Nuclear stopping and rapidity loss in Au + Au collisions at sqrt(sN N) = 62.4 GeV

I. C. Arsene, I. G. Bearden, D. Beavis, S. Bekele, C. Besliu, B. Budick, H. Bøggild, C. Chasman, C. H. Christensen, P. Christiansen, H. H. Dalsgaard, R. Debbe, J. J. Gaardhøje, K. Hagel, H. Ito, A. Jipa, E. B. Johnson, C. E. Jørgensen, R. Karabowicz, N. KatrynskaE. J. Kim, T. M. Larsen, J. H. Lee, G. Løvhøiden, Z. Majka, M. J. Murray, J. Natowitz, B. S. Nielsen, C. Nygaard, D. Pal, A. Qviller, F. Rami, C. Ristea, O. Ristea, D. Röhrich, S. J. Sanders, P. Staszel, T. S. Tveter, F. Videbæk, R. Wada, H. Yang, Z. Yin, I. S. Zgura

    Research output: Contribution to journalArticlepeer-review


    Transverse momentum spectra of protons and anti-protons measured in the rapidity range 0 < y < 3.1 from 0-10% central Au + Au collisions at sqrt(sN N) = 62.4 GeV are presented. The rapidity densities, d N / d y, of protons, anti-protons and net-protons (Np - Nover(p, ̄)) have been deduced from the spectra over a rapidity range wide enough to observe the expected maximum net-baryon density. From mid-rapidity to y = 1 the net-proton yield is roughly constant (d N / d y ∼ 10), but rises to d N / d y ∼ 25 at 2.3 < y < 3.1. The mean rapidity loss is 2.01 ± 0.14 ± 0.12 units from beam rapidity. The measured rapidity distributions are compared to model predictions. Systematics of net-baryon distributions and rapidity loss vs. collision energy are discussed.

    Original languageEnglish (US)
    Pages (from-to)267-271
    Number of pages5
    JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
    Issue number5
    StatePublished - Jun 29 2009

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics


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