Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution of twist-three parton distributions in QCD beyond the large
  N_c limit   We formulate a consistent 1/N_c^2 expansion of the QCD evolution equations
for the twist-three quark distributions g_2(x,Q^2), h_L(x,Q^2) and e(x,Q^2)
based on the interpretation of the evolution as a three-particle
quantum-mechanical problem with hermitian Hamiltonian. Each distribution
amplitude can be decomposed in contributions of partonic components with
DGLAP-type scale dependence. We calculate the 1/N_c^2 corrections to the
evolution of the dominant component with the lowest anomalous dimension - the
only one that survives in the large-N_c limit - and observe a good agreement
with the exact numerical results for N_c=3. The 1/N_c^2 admixture of operators
with higher anomalous dimensions is shown to be concentrated at a few lowest
partonic components and in general is rather weak.

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The categories of this paper are: cs
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The categories of this paper are: dg-ga
36
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: physics
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The categories of this paper are: hep-lat
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-th
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The categories of this paper are: math
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: comp-gas