| Issue |
Europhys. Lett.
Volume 74, Number 1, April 2006
|
|
|---|---|---|
| Page(s) | 29 - 35 | |
| Section | Nuclear physics | |
| DOI | https://doi.org/10.1209/epl/i2005-10517-0 | |
| Published online | 08 March 2006 | |
Rapidity equilibration and longitudinal expansion at RHIC
Institut für Theoretische Physik der Universität - Philosophenweg 16 D-69120 Heidelberg, Germany
Received:
10
December
2005
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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