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

BRAHMS Collaboration·I. G. Bearden
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Abstract

We have measured rapidity densities dN/dy of pions and kaons over a broad rapidity range (-0.1 < y < 3.5) for central Au+Au collisions at sqrt(snn) = 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 1660 +/- 15 +/- 133 (pi+), 1683 +/- 16 +/- 135 (pi-), 286 +/- 5 +/- 23 (K+) and 242 +/- 4 +/- 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--Carruthers hydrodynamic is found to describe the bulk transport of the pions in the longitudinal direction.

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BRAHMS Collaboration, I. G. Bearden. 2004-10-27. Charged Meson Rapidity Distributions in central Au+Au Collisions at sqrt(s_nn) = 200 GeV. https://doi.org/10.1103/physrevlett.94.162301

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