Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Why $\Xi(1690)$ and $\Xi(2120)$ are so narrow?   The $\Xi$ baryons are expected to be naturally narrower as compared to their
nonstrange and strange counterparts since they have only one light quark and,
thus, their decay involves producing either a light meson and doubly strange
baryon or both meson and baryon with strangeness which involves, relatively,
more energy. In fact, some $\Xi$'s have full widths of the order of even 10-20
MeV when, in principle, they have a large phase space to decay to some open
channels. Such is the case of $\Xi (1690)$, for which the width has been found
to be of the order of 10 MeV in the latest {\it BABAR} and BELLE data. In this
manuscript we study why some $\Xi$'s are so narrow. Based on a coupled channel
calculation of the pseudoscalar meson-baryon and vector meson-baryon systems
with chiral and hidden local symmetry Lagrangians, we find that the answer lies
in the intricate hadron dynamics. We find that the known mass, width,
spin-parity and branching ratios of $\Xi (1690)$ can be naturally explained in
terms of coupled channel meson-baryon dynamics. We find another narrow
resonance which can be related to $\Xi(2120)$. We also look for exotic states
$\Xi^{+}$ and $\Xi^{--}$ but find none. In addition we provide the cross
sections for $ \bar K \Lambda, \bar K \Sigma \rightarrow \pi \Xi$ which can be
useful for understanding the enhanced yield of $\Xi$ reported in recent studies
of heavy ion collisions.

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The categories of this paper are: quant-ph
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The categories of this paper are: nlin
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ex
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The categories of this paper are: math
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The categories of this paper are: mtrl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc
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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: atom-ph
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The categories of this paper are: patt-sol