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  • Greiner, Carsten (40)
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  • Spieles, Christian (11)
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Hypermatter : properties and formation in relativistic nuclear collisions (1995)
Gerland, Lars ; Spieles, Christian ; Bleicher, Marcus ; Papazoglou, Panajotis ; Brachmann, Jörg ; Dumitru, Adrian ; Stöcker, Horst ; Greiner, Walter ; Schaffner, Jürgen ; Greiner, Carsten
The extension of the Periodic System into hitherto unexplored domains - anti- matter and hypermatter - is discussed. Starting from an analysis of hyperon and single hypernuclear properties we investigate the structure of multi-hyperon objects (MEMOs) using an extended relativistic meson field theory. These are contrasted with multi-strange quark states (strangelets). Their production mechanism is stud- ied for relativistic collisions of heavy ions from present day experiments at AGS and SPS to future opportunities at RHIC and LHC. It is pointed out that abso- lutely stable hypermatter is unlikely to be produced in heavy ion collisions. New attention should be focused on short lived metastable hyperclusters ( / 10 10s) and on intensity interferometry of multi-strange-baryon correlations.
Hadron production from a hadronizing quark-gluon plasma (1997)
Spieles, Christian ; Stöcker, Horst ; Greiner, Carsten
Measured hadron yields from relativistic nuclear collisions can be equally well understood in two physically distinct models, namely a static thermal hadronic source versus a time-dependent, non-equilibrium hadronization off a quark gluon plasma droplet. Due to the time-dependent particle evaporation off the hadronic surface in the latter approach the hadron ratios change (by factors of / 5) in time. The overall particle yields then reflect time averages over the actual thermodynamic properties of the system at a certain stage of evolution.
Search for production of strangelets in quark matter using particle correlations (1997)
Soff, Sven ; Ardouin, Daniel ; Spieles, Christian ; Bass, Steffen A. ; Stöcker, Horst ; Gourio, David ; Schramm, Stefan ; Greiner, Carsten ; Lednicky, Richard ; Lyuboshitz, Vladimir Lvovich ; Coffin, Jean Pierre ; Kuhn, Christian
We present a new technique for observing the strangelet production in quark matter based on unlike particle correlations. A simulation is presented with a two-phase thermodynamical model.
Unlike particle correlations and the strange quark matter distillation process (2002)
Ardouin, Daniel ; Soff, Sven ; Spieles, Christian ; Bass, Steffen A. ; Stöcker, Horst ; Gourio, David ; Schramm, Stefan ; Greiner, Carsten ; Lednicky, Richard ; Lyuboshits, Vladimir Lvovich ; Coffin, Jean Pierre ; Kuhn, Christian
We present a new technique for observing the strange quark matter distillation process based on unlike particle correlations. A simulation is presented based on the scenario of a two-phase thermodynamical evolution model.
Heavy quarks and charmonium at RHIC and LHC within a partonic transport model (2011)
Uphoff, Jan ; Zhou, Kai ; Fochler, Oliver ; Xu, Zhe ; Greiner, Carsten
Heavy quark and charmonium production as well as their space-time evolution are studied in transport simulations of heavy-ion collisions at RHIC and LHC. In the partonic transport model Boltzmann Approach of MultiParton Scatterings (BAMPS) heavy quarks can be produced in initial hard parton scatterings or during the evolution of the quark-gluon plasma. Subsequently, they interact with the medium via binary scatterings with a running coupling and a more precise Debye screening which is derived from hard thermal loop calculations, participate in the flow and lose energy. We present results of the elliptic flow and nuclear modification factor of heavy quarks and compare them to available data. Furthermore, preliminary results on J/psi suppression at forward and mid-rapidity are reported for central and non-central collisions at RHIC. For this, we study cold nuclear matter effects and the dissociation as well as regeneration of J/psi in the quark-gluon plasma. XLIX International Winter Meeting on Nuclear Physics 24-28 January 2011 BORMIO, Italy
Transition from ideal to viscous Mach cones in a partonic transport model (2013)
Bouras, Ioannis ; El, Andrej ; Fochler, Oliver ; Niemi, Harri ; Xu, Zhe ; Greiner, Carsten
Using a partonic transport model we investigate the evolution of conical structures in ultrarelativistic matter. Using two different source terms and varying the transport properties of the matter we study the formation of Mach Cones. Furthermore, in an additional study we extract the two-particle correlations from the numerical calculations and compare them to an analytical approximation. The influence of the viscosity to the shape of Mach Cones and the corresponding two-particle correlations is studied by adjusting the cross section of the medium.
Hagedorn states and thermalization : XLIX International Winter Meeting on Nuclear Physics, 24 - 28 January 2011, Bormio, Italy (2011)
Greiner, Carsten ; Noronha-Hostler, Jacquelyn ; Noronha, Jorge
In recent years, Hagedorn states have been used to explain the equilibrium and transport properties of a hadron gas close to the QCD critical temperature. These massive resonances are shown to lower h/s to near the AdS/CFT limit close to the phase transition. A comparison of the Hagedorn model to recent lattice results is made and it is found that the hadrons can reach chemical equilibrium almost immediately, well before the chemical freeze-out temperatures found in thermal fits for a hadron gas without Hagedorn states.
Dissipative hydrodynamics for multi-component systems (2012)
El, Andrej ; Bouras, Ioannis ; Wesp, Christian ; Xu, Zhe ; Greiner, Carsten
Second-order dissipative hydrodynamic equations for each component of a multi-component system are derived using the entropy principle. Comparison of the solutions with kinetic transport results demonstrates validity of the obtained equations. We demonstrate how the shear viscosity of the total system can be calculated in terms of the involved cross-sections and partial densities. The presence of the inter-species interactions leads to a characteristic time dependence of the shear viscosity of the mixture, which also means that the shear viscosity of a mixture cannot be calculated using the Green-Kubo formalism the way it has been done recently. This finding is of interest for understanding of the shear viscosity of a quark-gluon plasma extracted from comparisons of hydrodynamic simulations with experimental results from RHIC and LHC.
RHIC and LHC phenomena with an unified parton transport (2012)
Bouras, Ioannis ; El, Andrej ; Fochler, Oliver ; Reining, Felix ; Senzel, Florian ; Uphoff, Jan ; Wesp, Christian ; Xu, Zhe ; Greiner, Carsten
We discuss recent applications of the partonic pQCD based cascade model BAMPS with focus on heavy-ion phenomeneology in hard and soft momentum range. The nuclear modification factor as well as elliptic flow are calculated in BAMPS for RHIC end LHC energies. These observables are also discussed within the same framework for charm and bottom quarks. Contributing to the recent jet-quenching investigations we present first preliminary results on application of jet reconstruction algorithms in BAMPS. Finally, collective effects induced by jets are investigated: we demonstrate the development of Mach cones in ideal matter as well in the highly viscous regime.
Dynamics of strange, charm and high momentum hadrons in relativistic nucleus nucleus collisions (2003)
Cassing, Wolfgang ; Gallmeister, Kai ; Bratkovskaya, Elena L. ; Greiner, Carsten ; Stöcker, Horst
We investigate hadron production and attenuation of hadrons with strange and charm quarks (or antiquarks) as well as high transverse momentum hadrons in relativistic nucleus-nucleus col- lisions from 2 A·GeV to 21.3 A·TeV within two independent transport approaches (UrQMD and HSD). Both transport models are based on quark, diquark, string and hadronic degrees of freedom, but do not include any explicit phase transition to a quark-gluon plasma. From our dynamical calculations we find that both models do not describe the maximum in the K+/ + ratio at 20 - 30 A·GeV in central Au+Au collisions found experimentally, though the excitation functions of strange mesons are reproduced well in HSD and UrQMD. Furthermore, the transport calculations show that the charmonium recreation by D + J/ + meson reactions is comparable to the dissociation by comoving mesons at RHIC energies contrary to SPS energies. This leads to the final result that the total J/ suppression as a function of centrality at RHIC should be less than the suppression seen at SPS energies where the comover dissociation is substantial and the backward channels play no role. Furthermore, our transport calculations in comparison to exper- imental data on transverse momentum spectra from pp, d+Au and Au+Au reactions show that pre-hadronic e ects are responsible for both the hardening of the hadron spectra for low transverse momenta (Cronin e ect) as well as the suppression of high pT hadrons. The mutual interactions of formed hadrons are found to be negligible in central Au+Au collisions at s = 200 GeV for pT e 6 GeV/c and the sizeable suppression seen experimentally is attributed to a large extent to the interactions of leading pre-hadrons with the dense environment.
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