Charmonium systems after the deconfinement transition

Datta, Saumen; Karsch, Frithjof; Petreczky, Péter; Wetzorke, I.

doi:10.1088/0954-3899/30/8/124

Cited by 28 publications

(34 citation statements)

References 11 publications

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“…This initial intuitive expectation has guided experimental studies for almost two decades. However, more recent lattice QCD (lQCD) calculations have shown that the J/Ψ survives up to at least 1.5 T c (T c ≈ 170 to 185 MeV) such that the lowest cc state remains bound up to rather high energy density [4,5,6]. On the other hand the χ c and Ψ ′ appear to melt soon above T c .…”

mentioning

confidence: 99%

Charmonium dynamics in Au+Au collisions ats=200GeV

Linnyk¹,

Bratkovskaya²,

Cassing³

et al. 2007

Phys. Rev. C

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The formation and suppression dynamics of J/Ψ, χc and Ψ ′ mesons is studied within the HSD transport approach for Au+Au reactions at the top RHIC energy of √ s = 200 GeV. Two prominent models, which have been discussed for more than a decade, are incorporated, i.e. the 'hadronic comover absorption and reformation' model as well as the 'QGP threshold' scenario, and compared to available experimental data. Our studies demonstrate that both scenarios -compatible with experimental observation at SPS energies -fail severely at RHIC energies. This combined analysis -together with the underestimation of charm elliptic flow -proves that the dynamics of c,c quarks are dominated by partonic interactions in the strong QGP (sQGP) and can neither be modeled by 'hadronic' interactions nor described appropriately by color screening alone.PACS numbers: 25.75.-q, 13.60. Le, 12.38.Mh, 14.40.Lbp, 14.65.Dw According to current understanding, the evolution of the universe in the 'Big Bang' scenario has proceeded from a quark-gluon plasma (QGP) to color neutral hadronic states within the first second of its lifetime. In this context, the dynamics of ultra-relativistic nucleus-nucleus collisions at Super-Proton-Synchrotron (SPS) and Relativistic-Heavy-Ion-Collider (RHIC) energies are of fundamental importance as reflecting the properties of hadronic/partonic systems at high energy densities. The c,c quark degrees of freedom are of particular interest with respect to a phase transition from baryonic matter to the QGP, since cc meson states might no longer be formed in the very hot fireball due to color screening [1,2,3]. This initial intuitive expectation has guided experimental studies for almost two decades. However, more recent lattice QCD (lQCD) calculations have shown that the J/Ψ survives up to at least 1.5 T c (T c ≈ 170 to 185 MeV) such that the lowest cc state remains bound up to rather high energy density [4,5,6]. On the other hand the χ c and Ψ ′ appear to melt soon above T c . It is presently not clear, if also the D and D * mesons will survive at temperatures T > T c , but strong correlations between a light quark (antiquark) and a charm antiquark (quark) are likely to persist [7]. One may speculate that similar correlations survive also in the light quark sector above T c , such that 'hadronic comovers' -most likely with different spectral functions -might show up also at energy densities above 1 GeV/fm 3 , which is taken as a characteristic scale for the critical energy density. * Electronic address: linnyk@fias.uni-frankfurt.de † Also at Frankfurt Institute for Advanced Studies, 60438 Frankfurt am Main, GermanyThe production of charmonium in heavy-ion collisions, i.e. of cc pairs, occurs dominantly at the initial stage of the reaction in primary nucleon-nucleon collisions. At the very early stage the cc pairs are expected to form color dipole states which experience i) absorption by interactions with further nucleons of the colliding nuclei (cf. Refs. [8,9]). These cc color dipoles can be absorbed in a 'pre-resonance...

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confidence: 99%

Charmonium dynamics in Au+Au collisions ats=200GeV

Linnyk¹,

Bratkovskaya²,

Cassing³

et al. 2007

Phys. Rev. C

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“…3. Charmonium spectral function above T c in V channel, whose lowest state corresponds to J/ψ (left), and in AV channel, whose lowest state corresponds to χ c (right) [6].…”

Section: Numerical Results Of the Charmonium Spectral Functionsmentioning

confidence: 99%

“…Next the Bielefeld group tried to calculate on isotropic quenched lattices with local operators [6]. Figure (left) shows the spectral function in V channel at various temperature above T c .…”

Section: Numerical Results Of the Charmonium Spectral Functionsmentioning

confidence: 99%

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Quarkonium at Finite Temperature

Umeda

2007

Nuclear Physics A

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“…These heavy quarks will be embedded in a matter mainly formed by gluons and light quarks (u,d,s) and could behave like Brownian particles [ 11], therefore their transverse momentum (p T ) and rapidity distributions will probe the properties of the surrounding matter. In addition, the study of the heavy quark bound states will allow to probe the medium via the Debye screening [ 12], the gluon dissociation of quarkonia [ 13], statistical recombination of heavy quarks [ 14] and/or statistical hadronization [ 15]. Additionally, high p T heavy quarks will also probe the surrounding hadronic medium via heavy-quark matter interaction [ 18].…”

Section: Heavy Quark Productionmentioning

confidence: 99%