Charmonium suppression with dissociation by strings

Geiss, J.; Greiner, Carsten; Bratkovskaya, E.L.; Cassing, W.; Mosel, U.

doi:10.1016/s0370-2693(98)01577-9

Cited by 56 publications

(58 citation statements)

References 28 publications

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“…In particular, the observed abnormal suppression of J /ψ in central Pb+Pb collisions at SPS has been attributed to the formation of the quark-gluon plasma in these collisions [150,151]. However, there are other possible mechanisms for J /ψ suppression in heavy ion collisions [152][153][154], e.g., J /ψ may be destroyed by collisions with incoming nucleons or with gluons in the initial partonic matter [155,156] or with comoving hadrons in the hadronic matter [157][158][159][160][161][162][163][164][165][166][167][168][169][170][171].…”

Section: G Equilibration Between J/ψ and Open Charmmentioning

confidence: 99%

Multiphase transport model for relativistic heavy ion collisions

et al. 2005

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We describe in detail how the different components of a multiphase transport (AMPT) model that uses the heavy ion jet interaction generator (HIJING) for generating the initial conditions, Zhang's parton cascade (ZPC) for modeling partonic scatterings, the Lund string fragmentation model or a quark coalescence model for hadronization, and a relativistic transport (ART) model for treating hadronic scatterings are improved and combined to give a coherent description of the dynamics of relativistic heavy ion collisions. We also explain the way parameters in the model are determined and discuss the sensitivity of predicted results to physical input in the model. Comparisons of these results to experimental data, mainly from heavy ion collisions at the BNL Relativistic Heavy Ion Collider, are then made in order to extract information on the properties of the hot dense matter formed in these collisions.

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Section: G Equilibration Between J/ψ and Open Charmmentioning

confidence: 99%

Multiphase transport model for relativistic heavy ion collisions

et al. 2005

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“…[38,39,40,41] for the charm and open charm degrees of freedom. Each high p ⊥ hadron is produced in the transport calculation with a weight W i given by the ratio of the actual production cross section divided by the inelastic nucleon-nucleon cross section, e.g.…”

Section: Numerical Implementationmentioning

confidence: 99%

Suppression of high transverse momentum hadrons at RHIC by (pre-) hadronic final state interactions

2004

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We investigate transverse hadron spectra from proton+proton, deuteron+Au and Au+Au collisions at √ s = 200 GeV and √ s = 17.3 GeV within the Hadron-StringDynamics (HSD) approach which is based on quark, diquark, string and hadronic degrees of freedom as well as Pythia calculations for the high p ⊥ spectra. The comparison to experimental data on transverse mass spectra from p+p, d+Au and Au+Au reactions shows that pre-hadronic effects are responsible for both the hardening of the spectra for low transverse momenta (Cronin effect) as well as the suppression of high p ⊥ hadrons. The interactions of formed hadrons are found to be negligible in central Au+Au collisions at √ s = 200 GeV for p ⊥ ≥ 6 GeV/c, but have some importance for the shape of the ratio R AA at lower p ⊥ values (≤ 6 GeV/c). The large suppression seen experimentally is attributed to the inelastic interactions of 'leading' pre-hadrons with the dense environment, which could be partly of colored partonic nature in order to explain the large attenuation seen in most central Au+Au collisions.

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“…Additionally, alternative absorption mechanisms might play a role, such as gluon scattering on color dipole states as suggested in Refs. [24,25,26,27] or charmonium dissociation in the strong color fields of overlapping strings [28].…”

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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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Charmonium suppression with dissociation by strings

Cited by 56 publications

References 28 publications

Multiphase transport model for relativistic heavy ion collisions

Multiphase transport model for relativistic heavy ion collisions

Suppression of high transverse momentum hadrons at RHIC by (pre-) hadronic final state interactions

Charmonium dynamics in Au+Au collisions ats=200GeV

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