Static quark-antiquark pairs at finite temperature

Brambilla, Nora; Ghiglieri, Jacopo; Vairo, Antonio; Petreczky, Péter

doi:10.1103/physrevd.78.014017

Cited by 485 publications

(762 citation statements)

References 49 publications

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“…If E ≫ m D the dominant mechanism is gluo-dissociation while if m D ≫ E it is inelastic parton scattering. This conclusion can be easily obtained using pNRQCD power counting [4,7]. In the next two sections we are going to discuss these two processes in detail.…”

Section: Non-relativistic Efts For Heavy Quarkoniummentioning

confidence: 79%

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The relation between cross section, decay width and imaginary potential of heavy quarkonium in a quark–gluon plasma

Escobedo

2013

Nuclear Physics A

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Abstract. Heavy quarkonium suppression was proposed long ago as a signal of the formation of a deconfined phase in heavy ion collisions. Originally the mechanism responsible for this suppression was thought to be color screening. However perturbative computations and recent lattice studies suggest the existence of an imaginary part of the potential which could have a more important role for suppression than screening. In this work we review some general aspects of effective field theories for heavy quarkonium in the medium and discuss the physical phenomena behind the imaginary part of the potential and the decay width of heavy quarkonium and their corresponding cross sections. IntroductionHeavy quarkonium is a meson formed by two heavy quarks whose mass m Q is much bigger than Λ QCD . They are quite different to other mesons. The first difference is that a lot of the physics relevant to study this system happens at a energy scale m Q where perturbation theory is applicable. For example the typical size of the more deeply bounded quarkonium states is of order 1/(m Q v), where v is the velocity of the heavy quarks around the center of mass, while for other mesons the size is of order 1/Λ QCD . A second difference is that heavy quarkonium is a non-relativistic system, meaning that v ≪ 1. For this reason it is expectable that at some accuracy it can be described by a Schrödinger equation with some potential, hence we can say that it is the QCD analogous to the hydrogen atom. On the other hand this small v can spoil naive perturbation theory in a way that will be discussed later.The original idea of using quarkonium suppression as a probe of deconfinement in heavy ion collisions is found in [1]. Since then this phenomena has been studied experimentally in many facilities, as for example SPS, RHIC and LHC. In the future the CBM experiment will be able to probe the situation when the quark-gluon plasma has a large chemical potential. Even though quarkonium suppression is a well established experimental fact an understanding of the responsible mechanism and a quantitative description of experimental data is still missing.The dissociation mechanism that was originally considered in [1] was color screening. In order to illustrate this mechanism we can make use of what happens in the perturbative limit of QCD. There the potential between two infinitely heavy color charges in the vacuum will have the form of a Coulomb potential V (r) = − α r . Then the two heavy charges will feel an attractive

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Section: Non-relativistic Efts For Heavy Quarkoniummentioning

confidence: 79%

“…A way to answer this question that has been very successful in the vacuum is by using effective field theories (EFTs). This program for finite temperature T and zero chemical potential µ has been started in the last years [3,4]. Using these techniques the potential of [2] has been confirmed for T ≫ m D ∼ 1/r.…”

Section: Introductionmentioning

confidence: 95%

The relation between cross section, decay width and imaginary potential of heavy quarkonium in a quark–gluon plasma

Escobedo

2013

Nuclear Physics A

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“…At sufficiently high temperatures the decrease in F Q is associated with onset of color screening which also leads to the same decrease in the energy of a static quark at leading order [42]. For temperatures T < 140 MeV the decrease in F Q could be explained in terms of hadron resonance gas model.…”

Section: Discussionmentioning

confidence: 93%

Polyakov loop in2+1flavor QCD

2013

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We study the temperature dependence of the renormalized Polyakov loop in 2+1 flavor QCD for temperatures T < 210 MeV. We extend previous calculations by the HotQCD collaboration using the highly improved staggered quark action and perform a continuum extrapolation of the renormalized Polyakov loop. We compare the lattice results with the prediction of non-interacting static-light hadron resonance gas, which describes the temperature dependence of the renormalized Polyakov loop up to T < 140 MeV but fails above that temperature. Furthermore, we discuss the temperature dependence of the light and strange quark condensates.

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“…The dissociation rates have been calculated in several approaches. In [34,35] the imaginary part of the potentials -which is related to dissociation -has been calculated in the hard thermal loop framework. In [36] the thermal width has been calculated using the calculation of collisional decay rates [37].…”

Section: Introductionmentioning

confidence: 99%

High transverse momentum quarkonium production and dissociation in heavy ion collisions

2013

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We calculate the yields of quarkonia in heavy ion collisions at RHIC and the LHC as a function of their transverse momentum. Based upon non-relativistic quantum chromodynamics, our results include both color-singlet and color-octet contributions and feed-down effects from excited states. In reactions with ultra-relativistic nuclei, we focus on the consistent implementation of dynamically calculated nuclear matter effects, such as coherent power corrections, cold nuclear matter energy loss, and the Cronin effect in the initial state. In the final state, we consider radiative energy loss for the color-octet state and collisional dissociation of quarkonia as they traverse through the QGP. Theoretical results are presented for J/ψ and Υ and compared to experimental data where applicable. At RHIC, a good description of the high-pT J/ψ modification observed in central Cu+Cu and Au+Au collisions can be achieved within the model uncertainties. We find that measurements of J/ψ yields in proton-nucleus reactions are needed to constrain the magnitude of cold nuclear matter effects. At the LHC, a good description of the experimental data can be achieved only in mid-central and peripheral Pb+Pb collisions. The large five-fold suppression of prompt J/ψ in the most central nuclear reactions may indicate for the first time possible thermal effects at the level of the quarkonium wavefunction at large transverse momenta.

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Static quark-antiquark pairs at finite temperature

Cited by 485 publications

References 49 publications

The relation between cross section, decay width and imaginary potential of heavy quarkonium in a quark–gluon plasma

The relation between cross section, decay width and imaginary potential of heavy quarkonium in a quark–gluon plasma

Polyakov loop in2+1flavor QCD

High transverse momentum quarkonium production and dissociation in heavy ion collisions

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