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

Abstract

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 thatmore » 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.« less

Authors:
;  [1];  [1]
  1. Gesellschaft fuer Schwerionenforschung mbH, Planckstrasse 1, D-64291 Darmstadt (Germany)
Publication Date:
OSTI Identifier:
20771470
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 73; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevC.73.044904; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Ivanov, Yu B, Russkikh, V N, Kurchatov Institute, Kurchatov sq. 1, RU-123182 Moscow, Toneev, V D, and Joint Institute for Nuclear Research, RU-141980 Dubna, Moscow Region. Relativistic heavy-ion collisions within three-fluid hydrodynamics: Hadronic scenario. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.044904.
Ivanov, Yu B, Russkikh, V N, Kurchatov Institute, Kurchatov sq. 1, RU-123182 Moscow, Toneev, V D, & Joint Institute for Nuclear Research, RU-141980 Dubna, Moscow Region. Relativistic heavy-ion collisions within three-fluid hydrodynamics: Hadronic scenario. United States. https://doi.org/10.1103/PhysRevC.73.044904
Ivanov, Yu B, Russkikh, V N, Kurchatov Institute, Kurchatov sq. 1, RU-123182 Moscow, Toneev, V D, and Joint Institute for Nuclear Research, RU-141980 Dubna, Moscow Region. Sat . "Relativistic heavy-ion collisions within three-fluid hydrodynamics: Hadronic scenario". United States. https://doi.org/10.1103/PhysRevC.73.044904.
@article{osti_20771470,
title = {Relativistic heavy-ion collisions within three-fluid hydrodynamics: Hadronic scenario},
author = {Ivanov, Yu B and Russkikh, V N and Kurchatov Institute, Kurchatov sq. 1, RU-123182 Moscow and Toneev, V D and Joint Institute for Nuclear Research, RU-141980 Dubna, Moscow Region},
abstractNote = {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.},
doi = {10.1103/PhysRevC.73.044904},
url = {https://www.osti.gov/biblio/20771470}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 4,
volume = 73,
place = {United States},
year = {2006},
month = {4}
}