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HK: Physik der Hadronen und Kerne

HK 27: Heavy Ions III

HK 27.5: Vortrag

Mittwoch, 13. März 2002, 12:30–12:45, E

Diffusion in relativistic systems — •Georg Wolschin — 69120 Heidelberg

Phase-transition scenarios to a quark-gluon phase are based on the assumption that at least a substantial part of the system thermalizes. In this work, the kinetic equilibration in the system of participant baryons is investigated analytically in the relativistic diffusion model (RDM, [1]) from SIS via AGS to SPS and RHIC energies.

The dissipation-fluctuation theorem (Einstein relation) is fulfilled at low SIS-energies, whereas progressively larger deviations rising to an order of magnitude are found at AGS-, SPS- and RHIC-energies. This effect is investigated as a consequence of the strong-coupling character of the system. The rapidity diffusion coefficient becomes time-dependent. Predictions for the 40 A GeV/c SPS, and 2*100 A GeV/c RHIC runs are made. In spite of the successful application of thermodynamical concepts to hadron production, the system does not reach thermal equilibrium.

[1] G. Wolschin, Eur. Phys. J. A 5 (1999) 85; Europhys. Lett. 47 (1999) 30.