Rapidity equilibration in d + Au and Au + Au systems

  • G. WolschinEmail author
Quark-Gluon-Plasma Thermalization


In a Relativistic Diffusion Model (RDM), the evolution of net-proton rapidity spectra with \( \sqrt{{s_{NN}}}\) 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 \( \sqrt{{s_{NN}}}\) = 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.


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 


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© Società Italiana di Fisica and Springer-Verlag 2006

Authors and Affiliations

  1. 1.Institut für Theoretische Physik der UniversitätHeidelbergGermany

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