Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charge Particle Multiplicity and Transverse Energy Measurements in Au-Au
  collisions in PHENIX at RHIC   We present results on charged particle and transverse energy densities
measured at mid-rapidity in Au-Au collisions at sqrt(s_{NN})=200 GeV. The mean
transverse energy per charged particle is derived. The results are presented as
a function of centrality, which is defined by the number of participating
nucleons, and compared to results obtained in Au-Au collisions at
sqrt{s_{NN})=130 GeV. A comparison with calculations from various theoretical
models is performed.

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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: astro-ph
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The categories of this paper are: adap-org
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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: gr-qc