Quarkonium Binding and Dissociation: The Spectral Analysis of the QGP

Satz, Helmut

doi:10.1016/j.nuclphysa.2006.11.026

Cited by 91 publications

(94 citation statements)

References 31 publications

(40 reference statements)

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“…[19] has been combined with the formulation of the response function of QGP [29], and the dissociation temperatures for J/Ψ and Υ have been estimated. These numbers are again reasonably close to the predictions of other theoretical works [30,31]. This motivates us to further utilize EOS1 and EOS2 to study the behavior of thermodynamic quantities such as energy density, entropy density, and most importantly, the transport parameters, shear viscosity η and viscosity to entropy density ratio η/S, for the rapidly expanding plasma.…”

Section: Hot Qcd Equations Of State and Their Quasiparticle Descrsupporting

confidence: 86%

Viscosity and thermodynamic properties of QGP in relativistic heavy-ion collisions

Chandra

Ravishankar

2008

Eur. Phys. J. C

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We study the viscosity and thermodynamic properties of QGP at RHIC by employing the recently extracted equilibrium distribution functions from two hot QCD equations of state of O(g 5 ) and O(g 6 ln(1/g)) respectively. After obtaining the temperature dependence of energy density, and entropy density, we focus our attention on the determination of shear viscosity for a rapidly expanding interacting plasma, as a function of temperature. We find that interactions significantly decrease the shear viscosity. They decrease the viscosity to entropy density ratio, η/S as well.

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Section: Hot Qcd Equations Of State and Their Quasiparticle Descrsupporting

confidence: 86%

Viscosity and thermodynamic properties of QGP in relativistic heavy-ion collisions

Chandra

Ravishankar

2008

Eur. Phys. J. C

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“…(As reviewed in section 4.1, for 0 ≤ v < 0.991 the exponent implied by the AdS/CFT calculation is really closer to 1/3 than to 1/4.) The argument for this velocity scaling is heuristic, and relies on comparing the screening length against the natural size of the bound state in question (see, e.g., [71] and references therein). Applying the same logic to the fits (5.19) or (5.21) for the screening length in the case of masses in the neighborhood of the charm quark (z m /z h ∼ 0.2-0.4, as in figures [15][16], one would infer that T diss ∝ (v 2 m − v 2 ) n , with n ≃ 1/3 for general v, and n = 1 in the v → v m limit (the latter being the preferred fit only in the restricted range v > 0.998 or v > 0.98, depending on the value of z m ).…”

Section: Finite Mass At Finite Temperaturementioning

confidence: 99%

Acceleration, energy loss and screening in strongly-coupled gauge theories

Chernicoff¹,

Güijosa²

2008

J. High Energy Phys.

198

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Abstract:We explore various aspects of the motion of heavy quarks in strongly-coupled gauge theories, employing the AdS/CFT correspondence. Building on earlier work by Mikhailov, we study the dispersion relation and energy loss of an accelerating finite-mass quark in N = 4 super-Yang-Mills, both in vacuum and in the presence of a thermal plasma. In the former case, we notice that the application of an external force modifies the dispersion relation. In the latter case, we find in particular that when a static heavy quark is accelerated by an external force, its rate of energy loss is initially insensitive to the plasma, and there is a delay before this rate approaches the value derived previously from the analysis of stationary or late-time configurations. Following up on work by Herzog et al., we also consider the evolution of a quark and antiquark as they separate from one another after formation, learning how the AdS/CFT setup distinguishes between the singlet and adjoint configurations, and locating the transition to the stage where the deceleration of each particle is properly accounted for by a constant friction coefficient. Additionally, we examine the way in which the energy of a quark-antiquark pair moving jointly through the plasma scales with the quark mass. We find that the velocity-dependence of the screening length is drastically modified in the ultra-relativistic region, and is comparable with that of the transition distance mentioned above.

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“…Therefore, following the temperature behavior of the spectral function, theoretical insight to the quarkonium properties at finite temperature can be made. There are mainly two lines of theoretical approaches to determine quarkonium spectral functions, viz., the potential models [13][14][15][16] which have been widely used to study quarkonia states (their applicability at finite temperature is still under scrutiny), and the lattice QCD studies [17,18] which provides the reliable way to determine spectral functions, but the results suffer from discretization effects and statistical errors, and thus are still inconclusive. These two approaches show poor matching as far as their predictions are concerned.…”

Section: Introductionmentioning

confidence: 99%

Dissociation of heavy quarkonium in hot QCD medium in a quasiparticle model

et al. 2016

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Following a recent work on the effective description of the equations of state for hot QCD obtained from a Hard thermal loop expression for the gluon self-energy, in terms of the quasi-gluons and quasiquark/anti-quarks with respective effective fugacities, the dissociation process of heavy quarkonium in hot QCD medium has been investigated. This has been done by investigating the medium modification to a heavy quark potential. The medium modified potential has a quite different form (a long range Coulomb tail in addition to the usual Yukawa term) in contrast to the usual picture of Debye screening. The flavor dependence of the binding energies of the heavy quarkonia states and the dissociation temperature have been obtained by employing the debye mass for pure gluonic and full QCD case computed employing the quasi-particle picture. Thus estimated dissociation patterns of the charmonium and bottomonium states, considering Debye mass from different approaches in pure gluonic case and full QCD, have shown good agreement with the other potential model studies. 24.85.+p; 12.38.Mh PACS

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Quarkonium Binding and Dissociation: The Spectral Analysis of the QGP

Cited by 91 publications

References 31 publications

Viscosity and thermodynamic properties of QGP in relativistic heavy-ion collisions

Viscosity and thermodynamic properties of QGP in relativistic heavy-ion collisions

Acceleration, energy loss and screening in strongly-coupled gauge theories

Dissociation of heavy quarkonium in hot QCD medium in a quasiparticle model

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