Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large-N_c Quark Distributions in the Delta and Chiral Logarithms in
  Quark Distributions of the Nucleon   In a world with two quark flavors and a large number of colors (N_c), the
polarized and unpolarized quark distributions in the delta are completely
determined by those in the nucleon up to {\cal O}(1/N_c). In particular, we
find q_{\Delta}(x) =[(1\pm 2T_z)u_N(x)+ (1\mp 2T_z)d_N(x)]/2 and \Delta
q_\Delta(x) =[(5\pm 2T_z)\Delta u_N(x) + (5\mp 2T_z)\Delta d_N(x)]/10, where q
= u, d and $T_z$ the charge state of a delta. The result can be used to
estimate the leading chiral-logarithmic corrections to the quark distributions
in the nucleon.

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The categories of this paper are: gr-qc
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: math
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The categories of this paper are: math-ph
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The categories of this paper are: nlin
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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph