Dear Collaborator, the Phobos people have written up a PRL with the 'rule X' from qm on limiting fragmentation. The abstract is included the paper itself is not yet available. Flemming ------------------------------------------------------ Flemming Videbaek Physics Department Brookhaven National Laboratory tlf: 631-344-4106 fax 631-344-1334 e-mail: videbaek@bnl.gov ----- Original Message ----- From: "Wit Busza" <busza@MIT.EDU> To: <tkirk@bnl.gov> Cc: <hallman@bnl.gov>; <videbaek@bnl.gov>; <zajc@columbia.edu> Sent: Wednesday, September 25, 2002 6:23 PM > Dear Tom, > In a week's time the Phobos collaboration is planning to submit the > following paper to PRL: > > > The significance of the fragmentation region in ultrarelativistic heavy > ion collisions. > > 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 > centralities. The centrality dependence is shown to be non-trivial: > 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. > > > > The results in this paper are essentially the same as those shown by > Mark Baker at QM2002. > > All the best, > Wit
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