Quarkonia in the deconfined phase: Effective potentials and lattice correlators

Alberico, W.M.; Beraudo, A.; Pace, A. De; Molinari, A.

doi:10.1103/physrevd.75.074009

Cited by 103 publications

(165 citation statements)

References 62 publications

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“…Such width slightly above T c is larger than that estimated from a perturbative LO and NLO QCD matrix element calculation together with an assumption of weakly interacting quarks and gluons with thermal masses [18,19], but smaller than a recent phenomenological estimate [20]. The mass of quarkonium at finite temperature was also investigated in the potential models [21], where the mass was found to decrease at high temperature. However, the potential has to be extracted from the lattice at each temperature and hence a more detailed investigation are needed to identify the critical behaviour of J/ψ in the temperature region near T c .…”

Section: Qcd Sum Rule Resultsmentioning

confidence: 92%

Properties of quarkonia atT_c

Lee¹,

Morita²

2008

J. Phys. G: Nucl. Part. Phys.

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Abstract. We discuss how the spectral changes of quarkonia at T c can reflect the "critical" behaviour of QCD phase transition. Starting from the temperature dependencies of the energy density and pressure from lattice QCD calculation, we extract the temperature dependencies of the scalar and spin 2 gluon condensates near T c . We also parameterize these changes into the electric and magnetic condensate near T c . While the magnetic condensate hardly changes across T c , we find that the electric condensate increases abruptly above T c . Similar abrupt change is also seen in the scalar condensate. Using the QCD second-order Stark effect and QCD sum rules, we show that these sudden changes induce equally abrupt changes in the mass and width of J/ψ, both of which are larger than 100 MeV at slightly above T c .

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Section: Qcd Sum Rule Resultsmentioning

confidence: 92%

Properties of quarkonia atT_c

Lee¹,

Morita²

2008

J. Phys. G: Nucl. Part. Phys.

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“…The results of these calculations have been compared to lattice results and no agreement has been found. Very recently this approach has been extended using the full nonrelativistic Green's function of heavy quark antiquark pairs to estimate the spectral function and the corresponding Euclidean correlators [21,22,33]. However, even in these approaches no agreement with lattice calculations has been found.…”

Section: Introductionmentioning

confidence: 99%

“…While in these works phenomenological potentials have been used, more recent studies went one step further and attempted to connect the potential to lattice calculations of the finite temperature free energy of a static quark antiquark pair [15,16,17,18,19,20,21,22].…”

Section: Introductionmentioning

confidence: 99%

Can quarkonia survive deconfinement?

2008

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We study quarkonium correlators and spectral functions at zero and finite temperature in QCD with only heavy quarks using potential models combined with perturbative QCD. First, we show that this approach can describe the quarkonium correlation function at zero temperature. Using a class of screened potentials based on lattice calculations of the static quark-antiquark free energy we calculate spectral functions at finite temperature. We find that all quarkonium states, with the exception of the 1S bottomonium, dissolve in the deconfined phase at temperatures smaller than 1.5Tc, in contradiction with the conclusions of recent studies. Despite this the temperature dependence of the quarkonium correlation functions calculated on the lattice is well reproduced in our model. We also find that even in the absence of resonances the spectral function at high temperatures is significantly enhanced over the spectral function corresponding to free quark antiquark propagation.

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“…In practice, determination of the screening radius r D (T ) turned out to be a remarkably difficult problem even in a static medium. The existing approaches to solve this problem include lattice QCD calculations of quarkonium correlators [2][3][4][5][6][7], construction of potential models of quarkonium spectral functions [8][9][10][11][12][13][14], and use of effective field theory [15][16][17]. It is remarkable that in spite of much progress there still exists substantial uncertainty in the value of the J/ψ dissociation temperature and in the functional form of r D (T ); see, e.g., [18,19].…”

Section: Introductionmentioning

confidence: 99%

Quarkonium dissociation in quark-gluon plasma via ionization in a magnetic field

Marasinghe

Tuchin

2011

Phys. Rev. C

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We study the impact of a magnetic field, generated in collisions of relativistic heavy ions, on the decay probability of a quarkonium produced in the central rapidity region. The quark and antiquark components are subject to mutually orthogonal electric and magnetic fields in the quarkonium comoving frame. In the presence of an electric field, the quarkonium has a finite dissociation probability.We use theWKB approximation to derive the dissociation probability. We find that the quarkonium dissociation energy, i.e., the binding energy at which the dissociation probability is of order unity, increases with the magnetic field strength. It also increases with quarkonium momentum in the laboratory frame owing to the Lorentz boost of the electric field in the comoving frame. We argue that J/ψ's produced in heavy-ion collisions at the Large Hadron Collider with P⊥ > 9 GeV would dissociate even in vacuum. In plasma, the J/ψ dissociation in a magnetic field is much stronger because of the decrease of its binding energy with temperature.We discuss phenomenological implications of our results. Disciplines Astrophysics and Astronomy | Physics CommentsThis article is from Physical Review C 84 (2011) We study the impact of a magnetic field, generated in collisions of relativistic heavy ions, on the decay probability of a quarkonium produced in the central rapidity region. The quark and antiquark components are subject to mutually orthogonal electric and magnetic fields in the quarkonium comoving frame. In the presence of an electric field, the quarkonium has a finite dissociation probability. We use the WKB approximation to derive the dissociation probability. We find that the quarkonium dissociation energy, i.e., the binding energy at which the dissociation probability is of order unity, increases with the magnetic field strength. It also increases with quarkonium momentum in the laboratory frame owing to the Lorentz boost of the electric field in the comoving frame. We argue that J/ψ's produced in heavy-ion collisions at the Large Hadron Collider with P ⊥ > 9 GeV would dissociate even in vacuum. In plasma, the J/ψ dissociation in a magnetic field is much stronger because of the decrease of its binding energy with temperature. We discuss phenomenological implications of our results.

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Quarkonia in the deconfined phase: Effective potentials and lattice correlators

Cited by 103 publications

References 62 publications

Properties of quarkonia atT_c

Properties of quarkonia atT_c

Can quarkonia survive deconfinement?

Quarkonium dissociation in quark-gluon plasma via ionization in a magnetic field

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Quarkonia in the deconfined phase: Effective potentials and lattice correlators

Cited by 103 publications

References 62 publications

Properties of quarkonia atTc

Properties of quarkonia atTc

Can quarkonia survive deconfinement?

Quarkonium dissociation in quark-gluon plasma via ionization in a magnetic field

Contact Info

Product

Resources

About

Properties of quarkonia atT_c

Properties of quarkonia atT_c