Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Secondary Decays in Atmospheric Charm Contributions to the Flux of Muons
  and Muon Neutrinos   We present a calculation of the fluxes of muons and muon neutrinos from the
decays of pions and kaons that are themselves the decay products of charmed
particles produced in the atmosphere by cosmic ray-air collisions. Using the
perturbative cross section for charm production, these lepton fluxes are two to
three orders of magnitude smaller than the fluxes from the decays of pions and
kaons directly produced in cosmic ray-air collisions. Intrinsic charm models do
not significantly alter our conclusions, nor do models with a charm cross
section enhanced in the region above an incident cosmic ray energy of 1 TeV.

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The categories of this paper are: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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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: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: q-alg
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The categories of this paper are: ao-sci
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: eess