Rapidity equilibration in d + Au and Au + Au systems
Institut für Theoretische Physik der Universität, D-69120, Heidelberg, Germany
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Accepted: 2 January 2006
Published online: 28 August 2006
In a Relativistic Diffusion Model (RDM), the evolution of net-proton rapidity spectra with in heavy systems is proposed as an indicator for local equilibration and longitudinal expansion. The broad midrapidity valley recently discovered at RHIC in central Au + Au collisions at = 200 GeV suggests rapid local equilibration which is most likely due to deconfinement, and fast longitudinal expansion. Rapidity spectra of produced charged hadrons in d + Au and Au + Au systems at RHIC energies and their centrality dependence are well described in a three-sources RDM. In central collisions, about 19% of the produced particles are in the equilibrated midrapidity region for d + Au.
PACS: 25.75.-q Relativistic heavy-ion collisions – / 24.60.Ky Fluctuation phenomena – / 24.10.Jv Relativistic models – / 05.40.-a Fluctuation phenomena, random processes, noise, and Brownian motion –
© Società Italiana di Fisica and Springer-Verlag, 2006