Holographic glueball structure
Nov, 2007Citations per year
Abstract: (arXiv)
We perform a systematic analysis of the scalar glueball correlation functions in both the hard-wall and dilaton soft-wall approximations to the holographic QCD dual. The dynamical content of the holographic correlators is uncovered by examining their spectral density and by relating them to the operator product expansion, a dilatational low-energy theorem and a recently suggested two-dimensional power correction associated with the short-distance behavior of the heavy-quark potential. This approach provides holographic estimates for the three lowest-dimensional gluon condensates, the two leading moments of the instanton size distribution in the QCD vacuum and an effective UV gluon mass. A remarkable complementarity between the nonperturbative physics of the hard- and soft-wall correlators emerges, and their ability to describe detailed QCD results can be assessed quantitatively. We further provide the first holographic estimates for the decay constants of the 0++ glueball and its excitations. The hard-wall background turns out to encode more of the relevant QCD physics, and its prediction f_S ~ 0.8-0.9 GeV for the phenomenologically important ground state decay constant agrees inside errors with recent QCD sum rule and lattice results.- 11.25.Tq
- 12.39.Mk
- 12.38.Lg
- quantum chromodynamics
- space-time: anti-de Sitter
- duality: holography
- glueball: scalar
- glueball: decay constant
- glueball: correlation function
- symmetry breaking: conformal
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