Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Does parton saturation at high density explain hadron multiplicities at
  RHIC ?   We discuss the recent claim that hadron multiplicities measured at RHIC
energies are directly described in terms of gluon degrees of freedom fixed from
the initial conditions of central heavy ion collisions. The argument is based
on the parton saturation scenario expected to be valid at high parton densities
and on the assumption of conserved gluon number. Alternatively we conjecture
that "bottom-up" equilibration before hadronization modifies this picture, due
to nonconservation of the number of gluons.

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The categories of this paper are: funct-an
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The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: eess
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-lat
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The categories of this paper are: cs
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The categories of this paper are: mtrl-th
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The categories of this paper are: econ