Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Excitation Function of K$^+$ and $\pi^+$ Production in Au+Au Reactions
  at 2-10 AGeV   Positive pion and kaon production from Au+Au reactions have been measured as
a function of beam energy over the range 2.0-10.7~AGeV. Both the kaon and the
pion production cross-sections at mid-rapidity are observed to increase
steadily with beam kinetic energy. The ratio of K$^+$ to $\pi^+$ mid-rapidity
yields increases from 0.0271$\pm0.0015\pm0.0014$ at 2.0~AGeV to
0.202$\pm0.005\pm0.010$ at 10.7~AGeV and is larger than the K$^+$/$\pi^+$ ratio
from p+p reactions over the same beam energy region. There is no indication of
an onset of any new production mechanism in heavy-ion reactions in this energy
range beyond rescattering of hadrons.

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The categories of this paper are: bayes-an
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The categories of this paper are: q-alg
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
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The categories of this paper are: astro-ph