Results from the BRAHMS experiment at RHIC

D. Röhrich, 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, M. Germinario, K. Grotowski, K. Hagel, O. Hansen, A. Holm, A. K. HolmeH. Ito, E. Jakobsen, A. Jipa, J. I. Jordre, F. Jundt, C. E. Jørgensen, T. Keutgen, E. J. Kim, T. Kozik, T. M. Larsen, J. H. Lee, Y. K. Lee, G. Løvhøiden, Z. Majka, A. Makeev, B. McBreen, M. Murray, J. Natowitz, B. S. Nielsen, K. Olchanski, J. Olness, D. Ouerdane, R. Płaneta, F. Rami, D. Röhrich, B. Samset, D. Sandberg, S. Sanders, R. A. Sheetz, Z. Sosin, P. Staszel, T. F. Thorsteinsen, T. S. Tveter, F. Videbæk, R. Wada, A. Wieloch, I. S. Zgura

    Research output: Contribution to journalArticlepeer-review


    Results from the BRAHMS Collaboration for the inaugural physics run with the relativistic heavy ion collider (RHIC), Au + Au collisions at √s NN = 130 GeV in the late summer of 2000, and some results of the very first data from the summer of 2001 at √sNN = 200 GeV are presented. Here the main focus is on the determination of the pseudorapidity distribution of charged particles as a function of collision centrality and on the measurement of the antiproton to proton and the K- to K + ratios as a function of rapidity. The pseudorapidity density at midrapidity reaches dN(ch)/dη = 553 ± 36 for the most central collisions (0-5%) at √sNN = 130 GeV; the corresponding number for a higher energy is dN(ch)/dη = 632 ± 36, demonstrating an increase in multiplicity of about 14%. The measured antiproton/proton ratios peak at midrapidity around N(p̄)/N(p) = 0.64 ± 0.06 and drop to 0. 41 ± 0.04 at y ≈ 2 for √sNN = 130 GeV reactions; the K- to K+ ratios are 0.90 ± 0.06 (y ≈ 0) and 0. 83 ± 0.1 (y ≈ 2.5).

    Original languageEnglish (US)
    Article number338
    Pages (from-to)1841-1851
    Number of pages11
    JournalJournal of Physics G: Nuclear and Particle Physics
    Issue number7
    StatePublished - Jul 2002

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics


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