Rapidity equilibration in d + Au and Au + Au systems

Details Rapidity equilibration in d + Au and Au + Au systems Rapidity equilibration in d + Au and Au + Au systems

2005-09-12

arxiv.org/abs/hep-ph/0509108v4

Eur.Phys.J. A29 (2006) 113-118

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 4 figures; QGPTH05 Vienna; references updated

Scientific paper

10.1140/epja/i2005-10308-7

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.

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