(1 + 1) dimensional hydrodynamics for high-energy heavy-ion collisions

Journal Article · Mon Oct 15 04:00:00 EDT 2007 · Physics of Atomic Nuclei

DOI:https://doi.org/10.1134/S1063778807100146· OSTI ID:21077606

A (1 + 1)-dimensional hydrodynamical model in the light-cone coordinates is used to describe central heavy-ion collisions at ultrarelativistic bombarding energies. Deviations from Bjorken scaling are taken into account by choosing finite-size profiles for the initial energy density. The sensitivity of fluid-dynamical evolution to the equation of state and the parameters of initial state are investigated. Experimental constraints on the total energy of produced particles are used to reduce the number of model parameters. Spectra of secondary particles are calculated under the assumption that the transition from the hydrodynamical stage to the collisionless expansion of matter occurs at a certain freeze-out temperature. An important role of resonances in the formation of observed hadronic spectra is demonstrated. The calculated rapidity distributions of pions, kaons, and antiprotons in central Au + Au collisions at {radical}{sup s}NN = 200 GeV are compared with experimental data of the BRAHMS Collaboration. Parameters of the initial state are reconstructed for different choices of the equation of state. The best fit of these data is obtained for a soft equation of state and Gaussian-like initial profiles of the energy density, intermediate between the Landau and Bjorken limits.

• OSTI ID: 21077606
• Journal Information: Physics of Atomic Nuclei, Journal Name: Physics of Atomic Nuclei Journal Issue: 10 Vol. 70; ISSN 1063-7788; ISSN PANUEO
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANTIPROTONS
COLLISIONS
DISTRIBUTION
ENERGY DENSITY
EQUATIONS OF STATE
EVOLUTION
EXPANSION
FREEZING OUT
GEV RANGE 100-1000
GOLD IONS
HEAVY ION REACTIONS
HYDRODYNAMICS
ION-ION COLLISIONS
KAONS
LIGHT CONE
ONE-DIMENSIONAL CALCULATIONS
PARTICLE RAPIDITY
PIONS
RELATIVISTIC RANGE
RESONANCE
SCALING
SENSITIVITY
SIMULATION
SPECTRA