Quark coalescence and charm(onium) in QGP

Rapp, Ralf

doi:10.1140/epjc/s2005-02215-0

Cited by 24 publications

(22 citation statements)

References 35 publications

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“…Several theoretical predictions for the In-In suppression pattern were formulated before the NA60 experimental results became available. They include a model where the anomalous suppression is due to interaction with hadronic comovers [18], another where the effect of dissociation and regeneration in a fully thermalized QGP and in the later hadronic stage is considered [19], and…”

Section: Pos(cpod07)033mentioning

confidence: 99%

Dilepton measurements with NA60

Scomparin¹

2008

Proceedings of Critical Point and Onset of Deconfinement - 4th International Workshop — PoS(CPOD07)

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The NA60 experiment at the CERN SPS has measured muon pair production in In-In and p-A collisions. A significant excess with respect to expected sources has been observed, for In-In interactions, in the mass region below the J/ψ, likely connected with thermal dimuon production. A study of the transverse momentum distribution of the excess suggests that a significant fraction of the thermal emission is of partonic origin. Furthermore, a suppression of the J/ψ yield beyond pure nuclear absorption has been observed, with an onset of the effect at N part 80. The J/ψ production has also been studied for the first time in p-A collisions at 158 GeV, the same energy of the In-In data sample, providing an important reference for the charmonium suppression studies. In this paper, the available results are presented, and future perspectives are shortly discussed.

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Section: Pos(cpod07)033mentioning

confidence: 99%

Dilepton measurements with NA60

Scomparin¹

2008

Proceedings of Critical Point and Onset of Deconfinement - 4th International Workshop — PoS(CPOD07)

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“…This approach is still in a qualitative level and the space-time evolution of the system has not been taken into account. The second scenario is based on the substantial charmonium dissociation due to gluons and comovers supplemented with the regeneration of J /ψ due to cc recombination [14][15][16][17]. In this scenario, a large amount of regeneration is expected at RHIC in comparison to SPS.…”

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confidence: 99%

Onset ofJ/ψmelting in a quark-gluon fluid at RHIC

et al. 2007

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A strong J /ψ suppression in central Au+Au collisions has been observed by the PHENIX experiment at the Relativistic Heavy Ion Collider. We develop a hydro+J /ψ model in which hot quark-gluon matter is described by the full (3+1)-dimensional relativistic hydrodynamics and J /ψ is treated as an impurity traversing through the matter. The experimental J /ψ suppression pattern in midrapidity is reproduced well by the sequential melting of χ c , ψ , and J /ψ in dynamically expanding fluid. The melting temperature of directly produced J /ψ is well constrained by the participant-number dependence of the J /ψ suppression and is found to be about 2T c with T c being the pseudocritical temperature.A new state of matter composed of deconfined quarks and gluons, the quark-gluon plasma (QGP), is expected to be formed in relativistic heavy-ion collisions if the system reaches a temperature larger than the critical value T c ∼ 160-190 MeV as predicted by the lattice quantum chromodynamics (QCD) [1]. To find the experimental evidence of QGP, the heavy quarkonia (J /ψ, ψ , χ c , and ϒ) have long been considered the most promising probe, because they are supposed to melt away due to the color Debye screening at sufficiently high temperature [2]. Recent lattice QCD studies show that J /ψ would survive even up to about 2T c whereas χ c and ψ would be dissociated at different temperature [3][4][5]. Therefore, the heavy quarkonia may be used as a thermometer of QGP in relativistic heavy-ion collision experiments [6].Recently, high statistics data of Au+Au collisions at the center-of-mass energy per nucleon ( √ s NN ) of 200 GeV at the Relativistic Heavy Ion Collier (RHIC) in Brookhaven National Laboratory (BNL) become available [7]. It is observed that J /ψ yield in central Au+Au collisions at RHIC is suppressed by a factor of 4 at midrapidity and 5 at forward rapidity relative to that in p+p collisions scaled by the average number of binary collisions. Cold nuclear matter (CNM) effects due to the gluon shadowing and nuclear absorption of J /ψ at the RHIC energy were evaluated from the J /ψ measurement in d+Au collisions [8]. Trend of the J /ψ suppression in d+Au collisions as a function of rapidity is reasonably well reproduced by the gluon shadowing with the Eskola-Kolhinen-Salgado (EKS) parametrization [9] and the nuclear absorption cross section σ abs ∼ 1 mb [8]. Then, a comparison of the J /ψ yield observed in Au+Au collisions at RHIC to that expected from CNM effects [10] reveals that J /ψ is anomalously suppressed in central collisions [11].So far, two scenarios have been proposed for the J /ψ suppression at RHIC energies. The first scenario is based on the sequential melting of the charmonia [12]: The J /ψ * gunji@cns.s.u-tokyo.ac.jp suppression previously observed at Super Proton Synchrotron (SPS) in European Center for Nuclear Research (CERN) may be ascribed to the complete melting of χ c and ψ and associated absence of the feed down to J /ψ, whereas at RHIC, extra melting of J /ψ could be seen due to higher initial tempera...

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“…Several theoretical predictions, tuned on already available Pb-Pb results from the NA50 experiment, were formulated for J= suppression in In-In collisions [5,7,22]. We find that none of them is able to quantitatively reproduce the suppression pattern measured by the NA60 experiment [23].…”

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confidence: 99%

J/ψProduction in Indium-Indium Collisions at158 GeV/Nucleon

Arnaldi¹,

Banicz²,

Castor³

et al. 2007

Phys. Rev. Lett.

115

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The NA60 experiment studies muon pair production at the CERN Super Proton Synchrotron. In this Letter we report on a precision measurement of J/psi in In-In collisions. We have studied the J/psi centrality distribution, and we have compared it with the one expected if absorption in cold nuclear matter were the only active suppression mechanism. For collisions involving more than approximately 80 participant nucleons, we find that an extra suppression is present. This result is in qualitative agreement with previous Pb-Pb measurements by the NA50 experiment, but no theoretical explanation is presently able to coherently describe both results.

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Quark coalescence and charm(onium) in QGP

Cited by 24 publications

References 35 publications

Dilepton measurements with NA60

Dilepton measurements with NA60

Onset ofJ/ψmelting in a quark-gluon fluid at RHIC

J/ψProduction in Indium-Indium Collisions at158 GeV/Nucleon

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