Charged Meson Rapidity Distributions in Central Au+Au Collisions at sNN=200GeV

I. G. Bearden et al. (BRAHMS Collaboration)
Phys. Rev. Lett. 94, 162301 – Published 28 April 2005

Abstract

We have measured rapidity densities dN/dy of π± and K± over a broad rapidity range (0.1<y<3.5) for central Au+Au collisions at sNN=200GeV. These data have significant implications for the chemistry and dynamics of the dense system that is initially created in the collisions. The full phase-space yields are 1660±15±133 (π+), 1683±16±135 (π), 286±5±23 (K+), and 242±4±19 (K). The systematics of the strange to nonstrange meson ratios are found to track the variation of the baryochemical potential with rapidity and energy. Landau-Carruthers hydrodynamics is found to describe the bulk transport of the pions in the longitudinal direction.

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  • Received 24 March 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.162301

©2005 American Physical Society

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Vol. 94, Iss. 16 — 29 April 2005

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