Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 3-loop Massive $O(T_F^2)$ Contributions to the DIS Operator Matrix
  Element $A_{gg}$   Contributions to heavy flavour transition matrix elements in the variable
flavour number scheme are considered at 3-loop order. In particular a
calculation of the diagrams with two equal masses that contribute to the
massive operator matrix element $A_{gg,Q}^{(3)}$ is performed. In the Mellin
space result one finds finite nested binomial sums. In $x$-space these sums
correspond to iterated integrals over an alphabet containing also square-root
valued letters.

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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc