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Charged meson rapidity distributions in central Au+Au collisions at square root(sNN) = 200 GeV |
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| Authors: | Bearden I G Beavis D Besliu C Budick B Bøggild H Chasman C Christensen C H Christiansen P Cibor J Debbe R Enger E Gaardhøje J J Germinario M Hagel K Hansen O Holm A Holme A K Ito H Jipa A Jundt F Jørdre J I Jørgensen C E Karabowicz R Kim E J Kozik T Larsen T M Lee J H Lee Y K Løvhøiden G Majka Z Makeev A Mikelsen M Murray M Natowitz J Nielsen B S Norris J Olchanski K Ouerdane D Płaneta R Rami F Ristea C Röhrich D Samset B H Sandberg D Sanders S J Sheetz R A Staszel P Tveter T S Videaek F Wada R Yin Z Zgura I S;BRAHMS Collaboration |
| Institution: | Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark. |
| 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 square root(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 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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