Equation of State, Flow, Fluctuations and $J/ψ$ suppression

Details Equation of State, Flow, Fluctuations and $J/ψ$ suppression Equation of State, Flow, Fluctuations and $J/ψ$ suppression

1998-01-22

arxiv.org/abs/hep-ph/9801393v1

Nucl.Phys. A638 (1998) 207-218

Physics

High Energy Physics

High Energy Physics - Phenomenology

Plenary Talk at Quark Matter 97, Tsukuba, Dec.1997

Scientific paper

10.1016/S0375-9474(98)00414-X

Radial flow observed at AGS/SPS energies is very strong, with collective velocities of matter reaching about 0.5c for central collisions of the heaviest ions. The lattice-based Equation of State (EOS) is however rather soft, due to the QCD phase transition. We show that both statements are consistent only if proper kinetic-based treatment of the freeze-out is made. In fact chemical and thermal freeze-out happen at quite different conditions, especially at SPS. Event-by-event fluctuations can shed new light on this problem. We also propose new model of "anomalous" $J/\psi$ suppression found for PbPb collisions, related it to prolonged lifetime of dense matter due the "softest point" of the EOS.

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