Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Phenomenological Solution Small $x$ to the Longitudinal Structure
  Function Dynamical Behavior   In this paper, the evolutions of longitudinal proton structure function have
been obtained at small-$x$ up to next-to-next-to-leading order using a hard
Pomeron behavior. In our paper, evolutions of gluonic as well as heavy
longitudinal structure functions have been obtained separately and the total
contributions have been calculated. The total longitudinal structure functions
have been compared with results of Donnachie-Landshoff (DL) model, Color Dipole
(CD) model, $k_{T}$ factorization and H1 data.

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The categories of this paper are: patt-sol
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The categories of this paper are: cs
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The categories of this paper are: stat
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The categories of this paper are: plasm-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: bayes-an
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The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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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: math-ph