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28 March 2024
 
  » pubmed » pmid11531519

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Rapidity dependence of antiproton-to-proton ratios in Au+Au collisions at square root of (sNN) = 130 GeV
I G Bearden ; D Beavis ; C Besliu ; Y Blyakhman ; J Brzychczyk ; B Budick ; H Bøggild ; C Chasman ; C H Christensen ; P Christiansen ; J Cibor ; R Debbe ; J J Gaardhøje ; K Grotowski ; K Hagel ; O Hansen ; A Holm ; A K Holme ; H Ito ; E Jakobsen ; A Jipa ; J I Jørdre ; F Jundt ; C E Jørgensen ; T Keutgen ; E J Kim ; T Kozik ; T M Larsen ; J H Lee ; Y K Lee ; G L Løvhøiden ; Z Majka ; A Makeev ; B McBreen ; M Murray ; J Natowitz ; B S Nielsen ; K Olchanski ; J Olness ; D Ouerdane ; R Planeta ; F Rami ; D Röhrich ; B H Samset ; S J Sanders ; R A Sheetz ; Z Sosin ; P Staszel ; T F Thorsteinsen ; T S Tveter ; F Videbaek ; R Wada ; A Wieloch ; I S Zgura ;
Date 10 Sep 2001
Journal Phys Rev Lett, 87 (11), 112305
AbstractMeasurements, 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.
Source PubMed, pmid11531519
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