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Year of publication
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- 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
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.
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.
Bass, Steffen A. ; Belkacem, Mohamed ; Bleicher, Marcus ; Brandstetter, Mathias ; Bravina, Larissa ; Ernst, Christoph ; Gerland, Lars ; Hofmann, Max ; Hofmann, Sigurd ; Konopka, Jens ; Mao, Guangjun ; Neise, Ludwig ; Soff, Sven ; Spieles, Christian ; Weber, Henning ; Winckelmann, Luke Andreas ; Stöcker, Horst ; Greiner, Walter ; Hartnack, Christoph ; Aichelin, Jörg ; Amelin, Nikolai
In this paper, the concepts of microscopic transport theory are introduced and the features and shortcomings of the most commonly used ansatzes are discussed. In particular, the Ultrarelativistic Quantum Molecular Dynamics (UrQMD) transport model is described in great detail. Based on the same principles as QMD and RQMD, it incorporates a vastly extended collision term with full baryon-antibaryon symmetry, 55 baryon and 32 meson species. Isospin is explicitly treated for all hadrons. The range of applicability stretches from E lab < 100$ MeV/nucleon up to E lab> 200$ GeV/nucleon, allowing for a consistent calculation of excitation functions from the intermediate energy domain up to ultrarelativistic energies. The main physics topics under discussion are stopping, particle production and collective flow.
Bleicher, Marcus ; Belkacem, Mohamed ; Ernst, Christoph ; Weber, Henning ; Gerland, Lars ; Spieles, Christian ; Bass, Steffen A. ; Stöcker, Horst ; Greiner, Walter
We perform an event-by-event analysis of the transverse momentum distribution of final state particles in central Pb(160AGeV)+Pb collisions within a microscopic non-equilibrium transport model (UrQMD). Strong influence of rescattering is found. The extracted momentum distributions show less fluctuations in A+A collisions than in p+p reactions. This is in contrast to simplified p+p extrapolations and random walk models.
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.
Bratkovskaya, Elena L. ; Bleicher, Marcus ; Dumitru, Adrian Bogdan ; Paech, Kerstin ; Reiter, Manuel ; Soff, Sven ; Stöcker, Horst ; Weber, Henning ; Leeuwen, Marco van ; Cassing, Wolfgang
We investigate hadron production and transverse hadron spectra in nucleus-nucleus collisions from 2 A·GeV to 21.3 A·TeV within two independent transport approaches (UrQMD and HSD) based on quark, diquark, string and hadronic degrees of freedom. The enhancement of pion production in central Au+Au (Pb+Pb) collisions relative to scaled pp collisions (the ’kink’) is described well by both approaches without involving a phase transition. However, the maximum in the K+ p+ ratio at 20 to 30 A·GeV (the ’horn’) is missed by ~ 40%. Also, at energies above ~5 A·GeV, the measured K± mT-spectra have a larger inverse slope than expected from the models. Thus the pressure generated by hadronic interactions in the transport models at high energies is too low. This finding suggests that the additional pressure - as expected from lattice QCD at finite quark chemical potential and temperature - might be generated by strong interactions in the early pre-hadronic/partonic phase of central heavy-ion collisions. Finally, we discuss the emergence of density perturbations in a first-order phase transition and why they might affect relative hadron multiplicities, collective flow, and hadron mean-free paths at decoupling. A minimum in the collective flow v2 excitation function was discovered experimentally at 40 A·GeV - such a behavior has been predicted long ago as signature for a first order phase transition.
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.
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.
Bleicher, Marcus ; Amelin, Nikolai ; Bass, Steffen A. ; Brandstetter, Mathias ; Dumitru, Adrian Bogdan ; Ernst, Christoph ; Gerland, Lars ; Konopka, Jens ; Spieles, Christian ; Weber, Henning ; Winckelmann, Luke Andreas ; Stöcker, Horst ; Greiner, Walter
The microscopic phasespace approach URQMD is used to investigate the stopping power and particle production in heavy systems at SPS and RHIC energies. We find no gap in the baryon rapidity distribution even at RHIC. For CERN energies URQMD shows a pile up of baryons and a supression of multi-nucleon clusters at midrapidity.