Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing the origin of ultra-high-energy cosmic rays with neutrinos in
  the EeV energy range using the Pierre Auger Observatory   Neutrinos with energies above $10^{17}$ eV are detectable with the Surface
Detector Array of the Pierre Auger Observatory. The identification is
efficiently performed for neutrinos of all flavors interacting in the
atmosphere at large zenith angles, as well as for Earth-skimming $\tau$
neutrinos with nearly tangential trajectories relative to the earth. No
neutrino candidates were found in $\sim\,14.7$ years of data taken up to 31
August 2018. This leads to restrictive upper bounds on their flux. The $90\%$
C.L. single-flavor limit to the diffuse flux of ultra-high-energy neutrinos
with an $E_\nu^{-2}$ spectrum in the energy range $1.0 \times 10^{17}~{\rm eV}
- 2.5 \times 10^{19}~{\rm eV}$ is $E^2 {\rm d}N_\nu/{\rm d}E_\nu < 4.4 \times
10^{-9}~{\rm GeV~cm^{-2}~s^{-1}~sr^{-1}}$, placing strong constraints on
several models of neutrino production at EeV energies and on the properties of
the sources of ultra-high-energy cosmic rays.

3
The categories of this paper are: physics
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
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The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: ao-sci