Manifestations of high density QCD in the first RHIC data

Physics – Nuclear Physics – Nuclear Theory

Scientific paper

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15 pages, 7 figures; final journal version - 3 typos corrected, discussion extended

Scientific paper

10.1016/S0370-2693(01)01309-0

We derive a simple analytical scaling function which embodies the predictions of high density QCD on the energy, centrality, rapidity, and atomic number dependences of hadron multiplicities in nuclear collisions. Both centrality and rapidity dependences of hadron multiplicity in $Au-Au$ collisions as measured at RHIC at $\sqrt{s}= 130 {GeV}$ are well described in this approach. The centrality and rapidity dependences of hadron multiplicity at $\sqrt{s}= 200 \ {GeV}$ run at RHIC are predicted; the variation of these dependences with energy appear different from other approaches, and can be used as an important test of the ideas based on parton saturation and classical Chromo-Dynamics.

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