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 (P x ) 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 ≳ 100 A·GeV.
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Ivanov, Y.B., Nikonov, E.G., Nörenberg, W. et al. Directed flow of baryons from high-energy heavy-ion collisions. Acta Physica Hungarica A 15, 117–130 (2002). https://doi.org/10.1556/APH.15.2002.1-2.6
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DOI: https://doi.org/10.1556/APH.15.2002.1-2.6