Phys. Rev. Lett. 87, 112305 (2001) [4 pages]Rapidity Dependence of Antiproton-to-Proton Ratios in Au+Au Collisions at √sNN = 130 GeVReceived 28 April 2001; published 24 August 2001 Measurements, with the BRAHMS detector, of the antiproton-to-proton ratio at midrapidities and forward rapidities, are presented for Au+Au reactions at √sNN = 130GeV, and for three different collision centralities. For collisions in the 0%–40% centrality range, we find N(p̅ )/N(p) = 0.64±0.04(stat)±0.06(syst) at y≈0, 0.66±0.03±0.06 at y≈0.7, and 0.41±0.04±0.06 at y≈2. The ratios are found to be nearly independent of collision centrality and transverse momentum. The antiproton and proton rapidity densities vary differently with rapidity, and indicate a significant degree of collision transparency, although a net-baryon free midrapidity plateau (Bjorken limit) is not yet reached. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.112305
DOI:
10.1103/PhysRevLett.87.112305
PACS:
25.75.-q
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