Centrality and system size dependence of (multi-strange) hyperons at 40A and 158A GeV: A comparison between a binary collision model and a Boltzmann + hydrodynamic hybrid model

Journal Article · Sun Nov 15 04:00:00 EST 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.80.054910· OSTI ID:21296520

Petersen, Hannah; Mitrovski, Michael ^[1]; Schuster, Tim ^[1]; Bleicher, Marcus ^[2]

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1. Frankfurt Institute for Advanced Studies, Ruth-Moufang-Strasse 1, D-60438 Frankfurt am Main (Germany)
2. Institut fuer Theoretische Physik, Goethe-Universitaet, Max-von-Laue-Strasse 1, D-60438 Frankfurt am Main (Germany)

We present results on the centrality and system size dependence of (multi-strange) hyperons in Pb+Pb collisions at 40A and 158A GeV from the Ultra-relativistic Quantum Molecular Dynamics (UrQMD-v2.3) model and a coupled Boltzmann + hydrodynamics calculation. The second approach is realized in a hybrid fashion based on UrQMD, with an intermediate hydrodynamical evolution for the hot and dense stage of the collision. This implementation allows a comparison of microscopic transport calculations with hydrodynamic simulations to explore the transition from a system that is not fully equilibrated, such as C+C or Si+Si collisions, to a supposedly fully equilibrated system, such as that created in Pb+Pb reactions. The results of our calculations are compared to measurements of the (anti-)hyperon yields at midrapidity (|y|{<=}0.5) and total multiplicities performed by the NA49 and NA57 Collaborations at 40A and 158A GeV. Furthermore, we compare our predictions to the centrality dependence of {lambda},{lambda}, and {xi}{sup -} rapidity spectra and total multiplicities at 40A and 158A GeV, where possible.

• OSTI ID: 21296520
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 80; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ATOM-ATOM COLLISIONS
CARBON
COLLISIONS
COMPARATIVE EVALUATIONS
FORECASTING
GEV RANGE
HYDRODYNAMIC MODEL
LEAD
MOLECULAR DYNAMICS METHOD
MULTIPLICITY
PARTICLE RAPIDITY
RELATIVISTIC RANGE
SILICON
SIMULATION
SPECTRA
XI MINUS PARTICLES