Hadron freeze-out conditions in high energy nuclear collisions

Abstract

Systematic trend of the hadron freeze-out conditions from AGS/SPS to RHIC is discussed. The most interesting results from collisions at RHIC are that the system is indeed approaching net-baryon free and the transverse expansion is much stronger than that from collisions at AGS/SPS energies. In order to understand the trend of the collective velocity, an energy scan between $\sqrt{s_{NN}}=20-200GeV,isimportant.Inaddition,systematicstudiesontheanisotropyparameter$v_2$andthetransversemomentumdistributionsof$ϕ, Ω,$and$J / ψ$ are necessary as they will help in determining whether the collectivity is developed at the partonic stage.

Talk presented at the Quark Matter 2001 conference, 8 pages, 8 figures. To appear in Nucl. Phys. A

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