Showing papers by "Peter Christiansen published in 2001"
TL;DR: In this article, the BRAHMS detector was used to measure the antiproton-proton ratio at mid-rapidities and forward rapidities for Au+Au reactions at s{sub NN}=130 GeV, and for three different collision centralities.
Abstract: Measurements, with the BRAHMS detector, of the antiproton-to-proton ratio at midrapidities and forward rapidities, are presented for Au+Au reactions at s{sub NN}=130 GeV , and for three different collision centralities. For collisions in the 0%--40% centrality range, we find N({bar p})/N(p)=0.64{+-} 0.04{sub (stat)}{+-}0.06{sub ( syst)} at y{approx}0 , 0.66{+-}0.03{+-}0.06 at y{approx}0.7 , and 0.41{+-}0.04{+-}0.06 at y{approx}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.
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