Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: ANTARES Constrains a Blazar Origin of Two IceCube PeV Neutrino Events   The source(s) of the neutrino excess reported by the IceCube Collaboration is
unknown. The TANAMI Collaboration recently reported on the multiwavelength
emission of six bright, variable blazars which are positionally coincident with
two of the most energetic IceCube events. Objects like these are prime
candidates to be the source of the highest-energy cosmic rays, and thus of
associated neutrino emission. We present an analysis of neutrino emission from
the six blazars using observations with the ANTARES neutrino telescope.The
standard methods of the ANTARES candidate list search are applied to six years
of data to search for an excess of muons --- and hence their neutrino
progenitors --- from the directions of the six blazars described by the TANAMI
Collaboration, and which are possibly associated with two IceCube events. Monte
Carlo simulations of the detector response to both signal and background
particle fluxes are used to estimate the sensitivity of this analysis for
different possible source neutrino spectra. A maximum-likelihood approach,
using the reconstructed energies and arrival directions of through-going muons,
is used to identify events with properties consistent with a blazar origin.Both
blazars predicted to be the most neutrino-bright in the TANAMI sample
(1653$-$329 and 1714$-$336) have a signal flux fitted by the likelihood
analysis corresponding to approximately one event. This observation is
consistent with the blazar-origin hypothesis of the IceCube event IC14 for a
broad range of blazar spectra, although an atmospheric origin cannot be
excluded. No ANTARES events are observed from any of the other four blazars,
including the three associated with IceCube event IC20. This excludes at a 90\%
confidence level the possibility that this event was produced by these blazars
unless the neutrino spectrum is flatter than $-2.4$.

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The categories of this paper are: physics
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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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The categories of this paper are: math
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The categories of this paper are: nucl-th
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The categories of this paper are: patt-sol
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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: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: cond-mat