Rapidity equilibration in d + Au and Au + Au systems
Abstract
In a Relativistic Diffusion Model (RDM), the evolution of net-proton rapidity spectra with sqrt(sNN) 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 sqrt(sNN)= 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.
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