Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermal hadron production in relativistic nuclear collisions   We present the status of the description of hadron production in central
nucleus-nucleus collisions within the statistical model . Extending previous
studies by inclusion of very high-mass resonances (m>2 GeV), and the up-to-now
neglected scalar $\sigma$ meson leads to an improved description of the data.
In particular, the hitherto poorly reproduced energy dependence of the K+/pi+
ratio at SPS energies ("the horn") is now well described through the connection
to the hadronic mass spectrum and, implicitly, Hagedorn's limiting temperature.

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The categories of this paper are: hep-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: physics
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The categories of this paper are: cond-mat
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The categories of this paper are: nlin
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The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-th
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The categories of this paper are: funct-an
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The categories of this paper are: math-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: q-alg
2
The categories of this paper are: math