Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single-Spin Transverse Asymmetry in Neutral Pion and Charged Hadron
  Production at PHENIX   The PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC) at
Brookhaven National Laboratory (BNL) has measured the single-spin transverse
asymmetry ($A_{N}$) for neutral pion and non-identified charged hadron
production at $x_{F}\sim 0$ over a transverse momentum range of $\sim$ 0.5 to
5.0 GeV/c from polarized proton-proton interactions at a center of mass energy
($\sqrt{s}$) of 200 GeV. The asymmetries observed are consistent with zero.

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The categories of this paper are: hep-th
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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
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The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: physics
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The categories of this paper are: nucl-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-ph
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The categories of this paper are: funct-an
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The categories of this paper are: ao-sci
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The categories of this paper are: chem-ph