Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chiral Dynamics and the $S_{11}(1535)$ Nucleon Resonance   The $SU(3)$ chiral effective lagrangian at next-to-leading order is applied
to the S-wave meson-baryon interaction in the energy range around the $\eta N$
threshold. Potentials are derived from this lagrangian and used in a coupled
channel calculation of the $\pi N$, $\eta N$, $K \Lambda$, $K \Sigma$ system in
the isospin-$1/2$, $l=0$ partial wave. Using the same parameters as obtained
from a fit to the low energy $\overline{K} N$ data it is found that a
quasi-bound $K \Sigma$-state is formed, with properties remarkably similar to
the $S_{11}(1535)$ nucleon resonance. In particular, we find a large partial
decay width into $\eta N$ consistent with the empirical data.

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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: nlin
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The categories of this paper are: cs
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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
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The categories of this paper are: gr-qc
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The categories of this paper are: chao-dyn