Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Search for Nucleon Decay via $n \rightarrow \bar{\nu} \pi^{0}$ and $p
  \rightarrow \bar{\nu} \pi^{+}$ in Super-Kamiokande   We present the results of searches for nucleon decay via bound neutron to
antineutrino plus pizero and proton to antineutrino plus piplus using data from
a combined 172.8 kiloton-years exposure of Super-Kamiokande-I, -II, and -III.
We set lower limits on the partial lifetime for each of these modes. For
antineutrino pizero, the partial lifetime is >1.1x10^{33} years; for
antineutrino piplus, the partial lifetime is >3.9x10^{32} years at 90%
confidence level.

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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: adap-org
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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: nucl-th
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The categories of this paper are: cond-mat
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The categories of this paper are: ao-sci
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: chao-dyn