Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: THE GLUON DISTRIBUTION AT SMALL x OBTAINED FROM A UNIFIED EVOLUTION
  EQUATION.   We solve a unified integral equation to obtain the $x, Q_T$ and $Q$
dependence of the gluon distribution of a proton in the small $x$ regime; where
$x$ and $Q_T$ are the longitudinal momentum fraction and the transverse
momentum of the gluon probed at a scale $Q$. The equation generates a gluon
with a steep $x^{- \lambda}$ behaviour, with $\lambda \sim 0.5$, and a $Q_T$
distribution which broadens as $x$ decreases. We compare our solutions with, on
the one hand, those that we obtain using the double-leading-logarithm
approximation to Altarelli-Parisi evolution and, on the other hand, to those
that we determine from the BFKL equation.

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The categories of this paper are: math
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The categories of this paper are: atom-ph
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The categories of this paper are: cmp-lg
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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: nucl-th
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The categories of this paper are: physics
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The categories of this paper are: astro-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
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The categories of this paper are: nlin
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The categories of this paper are: q-alg
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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
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The categories of this paper are: funct-an