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

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

2004-03-25

arxiv.org/abs/nucl-ex/0403050v2

Phys.Rev.Lett. 94 (2005) 162301

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 4 figures, 1 table, submitted to Physical Review Letters. Updates : data are now corrected for feed down from Lambda

Scientific paper

10.1103/PhysRevLett.94.162301

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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