Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First search for atmospheric and extraterrestrial neutrino-induced
  cascades with the IceCube detector   We report on the first search for atmospheric and for diffuse astrophysical
neutrino-induced showers (cascades) in the IceCube detector using 257 days of
data collected in the year 2007-2008 with 22 strings active. A total of 14
events with energies above 16 TeV remained after event selections in the
diffuse analysis, with an expected total background contribution of $8.3\pm
3.6$. At 90% confidence we set an upper limit of
$E^2\Phi_{90%CL}<3.6\times10^{-7} GeV \cdot cm^{-2} \cdot s^{-1}\cdot sr^{-1} $
on the diffuse flux of neutrinos of all flavors in the energy range between 24
TeV and 6.6 PeV assuming that $\Phi \propto E^{-2}$ and that the flavor
composition of the $\nu_e : \nu_\mu : \nu_\tau$ flux is $1 : 1 : 1$ at the
Earth. The atmospheric neutrino analysis was optimized for lower energies. A
total of 12 events were observed with energies above 5 TeV. The observed number
of events is consistent with the expected background, within the uncertainties.

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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
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The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
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The categories of this paper are: econ
1
The categories of this paper are: cs
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The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: mtrl-th