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Year of publication
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- Preprint (30) (remove)
Language
- English (30)
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Keywords
- Kollisionen schwerer Ionen (2)
- heavy ion collisions (2)
- J/ϕ (1)
- Monte-Carlo model for relativistic heavy ion collisions (1)
- QGP (1)
- QGP signals (1)
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- URQMD (1)
Institute
Bravina, Larissa ; Zabrodin, Eugene E. ; Bass, Steffen A. ; Fäßler, Amand ; Fuchs, Christian ; Gorenstein, Mark I. ; Greiner, Walter ; Soff, Sven ; Stöcker, Horst ; Weber, Henning
The relaxation of hot nuclear matter to an equilibrated state in the central zone of heavy-ion collisions at energies from AGS to RHIC is studied within the microscopic UrQMD model. It is found that the system reaches the (quasi)equilibrium stage for the period of 10-15 fm/c. Within this time the matter in the cell expands nearly isentropically with the entropy to baryon ratio S/A = 150 - 170. Thermodynamic characteristics of the system at AGS and at SPS energies at the endpoints of this stage are very close to the parameters of chemical and thermal freeze-out extracted from the thermal fit to experimental data. Predictions are made for the full RHIC energy square root s = 200$ AGeV. The formation of a resonance-rich state at RHIC energies is discussed.
Bravina, Larissa ; Zabrodin, Eugene E. ; Gorenstein, Mark I. ; Bass, Steffen A. ; Belkacem, Mohamed ; Bleicher, Marcus ; Brandstetter, Mathias ; Ernst, Christoph ; Fäßler, Amand ; Greiner, Walter ; Soff, Sven ; Stöcker, Horst ; Weber, Henning
The hypothesis of local equilibrium (LE) in relativistic heavy ion collisions at energies from AGS to RHIC is checked in the microscopic transport model. We find that kinetic, thermal, and chemical equilibration of the expanding hadronic matter is nearly reached in central collisions at AGS energy for t >_ fm/c in a central cell. At these times the equation of state may be approximated by a simple dependence P ~= (0.12-0.15) epsilon. Increasing deviations of the yields and the energy spectra of hadrons from statistical model values are observed for increasing bombarding energies. The origin of these deviations is traced to the irreversible multiparticle decays of strings and many-body (N >_ 3) decays of resonances. The violations of LE indicate that the matter in the cell reaches a steady state instead of idealized equilibrium. The entropy density in the cell is only about 6% smaller than that of the equilibrium state.
Local equilibrium in heavy ion collisions. Microscopic model versus statistical model analysis
(1999)
Bravina, Larissa ; Zabrodin, Eugene E. ; Gorenstein, Mark I. ; Bass, Steffen A. ; Belkacem, Mohamed ; Bleicher, Marcus ; Brandstetter, Mathias ; Ernst, Christoph ; Hofmann, Markus ; Neise, Ludwig ; Soff, Sven ; Weber, Henning ; Stöcker, Horst ; Greiner, Walter
The assumption of local equilibrium in relativistic heavy ion collisions at energies from 10.7 AGeV (AGS) up to 160 AGeV (SPS) is checked in the microscopic transport model. Dynamical calculations performed for a central cell in the reaction are compared to the predictions of the thermal statistical model. We find that kinetic, thermal and chemical equilibration of the expanding hadronic matter are nearly approached late in central collisions at AGS energy for t >= 10 fm/c in a central cell. At these times the equation of state may be approximated by a simple dependence P ~= (0.12-0.15) epsilon. Increasing deviations of the yields and the energy spectra of hadrons from statistical model values are observed for increasing energy, 40 AGeV and 160 AGeV. These violations of local equilibrium indicate that a fully equilibrated state is not reached, not even in the central cell of heavy ion collisions at energies above 10 AGeV. The origin of these findings is traced to the multiparticle decays of strings and many-body decays of resonances.
Konopka, Jens ; Bass, Steffen A. ; Bleicher, Marcus ; Brandstetter, Mathias ; Ernst, Christoph ; Gerland, Lars ; Greiner, Walter ; Soff, Sven ; Spieles, Christian ; Stöcker, Horst ; Weber, Henning ; Winckelmann, Luke Andreas
Quantum Molecular Dynamics (QMD) calculations of central collisions between heavy nuclei are used to study fragment production and the creation of collective flow. It is shown that the final phase space distributions are compatible with the expectations from a thermally equilibrated source, which in addition exhibits a collective transverse expansion. However, the microscopic analyses of the transient states in the intermediate reaction stages show that the event shapes are more complex and that equilibrium is reached only in very special cases but not in event samples which cover a wide range of impact parameters as it is the case in experiments. The basic features of a new molecular dynamics model (UQMD) for heavy ion collisions from the Fermi energy regime up to the highest presently available energies are outlined.
Reiter, Manuel ; Bratkovskaya, Elena L. ; Bleicher, Marcus ; Bauer, Wolfgang ; Cassing, Wolfgang ; Weber, Henning ; Stöcker, Horst
The isospin and strangeness dimensions of the Equation of State are explored. RIA and the SIS200 accelerator at GSI will allow to explore these regions in compressed baryonic matter. 132 Sn + 132 Sn and 100 Sn + 100 Sn collisions as well as the excitation functions of K/pi, Lambda/pi and the centrality dependence of charmonium suppression from the UrQMD and HSD transport models are presented and compared to data. Unambiguous proof for the creation of a 'novel phase of matter' from strangeness and charm yields is not in sight.
Scherer, Stefan ; Bass, Steffen A. ; Belkacem, Mohamed ; Bleicher, Marcus ; Brachmann, Jörg ; Dumitru, Adrian Bogdan ; Ernst, Christoph ; Gerland, Lars ; Hammon, Nils ; Hofmann, Markus ; Konopka, Jens ; Neise, Ludwig ; Reiter, Manuel ; Schramm, Stefan ; Soff, Sven ; Spieles, Christian ; Weber, Henning ; Zschiesche, Detlef ; Maruhn, Joachim ; Stöcker, Horst ; Greiner, Walter
Nonequilibrium models (three-fluid hydrodynamics, UrQMD, and quark molecular dynamics) are used to discuss the uniqueness of often proposed experimental signatures for quark matter formation in relativistic heavy ion collisions from the SPS via RHIC to LHC. It is demonstrated that these models - although they do treat the most interesting early phase of the collisions quite differently (thermalizing QGP vs. coherent color fields with virtual particles) -- all yield a reasonable agreement with a large variety of the available heavy ion data. Hadron/hyperon yields, including J/Psi meson production/suppression, strange matter formation, dileptons, and directed flow (bounce-off and squeeze-out) are investigated. Observations of interesting phenomena in dense matter are reported. However, we emphasize the need for systematic future measurements to search for simultaneous irregularities in the excitation functions of several observables in order to come close to pinning the properties of hot, dense QCD matter from data. The role of future experiments with the STAR and ALICE detectors is pointed out.
Spieles, Christian ; Dumitru, Adrian Bogdan ; Bass, Steffen A. ; Bleicher, Marcus ; Brachmann, Jörg ; Brandstetter, Mathias ; Ernst, Christoph ; Gerland, Lars ; Konopka, Jens ; Soff, Sven ; Weber, Henning ; Winckelmann, Luke Andreas ; Maruhn, Joachim ; Stöcker, Horst ; Greiner, Walter
We study the thermodynamic properties of infinite nuclear matter with the Ultrarelativistic Quantum Molecular Dynamics (URQMD), a semiclassical transport model, running in a box with periodic boundary conditions. It appears that the energy density rises faster than T4 at high temperatures of T approx. 200 - 300 MeV. This indicates an increase in the number of degrees of freedom. Moreover, We have calculated direct photon production in Pb+Pb collisions at 160 GeV/u within this model. The direct photon slope from the microscopic calculation equals that from a hydrodynamical calculation without a phase transition in the equation of state of the photon source.
The amount of proton stopping in central Pb+Pb collisions from 20 160 A·GeV as well as hyperon and antihyperon rapidity distributions are calcu- lated within the UrQMD model in comparison to experimental data at 40, 80 and 160 A·GeV taken recently from the NA49 collaboration. Further- more, the amount of baryon stopping at 160 A·GeV for Pb + Pb collisions is studied as a function of centrality in comparison to the NA49 data. We find that the strange baryon yield is reasonably described for central colli- sions, however, the rapidity distributions are somewhat more narrow than the data. Moreover, the experimental antihyperon rapidity distributions at 40, 80 and 160 A·GeV are underestimated by up to factors of 3 - depending on the annihilation cross section employed - which might be addressed to missing multi-meson fusion channels in the UrQMD model. PACS 25.75.+r
Winckelmann, Luke Andreas ; Bass, Steffen A. ; Bleicher, Marcus ; Brandstetter, Mathias ; Dumitru, Adrian Bogdan ; Ernst, Christoph ; Gerland, Lars ; Konopka, Jens ; Soff, Sven ; Spieles, Christian ; Weber, Henning ; Hartnack, Christoph ; Aichelin, Jörg ; Amelin, Nikolai ; Stöcker, Horst ; Greiner, Walter
The behavior of hadronic matter at high baryon densities is studied within Ultrarelativistic Quantum Molecular Dynamics (URQMD). Baryonic stopping is observed for Au+Au collisions from SIS up to SPS energies. The excitation function of flow shows strong sensitivities to the underlying equation of state (EOS), allowing for systematic studies of the EOS. Effects of a density dependent pole of the rho-meson propagator on dilepton spectra are studied for different systems and centralities at CERN energies.
Zschiesche, Detlef ; Bass, Steffen A. ; Bleicher, Marcus ; Brachmann, Jörg ; Gerland, Lars ; Paech, Kerstin ; Scherer, Stefan ; Soff, Sven ; Spieles, Christian ; Weber, Henning ; Stöcker, Horst ; Greiner, Walter
Compelling evidence for the creation of a new form of matter has been claimed to be found in Pb+Pb collisions at SPS. We discuss the uniqueness of often proposed experimental signatures for quark matter formation in relativistic heavy ion collisions. It is demonstrated that so far none of the proposed signals like J/psi meson production/suppression, strangeness enhancement, dileptons, and directed flow unambigiously show that a phase of deconfined matter has been formed in SPS Pb+Pb collisions. We emphasize the need for systematic future measurements to search for simultaneous irregularities in the excitation functions of several observables in order to come close to pinning the properties of hot, dense QCD matter from data.