Excitation function of energy density and partonic degrees of freedom in relativistic heavy ion collisions


Journal Article

We estimate the energy density ∈ pile-up at mid-rapidity in central Pb+Pb collisions from 1 - 200 GeV/nucleon. ∈ is decomposed into hadronic and partonic contributions. A detailed analysis of the collision dynamics in the framework of a microscopic transport model shows the importance of partonic degrees of freedom and rescattering of leading (di)quarks in the early phase of the reaction for E lab ≥ 30 GeV/nucleon. The energy density reaches up to 4 GeV/fm 3 , 95% of which are contained in partonic degrees of freedom. It is shown that cells of hadronic matter, after t ≈ 2.R/γ, can be viewed as nearly chemically equilibrated. This matter never exceeds energy densities of ∼ 1 GeV/fm -3 , i.e. a density above which the notion of separated hadrons loses its meaning.

Full Text

Duke Authors

Cited Authors

  • Weber, H; Ernst, C; Bass, SA; Spieles, C; Bleicher, M; Belkacem, M; Bravina, L; Stöcker, H; Greiner, W

Published Date

  • November 2, 1998

Published In

Volume / Issue

  • 642 / 1-2

Start / End Page

  • c121 - c129

International Standard Serial Number (ISSN)

  • 0375-9474

Digital Object Identifier (DOI)

  • 10.1016/S0375-9474(98)00507-7

Citation Source

  • Scopus