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

• DOI: 10.1103/physrevc.73.044904
• Publication Date: 2006-04-19T20:51:14Z
• Authors: Yu. B. Ivanov; V. N. Russkikh; V. D. Toneev
• Keywords: Transverse mass

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