Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Systematic Study of Directed Flow at RHIC Energies   Directed flow, v1, of charged hardons has been measured in Au-Au collisions
at RHIC for center-of-mass energies sqrt(sNN) = 19.6, 130, 62.4, and 200 GeV
using the PHOBOS detector. The large acceptance of PHOBOS for charged particles
allows measurements over the full range of pseudorapidity |eta| <5.4. The
results for a symmetric subevent method are shown at all four energies.
Comparison is made to a mixed harmonic method for the highest energy, and
compared to similar results from the STAR collaboration.

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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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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: chem-ph
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The categories of this paper are: nlin
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ph
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The categories of this paper are: q-bio
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The categories of this paper are: hep-lat