Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First Search for Unstable Sterile Neutrinos with the IceCube Neutrino
  Observatory   We present a search for an unstable sterile neutrino by looking for a
matter-induced signal in eight years of atmospheric $\nu_\mu$ data collected
from 2011 to 2019 at the IceCube Neutrino Observatory. Both the (stable)
three-neutrino and the 3+1 sterile neutrino models are disfavored relative to
the unstable sterile neutrino model, though with $p$-values of 2.5\% and
0.81\%, respectively, we do not observe evidence for 3+1 neutrinos with
neutrino decay. The best-fit parameters for the sterile neutrino with decay
model from this study are $\Delta m_{41}^2=6.7^{+3.9}_{-2.5}\,\rm{eV}^2$,
$\sin^2 2\theta_{24}=0.33^{+0.20}_{-0.17}$, and $g^2=2.5\pi\pm1.5\pi$, where
$g$ is the decay-mediating coupling. The preferred regions from short-baseline
oscillation searches are excluded at 90\% C.L.

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The categories of this paper are: astro-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
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The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: cond-mat
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The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
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The categories of this paper are: cs
31
The categories of this paper are: ao-sci
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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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The categories of this paper are: atom-ph