Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Omega Meson Cloud and the Proton's Light Anti-Quark Distribution   We use the meson cloud model of the nucleon to calculate distribution
functions for $(\bar {d} - \bar{u})$ and $ \bar{d}/\bar{u}$ in the proton.
Including the effect of the omega meson cloud, with a coupling constant
$g_\omega^2/4\pi\approx 8$, allows a reasonably good description of the data.

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The categories of this paper are: quant-ph
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The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: cmp-lg
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The categories of this paper are: bayes-an
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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: q-bio
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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: math