On the light glueball spectrum in a holographic description of QCD

Colangelo, P.; Fazio, F. De; Jugeau, F.; Nicotri, S.

doi:10.1016/j.physletb.2007.06.072

Cited by 180 publications

(275 citation statements)

References 41 publications

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“…Moreover, the lowest holographic glueball comes from an "exotic" g 44 polarization of the metric fluctuation (while also involving other metric components as well as the dilaton). The next higher scalar glueball, which has the same mass as the lowest tensor glueball, does not involve a g 44 fluctuation, and could thus be viewed as essentially a dilaton fluctuation, which in simpler bottom-up models [50][51][52] is the only way to model a scalar glueball. The mass of the latter is M D = M T ≈ 1.567M KK ≈ 1487 MeV, which matches reasonably well with the lowest scalar glueball on the lattice (albeit not for the tensor glueball which on the lattice is around 2.4-2.6 GeV).…”

Section: Glueball Spectrum and Glueball Decay Ratesmentioning

confidence: 99%

The Witten-Sakai-Sugimoto model: A brief review and some recent results

Rebhan

2015

EPJ Web of Conferences

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Abstract. A brief review of the Witten-Sakai-Sugimoto model is given, which is a topdown holographic model of low-energy QCD with chiral quarks derived from type-IIA superstring theory. The main predictions of the model, in particular concerning meson spectra, the gluon condensate, the QCD string tension, the mass of the η and of baryons are discussed and compared quantitatively with available experimental and/or lattice results. Then some recent results of potential interest to the physics program at the future FAIR facility are presented: The spectrum of glueballs and their decay rates into pions, and the phase diagram of QCD at finite temperature, density, and magnetic field strength.

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Section: Glueball Spectrum and Glueball Decay Ratesmentioning

confidence: 99%

The Witten-Sakai-Sugimoto model: A brief review and some recent results

Rebhan

2015

EPJ Web of Conferences

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“…The crucial aspect of the foregoing analysis is that the f 0 (600) resonance corresponds to the lightest state in the radially-excited spectrum of the Regge-like scalar-isoscalar states. This is an important point, since scalar glueballs [42,43] and scalar-isoscalar mesons [44,45] have been studied within the AdS/CFT framework, however neglecting the possible role of the lightest scalar in any of these approaches. The soft-wall version has been reviewed in Ref.…”

Section: Gevmentioning

confidence: 99%

Scalar-isoscalar states in the large-NcRegge approach

2010

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Scalar-isoscalar states (J P C = 0 ++ ) are investigated within the large-Nc Regge approach. We elaborate on the consequences of including the lightest f0(600) scalar-isoscalar state into such an analysis, where the position of f0(600) fits very well into the pattern of the radial Regge trajectory. Furthermore, we point out that the pion and nucleon spin-0 gravitational form factors, recently measured on the lattice, provide valuable information on the low-mass spectrum of the scalarisoscalar states on the basis of the scalar-meson dominance in the spin-0 channel. Through the fits to these data we find mσ = 450 − 600 MeV. We compare the predictions of various fits and methods. An analysis of the QCD condensates in the two-point correlators provides further constraints on the parameters of the scalar-isoscalar sector. We find that a simple two-state model suggests a meson nature of f0 (600), and a glueball nature of f0 (980), which naturally explains the ratios of various coupling constants. Finally, we note that the fine-tuned condition of the vanishing dimension-2 condensate in the Regge approach with infinitely many scalar-isoscalar states yields a reasonable value for the mass of the lighest glueball state.

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“…So in order to describe a confining theory, the conformal invariance of AdS 5 must be broken somehow. Two strategies AdS/QCD background have been suggested in the literatures hard-wall model [11][12][13][14][15][16] and soft-wall model [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. In hard-wall model to impose confinement and discrete normalizable modes that is to truncate the regime where string modes can propagate by introducing an IR cutoff in the fifth dimension at a finite value z 0 ∼ 1 Λ QCD .…”

Section: Introductionmentioning

confidence: 99%

The effects of deformation parameter on thermal width of moving quarkonia in plasma

Sadeghi

Tahery

2015

J. High Energ. Phys.

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In general we can say that the thermal width of quarkonia corresponds to imaginary part of it's potential. Gravity dual of theories give explicit form of potential as V QQ . Since there is an explicit formula for ImV QQ one can consider different gravity duals and study the results of contribution of various parameters. Variable gravity duals of moving pair in plasma have different results for potential. Our paper shows that deformation parameter c in warp factor leads to new results that we present them for arbitrary angles of the pair with respect to it's velocity. We compare our results with the case that no deformation parameter is in metric background. We will see that the thermal width of the pair increases with increasing deformation parameter. Also, for nonzero values of deformation parameter the pair feels moving plasma in all distances. In addition our results indicate that contribution of deformation parameter leads to larger dissociation length for the moving pair reverse to the effect of the pair's velocity in the plasma.

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On the light glueball spectrum in a holographic description of QCD

Cited by 180 publications

References 41 publications

The Witten-Sakai-Sugimoto model: A brief review and some recent results

The Witten-Sakai-Sugimoto model: A brief review and some recent results

Scalar-isoscalar states in the large-NcRegge approach

The effects of deformation parameter on thermal width of moving quarkonia in plasma

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