Rapidity dependence of antiproton-to-proton ratios in Au+Au collisions at square root of (sNN) = 130 GeV.

Journal: Physical Review Letters

Published: April 28, 2001

Abstract

Measurements, with the BRAHMS detector, of the antiproton-to-proton ratio at midrapidities and forward rapidities, are presented for Au+Au reactions at square root of [s(NN)] = 130 GeV, and for three different collision centralities. For collisions in the 0%-40% centrality range, we find N(&pmacr;)/N(p) = 0.64+/-0.04((stat))+/-0.06((syst)) at y approximately 0, 0.66+/-0.03+/-0.06 at y approximately 0.7, and 0.41+/-0.04+/-0.06 at y approximately 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.

Authors

I Bearden, D Beavis, C Besliu, Y Blyakhman, J Brzychczyk, B Budick, H Bøggild, C Chasman, C Christensen, P Christiansen, J Cibor, R Debbe, J Gaardhøje, K Grotowski, K Hagel, O Hansen, A Holm, A Holme, H Ito, E Jakobsen, A Jipa, J Jørdre, F Jundt, C Jørgensen, T Keutgen, E Kim, T Kozik, T Larsen, J Lee, Y Lee, G Løvhøiden, Z Majka, A Makeev, B Mcbreen, M Murray, J Natowitz, B Nielsen, K Olchanski, J Olness, D Ouerdane, R Planeta, F Rami, D Röhrich, B Samset, S Sanders, R Sheetz, Z Sosin, P Staszel, T Thorsteinsen, T Tveter, F Videbaek, R Wada, A Wieloch, I Zgura

Rapidity dependence of antiproton-to-proton ratios in Au+Au collisions at square root of (sNN) = 130 GeV.

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