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The directed flow maximum near cs = 0

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Abstract

We investigate the excitation function of quark-gluon plasma formation and of directed in-plane flow of nucleons in the energy range of the BNL-AGS and for the E kinLab = 40AGeV Pb + Pb collisions performed recently at the CERN-SPS. We employ the three-fluid model with dynamical unification of kinetically equilibrated fluid elements. Within our model with first-order phase transition at high density, droplets of QGP coexisting with hadronic matter are produced already at BNL-AGS energies, E kinLab ≃ 10AGeV. A substantial decrease of the isentropic velocity of sound, however, requires higher energies, E kinLab ≃ 0AGeV. We show the effect on the flow of nucleons in the reaction plane. According to our model calculations, kinematic requirements and EoS effects work hand-in-hand at E kinLab = 40AGeV to allow the observation of the dropping velocity of sound via an increase of the directed flow around midrapidity as compared to top BNL-AGS energy.

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Authors and Affiliations

  1. Institut für Theoretische Physik der J.W., Goethe-Universität, Postfach 111932, D-60054, Frankfurt am Main, Germany

    J. Brachmann, H. Stöcker & W. Greiner

  2. Physics Department, Columbia University, 704 Pupin Hall, 538W 120th Street, New York, NY, 10027, USA

    A. Dumitru

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  1. J. Brachmann
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  2. A. Dumitru
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  3. H. Stöcker
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  4. W. Greiner
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Correspondence to A. Dumitru.

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Communicated by A. Schäfer

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Brachmann, J., Dumitru, A., Stöcker, H. et al. The directed flow maximum near cs = 0. Eur. Phys. J. A 8, 549–552 (2000). https://doi.org/10.1007/s100500070077

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