Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Energy Scan Program at the Cern SPS and An Observation of the
  Deconfinement Phase Transition in Nucleus--Nucleus Collisions   The history and the main results of the energy scan program at the CERN SPS
are reviewed. Several anomalies in energy dependence of hadron production
predicted as signals of deconfinement phase transition are observed and they
indicate that the onset of deconfinement is located at about 30 A GeV. For the
first time we seem to have clear evidence for the existence of a deconfined
state of matter in nature.

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The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg