Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-pT Neutral Pion Production in Heavy Ion Collisions at SPS and RHIC   Transverse momentum spectra for neutral pions have been measured by the WA98
experiment in sqrt{s_{nn}}=17.3 GeV Pb+Pb collisions at the CERN SPS and by the
PHENIX experiment in sqrt{s_{nn}}=130 GeV Au+Au collisions at RHIC. The neutral
pion yields in central collisions for both reaction systems are compared to
scaled transverse momentum spectra for nucleon-nucleon reactions at the
respective energy. At SPS energies neutral pion production at high $p_T$ is
enhanced compared to the n+n reference while at RHIC a significant suppression
of high-pT neutral pions is observed.

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The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
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The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
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The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics