Charged Meson Rapidity Distributions in central Au+Au Collisions at sqrt(s_nn) = 200 GeV

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  • 25 March 2004
Abstract
We have measured rapidity densities dN/dy of pi+/- and K+/- over a broad rapidity range (-0.1 < y < 3.5) for central Au+Au collisions at sqrt(s_nn) = 200 GeV. 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 1742 +/- 17 +/- 140 (pi+), 1761 +/- 16 +/- 141 (pi-), 288 +/- 5 +/- 23 (K+) and 241 +/- 3 +/- 19 (K-). The systematics of the strange to non--strange meson ratios are found to track the variation of the baryo--chemical potential with rapidity and energy. Landau--like hydrodynamic is found to describe the bulk transport of the pions in the longitudinal direction.

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