Volume 74, Number 1, April 2006
|29 - 35
|08 March 2006
Rapidity equilibration and longitudinal expansion at RHIC
Institut für Theoretische Physik der Universität - Philosophenweg 16 D-69120 Heidelberg, Germany
Accepted: 14 February 2006
The evolution of net-proton rapidity spectra with in heavy relativistic systems is proposed as an indicator for local equilibration and longitudinal expansion. In a Relativistic Diffusion Model, bell-shaped distributions in central collisions at AGS energies and double-humped nonequilibrium spectra at SPS show pronounced longitudinal collective expansion when compared to the available data. The broad midrapidity valley recently discovered at RHIC in central Au + Au collisions at indicates rapid local equilibration which is most likely due to deconfinement, and fast longitudinal expansion of the locally equilibrated subsystem. A prediction is made for Au + Au at .
PACS: 25.75.-q – Relativistic heavy-ion collisions / 24.60.Ky – Fluctuation phenomena / 24.10.Jv – Relativistic models
© EDP Sciences, 2006
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