Quarkonia in anisotropic hot QCD medium in a quasi-particle model

Chandra, Vinod; Ravishankar, V.

doi:10.1016/j.nuclphysa.2010.09.015

Cited by 29 publications

(24 citation statements)

References 75 publications

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“…We have assumed that the medium is a weakly coupled plasma, moving homogeneously and at a constant temperature, therefore our study needs a number of refinements to be realistically applied to HQ states in heavy-ion collisions. In that case, one should consider the expansion and cooling of the thermal medium, as well as possible anisotropies [41][42][43][44]. In any case, we expect that the qualitative features we observe, namely, that the decay width decreases with increasing velocity, and hence that Landau damping ceases to be the relevant mechanism for dissociation at a certain critical velocity, will remain true.…”

Section: Discussionmentioning

confidence: 98%

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Nonrelativistic bound states in a moving thermal bath

2011

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We study the propagation of nonrelativistic bound states moving at constant velocity across a homogeneous thermal bath and we develop the effective field theory which is relevant in various dynamical regimes. We consider values of the velocity of the bound state ranging from moderate to highly relativistic and temperatures at all relevant scales smaller than the mass of the particles that form the bound state. In particular, we consider two distinct temperature regimes, corresponding to temperatures smaller or higher than the typical momentum transfer in the bound state. For temperatures smaller or of the order of the typical momentum transfer, we restrict our analysis to the simplest system, a hydrogenlike atom. We build the effective theory for this system first considering moderate values of the velocity and then the relativistic case. For large values of the velocity of the bound state, the separation of scales is such that the corresponding effective theory resembles the soft collinear effective theory (SCET). For temperatures larger than the typical momentum transfer we also consider muonic hydrogen propagating in a plasma which contains photons and massless electrons and positrons, so that the system resembles very much a heavy quarkonium in a thermal medium of deconfined quarks and gluons. We study the behavior of the real and imaginary part of the static two-body potential, for various velocities of the bound state, in the hard thermal loop approximation. We find that Landau damping ceases to be the relevant mechanism for dissociation from a certain critical velocity on, in favor of screening. Our results are relevant for understanding how the properties of heavy quarkonia states produced in the initial fusion of partons in the relativistic collision of heavy ions are affected by the presence of an equilibrated quark-gluon plasma.

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Section: Discussionmentioning

confidence: 98%

“…(28). Upon making a local field redefinition to remove the term with a time derivative in (44), one can identify the corrections to the potential, in a similar way as it was done in Eq. (45) of [14].…”

Section: B the T $ 1=r Casementioning

confidence: 99%

Nonrelativistic bound states in a moving thermal bath

2011

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“…In a very recent work, Mitra and Chandra [30] estimated the electrical conductivity and charge diffusion coefficients employing EQPM. The EQPM has also served as basis to incorporate hot QCD medium effects while investigating heavyquark transport in isotropic [34] and anisotropic [33] along with quarkonia in hot QCD medium [31,32] and thermal particle production [35,36]. However, the above model calculations were not able to exactly yield the shear and bulk viscosities phenomenologically extracted from the hydrodynamic simulations of the QGP [3,4], consistently agreeing with different experimental observables measured such as the multiplicity, transverse momentum spectra and the integrated flow harmonics of charged hadrons.…”

Section: A Isotropic Hot Qcd Mediummentioning

confidence: 99%

Collective excitations of hot QCD medium in a quasiparticle description

2017

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Collective excitations of a hot QCD medium are the main focus of the present article. The analysis is performed within semi-classical transport theory with isotropic and anisotropic momentum distribution functions for the gluonic and quark-antiquark degrees of freedom that constitutes the hot QCD plasma. The isotropic/equilibrium momentum distributions for gluons and quarks are based on a recent quasi-particle description of hot QCD equations of state. The anisotropic distributions are just the extensions of isotropic ones by stretching or squeezing them in one of the directions. The hot QCD medium effects in the model adopted here enter through the effective gluon and quark fugacities along with non-trivial dispersion relations leading to an effective QCD coupling constant. Interestingly, with these distribution functions the tensorial structure of the gluon polarization tensor in the medium turned out to be similar to the one for the non-interacting ultra-relativistic system of quarks/antiquarks and gluons . The interactions mainly modify the Debye mass parameter and , in turn, the effective coupling in the medium. These modifications have been seen to modify the collective modes of the hot QCD plasma in a significant way.

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“…The effective mass methods [9][10][11][12][13][14], the approaches based on the Polyakov loop [15][16][17][18][19], the approach based on Fermi liquids theory [20][21][22][23][24] and so on. Compared with the first and second approach, the third one is fundamentally different and powerful.…”

Section: Moments Of Net-baryon Distributions and Quasi-particle Modelmentioning

confidence: 99%

“…Compared with the first and second approach, the third one is fundamentally different and powerful. Besides reproducing the EoS accurately, it is also successful in predicting the bulk and transport properties of QGP [20][21][22][23][24].Gorenstein and Yang pointed out that the initial quasiparticle model was thermodynamically inconsistent and then 123 …”

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confidence: 99%

Baryon number fluctuations in quasi-particle model

2017

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Baryon number fluctuations are sensitive to the QCD phase transition and the QCD critical point. According to the Feynman rules of finite-temperature field theory, we calculated various order moments and cumulants of the baryon number distributions in the quasi-particle model of the quark-gluon plasma. Furthermore, we compared our results with the experimental data measured by the STAR experiment at RHIC. It is found that the experimental data can be well described by the model for the colliding energies above 30 GeV and show large discrepancies at low energies. This puts a new constraint on the qQGP model and also provides a baseline for the QCD critical point search in heavy-ion collisions at low energies. Moments of net-baryon distributions and quasi-particle model of QGPLattice QCD calculations indicate that at baryon chemical potential μ B = 0, the transition from the quark-gluon plasma (QGP) to a hadron gas is a smooth crossover, while at large μ B , the phase transition is of first order. The end point of the first order phase transition boundary is the so- On the other hand, the moments of the baryon number are related to the various order baryon number susceptibilities [4]. In order to cancel the volume, the products of the moments, Sσ and κσ 2 , are constructed as the experimental observables. The results in RHIC of these observables show a centrality and energy dependence [5], which are not reproduced by a non-CP transport and hadron resonance gas model calculations. The deviations of Sσ and κσ 2 below the Skellam expectation are qualitatively consistent with a QCDbased model which includes a CP [6]. The energy dependence of the κσ 2 of net-proton distributions in Au+Au collisions show non-monotonic behavior, which is consistent with being close to the CP [7,8].In this paper we apply the quasi-particle model (qQGP) of the quark-gluon plasma (QGP) to calculate the moments of the net-baryon distributions. The qQGP model was first proposed by Peshier et al. [9] to study the non-ideal equation of state (EoS) by lattice QCD results. Instead of real quarks and gluons with QCD interactions, the system is considered to be made up of non-interacting quasi-quarks and quasigluons with thermal masses. Quasi-particles are thought to be quanta of plasma collective modes excited by quarks and gluons through QCD interactions.By now, some approaches have been proposed to study the qQGP model. The effective mass methods [9][10][11][12][13][14], the approaches based on the Polyakov loop [15][16][17][18][19], the approach based on Fermi liquids theory [20][21][22][23][24] and so on. Compared with the first and second approach, the third one is fundamentally different and powerful. Besides reproducing the EoS accurately, it is also successful in predicting the bulk and transport properties of QGP [20][21][22][23][24].Gorenstein and Yang pointed out that the initial quasiparticle model was thermodynamically inconsistent and then 123

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Quarkonia in anisotropic hot QCD medium in a quasi-particle model

Cited by 29 publications

References 75 publications

Nonrelativistic bound states in a moving thermal bath

Nonrelativistic bound states in a moving thermal bath

Collective excitations of hot QCD medium in a quasiparticle description

Baryon number fluctuations in quasi-particle model

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