Statistical hadronization as a snapshot of a dynamical fireball evolution

Renk, Thorsten

doi:10.1103/physrevc.68.064901

Cited by 7 publications

(4 citation statements)

References 33 publications

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“…It is the purpose of the present paper to show that such a description can be achieved in the case of 158 A GeV Pb-Pb and Pb-Au collisions at the CERN SPS. We summarize and expand on the results of [4][5][6][7][8][9][10] by developing a framework based on the EoS determined in lattice QCD. Using eikonal calculations to constrain the initial state and measured bulk hadronic properties to establish the final state, we parametrize the evolution in between in a way that is motivated by hydrodynamical calculations.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive description of multiple observables in heavy-ion collisions at SPS

Renk¹

2004

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

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Combining and expanding on work from previous publications, a model for the evolution of ultrarelativistic heavy-ion collisions at the CERN SPS for 158 AGeV beam energy is presented. Based on the assumption of thermalization and a parametrization of the space-time expansion of the produced matter, this model is able to describe a large set of observables including hadronic momentum spectra, correlations and abundancies, the emission of real photons, dilepton radiation and the suppression pattern of charmonia. Each of these obervables provides unique capabilities to study the reaction dynamics and taken together they form a strong and consistent picture of the evolving system. Based on the emission of hard photons, we argue that a strongly interacting, hot and dense system with temperatures above 250 MeV has to be created early in the reaction. Such a system is bound to be different from hadronic matter and likely to be a quark-gluon plasma, and we find that this assumption is in line with the subsequent evolution of the system that is reflected in other observables.

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Section: Introductionmentioning

confidence: 99%

A comprehensive description of multiple observables in heavy-ion collisions at SPS

Renk¹

2004

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

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“…The fact that the four-pion processes contribute all the way down to T f translates into an upper limit to their contribution, as microscopic descriptions of the dynamics (see, for example, [19]) suggest a sequential decoupling of the different channels. The equation of state in the hadronic phase and the chemical potentials µ π , µ K are inferred from statistical model calculations as described in [13,20]. The resulting fireball has a peak temperature of about 250 MeV and a lifetime of about 7.5 fm/c.…”

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Low Mass Dimuons Produced in Relativistic Nuclear Collisions

et al. 2008

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The NA60 experiment has measured low mass muon pair production in In-In collisions at 158A GeV with unprecedented precision. We show that these data are reproduced very well by a dynamical model with parameters scaled from fits to measurements of hadronic transverse mass spectra and Hanbury Brown-Twiss correlations in Pb-Pb and Pb-Au collisions at the same energy. The data are consistent with in-medium properties of rho and omega mesons at finite temperature and density as deduced from empirical forward-scattering amplitudes. Inclusion of the vacuum decay of the rho meson after freeze-out is necessary for an understanding of the mass and transverse momentum spectrum of dimuons with M less similar 0.9 GeV/c(2).

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“…Our strategy is now as follows: Knowing the number of final-state charged hadrons within a given rapidity interval, dN ch /dy, we can extrapolate by means of the statistical hadronization model [26,27] to the thermal abundances of hadrons produced at the critical temperature T c . We can then determine the total number and flavor distribution of valence quarks contained in these hadrons.…”

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Possible resolutions of theD-puzzle

et al. 2005

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We propose possible ways of explaining the net charge event-by-event fluctuations in Au+Au collisions at the Relativistic Heavy Ion Collider within a quark recombination model. We discuss various methods of estimating the number of quarks at recombination and their implications for the predicted net charge fluctuations. We also discuss the possibility of diquark and quark-antiquark clustering above the deconfinement temperature.Fluctuations of the net electric charge of all particles emitted into a specified rapidity window have been proposed as a possible signal for the formation of deconfined quark matter in relativistic heavy ion collisions [1,2]. The argument at the basis of this proposal is that charge fluctuations in a quark-gluon plasma are expected to be significantly smaller (by a factor 3−4) than in a hadronic gas. Because the net charge contained in a given volume is locally conserved and can only be changed by particle diffusion, thermal fluctuations generated within the deconfined phase could survive hadronization and final state interactions. Quantitative estimates of the diffusion of net charge showed that the survival of these fluctuations from an early stage of the collision requires a moderately large rapidity window [3].The most widely used measure for the entropy normalized net charge fluctuations is the D measure [2]:where (∆Q) 2 denotes the event-by-event net charge fluctuation within a given rapidity window ∆y, and N ch is the total number of charged particles emitted in this window. For a free plasma of quarks and gluons D ≈ 1, while for a free pion gas D ≈ 4. For the comparison with experimental data a number of corrections for acceptance and global charge conservation must be applied to the expression for D [4]. The relation of the D-measure to other measures of net charge fluctuations has been discussed by various authors [5,6,7].Several experiments have measured net charge fluctuations in heavy ion collisions at the CERN Super-Proton Synchrotron (SPS) and at the Relativistic Heavy Ion Collider (RHIC) in Brookhaven [8,9,10,11]. The results for D are generally somewhat smaller than 4, but much larger than the value predicted for a free quark-gluon gas. For example, the STAR collaboration has measured D = 2.8 ± 0.05 in central Au+Au collisions at √ s N N = 130 GeV [8], before applying corrections for global charge conservation and other effects [4]. The PHENIX experiment measured net charge fluctuations in a limited azimuthal acceptance window around midrapidity, which extrapolate to a value D ≈ 3 [9]. These results are surprising, because many other observables indicate that a deconfined quark-gluon plasma is formed in these collisions.Bia las has argued that the measured values of D could be compatible with the net charge fluctuations in a deconfined quark phase, if hadronization proceeds according to simple valence quark counting rules [12] and if gluons do not play an active role in the hadronization. Indeed, hadron abundances measured in relativistic heavy ion collisions at the SPS ...

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Statistical hadronization as a snapshot of a dynamical fireball evolution

Cited by 7 publications

References 33 publications

A comprehensive description of multiple observables in heavy-ion collisions at SPS

A comprehensive description of multiple observables in heavy-ion collisions at SPS

Low Mass Dimuons Produced in Relativistic Nuclear Collisions

Possible resolutions of theD-puzzle

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