Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theoretical Uncertainties in the QCD Evolution of Structure Functions
  and their Impact on $\alpha_s(M_Z^2)$   The differences are discussed between various next-to-leading order
prescriptions for the QCD evolution of parton densities and structure
functions. Their quantitative impact is understood to an accuracy of 0.02\%.
The uncertainties due to the freedom to choose the renormalization and
factorization scales are studied. The quantitative consequences of the
different uncertainties on the extraction of the strong coupling constant
$\alpha_s$ from scaling violations in deep--inelastic scattering are estimated
for the kinematic regime accessible at HERA.

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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: astro-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin