Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: TeV-PeV neutrinos over the atmospheric background: originating from two
  groups of sources?   In addition to the two ~1 PeV neutrinos, the IceCube Collaboration recently
reported a detection of 26 neutrino candidates at energies from 30 TeV to 250
TeV, implying a confidence level of 4.3\sigma over the atmospheric background.
We suggest that these TeV-PeV non-atmospheric neutrinos may originate from two
groups of sources, motivated by the non-detection of neutrinos in the energy
range 250 TeV- 1 PeV in current data. If intrinsic, the non-detection of 250
TeV-1 PeV neutrinos disfavors the single power-law spectrum model for the
TeV-PeV non-atmospheric neutrinos at a confidence level of ~ 2\sigma. We then
interpret the current neutrino data with a two-component spectrum model. One
has a flat spectrum with a cutoff at the energy ~ 250 TeV and the other has a
sharp peak at ~1 PeV. The former is likely via pp collision while the latter
may be generated by the photomeson interaction.

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The categories of this paper are: hep-th
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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: hep-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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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: chem-ph
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The categories of this paper are: hep-lat