Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Proton-proton Cross Section at sqrt(s) \sim 30 TeV   There are both theoretical and experimental uncertainties in using data from
cosmic-ray air showers to estimate hadronic cross sections above accelerator
energies. We outline these problems and compare the physics used to extract
\sigma_{pp}^{tot} from air shower data to the widely used parameterization of
the proton-proton cross section of Donnachie and Landshoff and other
contemporary models. We conclude that the published cosmic-ray cross section
values do not strongly constrain \sigma_{pp}^{tot} fits from lower energy
accelerator data.

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The categories of this paper are: hep-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
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The categories of this paper are: math
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The categories of this paper are: cond-mat
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The categories of this paper are: stat
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The categories of this paper are: supr-con
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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas