Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scaling Features of Selected Observables at RHIC   We discuss several observables measured by PHOBOS that show common scaling
features in Cu+Cu and Au+Au collisions at RHIC energies. In particular, we
examine the centrality and energy dependence of the charged particle
multiplicity, as well as the centrality dependence of the elliptic flow at
mid-rapidity. The discrepancy between Cu+Cu and Au+Au of the final state
azimuthal asymmetry (elliptic flow), relative to the initial state geometry of
the collision, can be resolved by accounting for fluctuations in the
description of the initial geometry.

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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: cs
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The categories of this paper are: gr-qc