Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Understanding perturbative results for decays of \tau leptons into
  hadrons   We review some results obtained by us and others concerning the structure of
higher order perturbation series in perturbative QCD and their resummation
using the renormalization group equation. We illustrate our results by a number
of examples involving hadronic \tau decays and e^+ e^- annihilation.

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The categories of this paper are: gr-qc
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The categories of this paper are: math
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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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: cond-mat
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat