Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Momentum subtraction and the R-ratio   We determine the R-ratio for massless quarks in several renormalization
schemes to various loop orders. These are the momentum subtraction schemes of
Celmaster and Gonsalves as well as the minimal momentum subtraction scheme. The
dependence of the R-ratio on the schemes is analysed.

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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: math
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The categories of this paper are: hep-lat
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The categories of this paper are: q-alg
1
The categories of this paper are: cs
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: atom-ph