Author： Ivanov Yu.B. Nikonov E.G. Nörenberg W.
Publisher： Akademiai Kiado
ISSN： 1219-7580
Source： Acta Physica Hungarica A, Vol.15, Iss.1-2, 2002-12, pp. : 117-130
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Abstract
The collective motion of nucleons from high-energy heavy-ion collisions is analyzed within a relativistic two-fluid model for different equations of state (EoS). As function of beam energy the theoretical slope parameter $F_y$ of the differential directed flow is in good agreement with experimental data, when calculated for the QCD-consistent EoS described by the statistical mixed-phase model. Within this model, which takes the deconfinement phase transition into account, the excitation function of the directed flow $left< P_xright> $ turns out to be a smooth function in the whole range from SIS till SPS energies. This function is close to that for pure hadronic EoS and exhibits no minimum predicted earlier for a two-phase bag-model EoS. Attention is also called to a possible formation of nucleon antiflow ($F_y<0$) at energies $gsim 100$ A$cdot$GeV.
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