Relativistic heavy-ion collisions within three-fluid hydrodynamics: Hadronic scenario

Journal Article · Sat Apr 15 00:00:00 EDT 2006 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.73.044904· OSTI ID:20771470

Ivanov, Yu B; Russkikh, V N ^[1]; Toneev, V D ^[1]

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1. Gesellschaft fuer Schwerionenforschung mbH, Planckstrasse 1, D-64291 Darmstadt (Germany)

A three-fluid hydrodynamic model for simulating relativistic heavy-ion collisions is introduced. Along with two baryon-rich fluids, the new model considers the time-delayed evolution of a third, baryon-free (i.e., with zero net baryonic charge) fluid of newly produced particles. Its evolution is delayed because of a formation time {tau}, during which the baryon-free fluid neither thermalizes nor interacts with the baryon-rich fluids. After the formation it starts to interact with the baryon-rich fluids and quickly gets thermalized. Within this model with pure hadronic equation of state, a systematic analysis of various observables at incident energies between few and about 160A GeV has been done as well as a comparison with results of transport models. We have succeeded in reasonably reproducing a great body of experimental data in the incident energy range of E{sub lab}{approx_equal} (1-160)A GeV. The list includes proton and pion rapidity distributions, proton transverse-mass spectra, rapidity distributions of {lambda} and {lambda} hyperons, elliptic flow of protons and pions (with the exception of proton v{sub 2} at 40A GeV), multiplicities of pions, positive kaons, {phi} mesons, hyperons, and antihyperons, including multistrange particles. This agreement is achieved on the expense of substantial enhancement of the interflow friction as compared to that estimated proceeding from hadronic free cross sections. However, we have also found out certain problems. The calculated yield of K{sup -} is approximately higher than that in the experiment by a factor of 1.5. We have also failed to describe directed transverse flow of protons and pion at E{sub lab}{>=}40A GeV. This failure apparently indicates that the used EOS is too hard and thereby leaves room for a phase transition.

• OSTI ID: 20771470
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 73, Issue 4; Other Information: DOI: 10.1103/PhysRevC.73.044904; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANTIHYPERONS
COMPARATIVE EVALUATIONS
CROSS SECTIONS
EQUATIONS OF STATE
FLUIDS
GEV RANGE
HEAVY ION REACTIONS
HYDRODYNAMIC MODEL
KAONS MINUS
MASS SPECTRA
MULTIPLICITY
NUCLEAR REACTION YIELD
PARTICLE RAPIDITY
PHASE TRANSFORMATIONS
PIONS
PROTONS
RELATIVISTIC RANGE
TRANSPORT THEORY