Melting spectral functions of the scalar and vector mesons in a holographic QCD model

Fujita, Mitsutoshi; Kikuchi, Toru; Fukushima, Kenji; Misumi, Tatsuhiro; Murata, Masaki

doi:10.1103/physrevd.81.065024

Cited by 58 publications

(71 citation statements)

References 93 publications

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“…Following [19,20], we use this action to describe the heavy charm vector current (the J=ψ mesons), where c ¼ 2.43 GeV 2 , obtained by matching the J=ψ spectrum with experiment. Hence we reduce to a Uð1Þ flavor group with F ¼ dV for a gauge field V. The relative size of c compared to c ρ , viz.…”

Section: The Holographic Charmonium Model In a Magnetic Fieldmentioning

confidence: 99%

Holographic estimate of heavy quark diffusion in a magnetic field

Dudal

Mertens

2018

Phys. Rev. D

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We study the influence of a background magnetic field on the J=ψ vector meson in a Dirac-Born-Infeldextension of the soft wall model, building upon our earlier work [D. Dudal and T. G. Mertens Phys. Rev. D 91, 086002 (2015)]. In this specific holographic QCD model, we discuss the heavy quark number susceptibility and diffusion constants of charm quarks and their dependence on the magnetic field by either a hydrodynamic expansion or by numerically solving the differential equation. This allows us to determine the response of these transport coefficients to the magnetic field. The effects of the latter are considered both from a direct as indirect (medium) viewpoint. As expected, we find a magnetic field induced anisotropic diffusion, with a stronger diffusion in the longitudinal direction compared to the transversal one. We backup, at least qualitatively, our findings with a hanging string analysis of heavy quark diffusion in a magnetic field. From the quark number susceptibility we can extract an estimate for the effective deconfinement temperature in the heavy quark sector, reporting consistency with the phenomenon of inverse magnetic catalysis.

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Section: The Holographic Charmonium Model In a Magnetic Fieldmentioning

confidence: 99%

Holographic estimate of heavy quark diffusion in a magnetic field

Dudal

Mertens

2018

Phys. Rev. D

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“…We show in figure 16 some examples of this computation. We have plotted 12π In [57], a bottom-up holographic model was built in order to discuss the physics of the J/Ψ above the phase transition (see also [58] for related work). In the model of [57], there is also no discrete spectrum but, for low enough temperature, by engineering the potential, the J/Ψ shows up as a peak in the spectral function (or, alternatively, as a small negative imaginary part of the associated quasinormal frequency).…”

Section: Jhep11(2010)123mentioning

confidence: 99%

Thermodynamics of SU(N) Yang-Mills theories in 2 + 1 dimensions II — The deconfined phase

Caselle

Castagnini

Feo

et al. 2012

J. High Energ. Phys.

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A simple holographic model is presented and analyzed that describes chiral symmetry breaking and the physics of the meson sector in QCD. This is a bottom-up model that incorporates string theory ingredients like tachyon condensation which is expected to be the main manifestation of chiral symmetry breaking in the holographic context. As a model for glue the Kuperstein-Sonnenschein background is used. The structure of the flavor vacuum is analyzed in the quenched approximation. Chiral symmetry breaking is shown at zero temperature. Above the deconfinement transition chiral symmetry is restored. A complete holographic renormalization is performed and the chiral condensate is calculated for different quark masses both at zero and non-zero temperatures. The 0 ++ , 0 −+ , 1 ++ , 1 −− meson trajectories are analyzed and their masses and decay constants are computed. The asymptotic trajectories are linear. The model has one phenomenological parameter beyond those of QCD that affects the 1 ++ , 0 −+ sectors. Fitting this parameter we obtain very good agreement with data. The model improves in several ways the popular hard-wall and soft wall bottom-up models.

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“…For the relation to truncated string (M) theory and supergravity, see remarks in [64]. The action (1) with G m = 1, originally put forward in the soft-wall (SW) model for light-quark mesons [65], is also used for describing heavy-quark vector mesons [45,46,48,47], e.g. charmonium [49,50] or bottomonium [51].…”

Section: Probe Vector Mesonsmentioning

confidence: 99%

“…That is, the dilaton potential is adjusted to QCD 2+1 (phys) lattice data. Such an approach looks quite different in relation to holographic investigations of meson melting without reference to QCD thermodynamics [35,45,46,47,48,49,50,51,52,53,54,55]. We restrict ourselves to equilibrium and leave non-equilibrium effects [56,57] for future work.…”

Section: Introductionmentioning

confidence: 99%

Holographic vector mesons in a dilaton background

Zöllner

Kämpfer

2018

J. Phys.: Conf. Ser.

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A holographic model of probe vector mesons (quarkonia) is presented, where the dynamical gravity-dilaton background is adjusted to the thermodynamics of 2 +1 flavor QCD with physical quark masses. The vector meson action is modified to account for various quark masses. We focus on the Φ, J/ψ and Υ meson melting in agreement with hadron phenomenology in heavy-ion collisions at LHC, that is the formation of hadrons at the observed freeze-out temperature of 155 MeV.

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Melting spectral functions of the scalar and vector mesons in a holographic QCD model

Cited by 58 publications

References 93 publications

Holographic estimate of heavy quark diffusion in a magnetic field

Holographic estimate of heavy quark diffusion in a magnetic field

Thermodynamics of SU(N) Yang-Mills theories in 2 + 1 dimensions II — The deconfined phase

Holographic vector mesons in a dilaton background

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