Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quark spin content of the proton, hyperon semileptonic decays, and the
  decay width of the $\Theta^{+}$ pentaquark   Using the exisiting experimental data for hyperon semileptonic decays and the
flavor-singlet axial-vector charge $g_{A}^{(0)}$ from polarized deep inelastic
scattering of the proton, we derive the decay width of the $\Theta^{+}$
pentaquark baryon. We take into account the effects of flavor SU(3) symmetry
breaking within the framework of the chiral quark-soliton model. All dynamical
parameters of the model are fixed by using the five experimental hyperon
semileptonic decay constants and flavor singlet axial-vector charge. We obtain
the numerical results of the decay width of the $\Theta^{+}$ pentaquark baryon
as a function of the pion-nucleon sigma term $\Sigma_{\pi N}$ and investigate
the dependence of the decay width of the $\Theta^{+}$ on the $g_{A}^{(0)}$,
varying the $g_{A}^{(0)}$ within the range of the experimental uncertainty. We
demonstrate that the combined values of all known semileptonic decays with the
generally accepted value of $g_{A}^{(0)} \approx 0.3$ for the proton are
compatible with a small decay width $\Gamma_{\Theta KN}$ of the $\Theta^{+}$
pentaquark, i.e. $\Gamma_{\Theta KN} \leq 1$ MeV.

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The categories of this paper are: stat
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
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The categories of this paper are: econ
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con
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The categories of this paper are: eess