On the Implications of a Dilaton in Gauge Theory

Chabab, M.

doi:10.1142/s0217751x07038955

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…On the other hand, the effective Lagrangian for pure gluon system can also be constructed in terms of lightest glueball [77][78][79] or one scalar particle -dilaton [80][81][82][83][84][85]. The dilaton field is an hypothetical scalar particle predicted by string theory and Kaluza-Klein type theories, and its expectation value probes the strength of the gauge coupling.…”

Section: Pure Gluon System: Quenched Dynamical Soft-wall Holographic mentioning

confidence: 99%

Dynamical holographic QCD model for glueball and light meson spectra

Huang

2013

J. High Energ. Phys.

134

112

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In this work, we offer a dynamical soft-wall model to describe the gluodynamics and chiral dynamics in one systematical framework. We firstly construct a quenched dynamical holographic QCD (hQCD) model in the graviton-dilaton framework for the pure gluon system, then develop a dynamical hQCD model for the two flavor system in the graviton-dilaton-scalar framework by adding light flavors on the gluodynamical background. For two forms of dilaton background field $\Phi=\mu_G^2z^2$ and $\Phi=\mu_G^2z^2\tanh(\mu_{G^2}^4z^2/\mu_G^2)$, the quadratic correction to dilaton background field at infrared encodes important non-perturbative gluodynamics and naturally induces a deformed warp factor of the metric. By self-consistently solving the deformed metric induced by the dilaton background field, we find that the scalar glueball spectra in the quenched dynamical model is in very well agreement with lattice data. For two flavor system in the graviton-dilaton-scalar framework, the deformed metric is self-consistently solved by considering both the chiral condensate and nonperturbative gluodynamics in the vacuum, which are responsible for the chiral symmetry breaking and linear confinement, respectively. It is found that the mixing between the chiral condensate and gluon condensate is important to produce the correct light flavor meson spectra. The pion form factor and the vector couplings are also investigated in the dynamical hQCD model. Besides, we give the criteria for the existence of linear quark potential from the metric structure, and show a negative quadratic dilaton background field is not favored in the graviton-dilaton framework.Comment: 49 pages, 23 figures, version accepted by JHE

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Section: Pure Gluon System: Quenched Dynamical Soft-wall Holographic mentioning

confidence: 99%

Dynamical holographic QCD model for glueball and light meson spectra

Huang

2013

J. High Energ. Phys.

134

112

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“…On the other hand, the interquark potential parameters m and f are treated as being free in our analysis and are obtained by fitting the spin-averaged cc, bb and bc bound states. An excellent fit with the available experimental data can be seen to emerge when the following values are assigned 1 [7],…”

Section: Dick Interquark Potential Readsmentioning

confidence: 86%

An estimate of the mass from quarkonium spectra.

Chabab¹

2011

Proceedings of Identification of Dark Matter 2010 — PoS(IDM2010)

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Using a string inspired theory and assuming that the dilaton is dark matter candidate, we determine the mass of the dilaton from the heavy quarkonium spectra with Dick potential. This potential has a remarkable property of leading to a confining phase parameterized by the non zero mass for the dilaton and a mass scale f. By phenomenological investigation of Dick potential it is shown that the energy levels of charmonium, bottommonium and the B c fit well the experimental data when the dilaton mass is given a value about 57MeV . This estimate lies in the range of values predicted for the dilaton as a cold dark matter, and support the recent experimental evidence for light (1-100 MeV) dark matter as a possible explanation of 511keV gamma-ray emission.

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Broken scale invariance, massless dilaton and confinement in QCD

Kharzeev

Levin

Tuchin

2009

J. High Energy Phys.

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Classical conformal invariance of QCD in the chiral limit is broken explicitly by scale anomaly. As a result, the lightest scalar particle (scalar glueball, or dilaton) in QCD is not light, and cannot be described as a Goldstone boson. Nevertheless basing on an effective low-energy theory of broken scale invariance we argue that inside the hadrons the non-perturbative interactions of gluon fields result in the emergence of a massless dilaton excitation (which we call the "scalaron"). We demonstrate that our effective theory of broken scale invariance leads to confinement. This theory allows a dual formulation as a classical Yang-Mills theory on a curved conformal spacetime background. Possible applications are discussed, including the description of strongly coupled quark-gluon plasma and the spin structure of hadrons.

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On the Implications of a Dilaton in Gauge Theory

Cited by 3 publications

References 18 publications

Dynamical holographic QCD model for glueball and light meson spectra

Dynamical holographic QCD model for glueball and light meson spectra

An estimate of the mass from quarkonium spectra.

Broken scale invariance, massless dilaton and confinement in QCD

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