Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of $\Xi(1620)^0$ and evidence for $\Xi(1690)^0$ in $\Xi_c^+
  \rightarrow \Xi^-\pi^+\pi^+$ decays   We report the first observation of the doubly-strange baryon $\Xi(1620)^0$ in
its decay to $\Xi^-\pi^+$ via $\Xi_c^+ \rightarrow \Xi^- \pi^+ \pi^+$ decays
based on a $980\,{\rm fb}^{-1}$ data sample collected with the Belle detector
at the KEKB asymmetric-energy $e^+ e^-$ collider. The mass and width are
measured to be 1610.4 $\pm$ 6.0 (stat) $^{+5.9}_{-3.5}$ (syst)~MeV$/c^2$ and
59.9 $\pm$ 4.8 (stat) $^{+2.8}_{-3.0}$ (syst)~MeV, respectively. We obtain
4.0$\sigma$ evidence of the $\Xi(1690)^0$ with the same data sample. These
results shed light on the structure of hyperon resonances with strangeness
$S=-2$.

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The categories of this paper are: adap-org
18
The categories of this paper are: econ
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: astro-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: q-alg
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The categories of this paper are: cs
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ph
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The categories of this paper are: math
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The categories of this paper are: alg-geom
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The categories of this paper are: stat