Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the non-detection of Glashow resonance in IceCube   Electron anti-neutrinos at the Glashow resonance (GR, at $E_{\bar \nu_e} \sim
6.3$ PeV) have an enhanced probability to be detected. With three neutrinos
detected by IceCube in the (1-2) PeV energy range at present, one would expect
that about 1 to 4 GR $\bar\nu_e$ should have been detected. The high-energy
$\sim 8.7$ PeV muon neutrino detected by IceCube may not be a GR event. If so,
we expect to detect 50 to 70 GR $\bar\nu_e$, then one would have a "missing
Glashow-resonance problem". This would suggest (1) that $p\gamma$ interaction
rather than $pp$ interaction is the dominant channel to produce the observed
IceCube high-energy neutrinos, (2) that multi-pion $p\gamma$ interactions are
suppressed, and (3) that the magnetic field and photon energy density in the
$p\gamma$ emission region is such that significant $\mu^+$ cooling occurs
before decaying, yet $\pi^+$'s essentially do not cool before decaying.

36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
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The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
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The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph