Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2003-05-05
J.Phys.G30:597-606,2004
Physics
Nuclear Physics
Nuclear Theory
14 pages, revtex, 3 figures accepted version, to be published in Journal of Physics G
Scientific paper
10.1088/0954-3899/30/5/004
The various experimental data at AGS, SPS and RHIC energies on hadron particle yields for central heavy ion collisions are investigated by employing a generalized statistical density operator, that allows for a well-defined anisotropic local momentum distribution for each particle species, specified by a common streaming velocity parameter. The individual particle ratios are rather insensitive to a change in this new intensive parameter. This leads to the conclusion that the reproduction of particle ratios by a statistical treatment does not imply the existence of a fully isotropic local momentum distribution at hadrochemical freeze-out, i.e. a state of almost complete thermal equilibrium.
Greiner Carsten
Schenke Bjoern
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