tetraquark-like ground states both melt below the deconfinement temperature, with Zc melting slightly earlier and a larger condensate delayi...
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Heavy Quarkonium Spectrum and Decay Constants from a Neural-Network-Based Holographic Model
A neural-network-parametrized dilaton field reproduces the masses and leptonic decay constants of charmonium and bottomonium with 1.26% and 3.32% RMS errors, but only because those values were used as training data.
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Holographic quark masses and radiative decays of heavy vector mesons
The authors extract charm and bottom constituent quark masses and several quarkonium decay widths from AdS/QCD plus the Segre formula, obtaining order-of-magnitude agreement with experiment but no precise match.
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Thermodynamics of the Isospectral family of holographic vector mesons
Isospectral transformations in softwall AdS/QCD allow tuning the rho meson's decay constant to its experimental value of 226 MeV, producing a predicted melting temperature of 157 MeV from spectral function computation...
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Engineering Confining Dilatons: A WKB Inverse Problem in Holographic QCD
A WKB inversion of power-law Regge trajectories yields a non-quadratic holographic dilaton Φ(z)=(κz)^(2−α) that the authors then test on charmonium, bottomonium, and tetraquark candidates.
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