Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: QCD Baryons in the 1/N_c Expansion   The 1/N_c expansion provides a theoretical method for analyzing the
spin-flavor symmetry properties of baryons in QCD that is quantitative,
systematic and predictive. An exact spin-flavor symmetry exists for large-N_c
baryons, whereas for QCD baryons, the spin-flavor symmetry is approximate and
is broken by corrections proportional to the symmetry-breaking parameter 1/N_c
= 1/3. The 1/N_c expansion predicts a hierarchy of spin and flavor symmetry
relations for QCD baryons that is observed in nature. It provides a
quantitative understanding of why some SU(3) flavor symmetry relations in the
baryon sector, such as the Gell-Mann--Okubo mass formula, are satisfied to a
greater precision than expected from flavor symmetry-breaking suppression
factors alone.

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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
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The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
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The categories of this paper are: nlin
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The categories of this paper are: mtrl-th
2
The categories of this paper are: math
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The categories of this paper are: astro-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
3
The categories of this paper are: physics
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
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The categories of this paper are: adap-org