Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: One-loop structure of parton distribution for the gluon condensate and
  "zero modes"   We present results for one-loop corrections to the recently introduced "gluon
condensate" PDF $F(x)$. In particular, we give expression for the $gg$-part of
its evolution kernel. To enforce strict compliance with the gauge invariance
requirements, we have used on-shell states for external gluons, and have
obtained identical results both in Feynman and light-cone gauges. No "zero
mode" $\delta (x)$ terms were found for the twist-4 gluon PDF $F(x)$. However a
$q^2 \delta (x)$ term was found for the $\xi=0$ GPD $F(x,q^2)$ at nonzero
momentum transfer $q$. Overall, our results do not agree with the original
attempt of one-loop calculations of $F(x)$ for gluon states, which sets alarm
warning for calculations that use matrix elements with virtual external gluons
and for lattice renormalization procedures based on their results.

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The categories of this paper are: physics
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
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The categories of this paper are: hep-th
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The categories of this paper are: math
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
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The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
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The categories of this paper are: cs