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    Phys Rev Lett. 2003 Aug 1;91(5):052303. Epub 2003 Aug 1.

    Significance of the fragmentation region in ultrarelativistic heavy-ion collisions.

    Back BB, Baker MD, Barton DS, Betts RR, Ballintijn M, Bickley AA, Bindel R, Budzanowski A, Busza W, Carroll A, Decowski MP, García E, George N, Gulbrandsen K, Gushue S, Halliwell C, Hamblen J, Heintzelman GA, Henderson C, Hofman DJ, Hollis RS, Hołyński R, Holzman B, Iordanova A, Johnson E, Kane JL, Katzy J, Khan N, Kucewicz W, Kulinich P, Kuo CM, Lin WT, Manly S, McLeod D, Michałowski J, Mignerey AC, Nouicer R, Olszewski A, Pak R, Park IC, Pernegger H, Reed C, Remsberg LP, Reuter M, Roland C, Roland G, Rosenberg L, Sagerer J, Sarin P, Sawicki P, Skulski W, Steadman SG, Steinberg P, Stephans GS, Stodulski M, Sukhanov A, Tang JL, Teng R, Trzupek A, Vale C, van Nieuwenhuizen GJ, Verdier R, Wadsworth B, Wolfs FL, Wosiek B, Woźniak K, Wuosmaa AH, Wysłouch B.

    Source

    Physics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843, USA.

    Abstract

    We present measurements of the pseudorapidity distribution of primary charged particles produced in Au+Au collisions at three energies, sqrt[s(NN)]=19.6, 130, and 200 GeV, for a range of collision centrali-ties. The distribution narrows for more central collisions and excess particles are produced at high pseudorapidity in peripheral collisions. For a given centrality, however, the distributions are found to scale with energy according to the "limiting fragmentation" hypothesis. The universal fragmentation region described by this scaling grows in pseudorapidity with increasing collision energy, extending well away from the beam rapidity and covering more than half of the pseudorapidity range over which particles are produced. This approach to a universal limiting curve appears to be a dominant feature of the pseudorapidity distribution and therefore of the total particle production in these collisions.

    PMID:
    12906591
    [PubMed]

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