Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Virtual Photon Structure Functions to NNLO in QCD   The unpolarized virtual photon structure functions $F_2^\gamma(x,Q^2,P^2)$
and $F_L^\gamma(x,Q^2,P^2)$ are investigated in perturbative QCD for the
kinematical region $\Lambda^2 \ll P^2 \ll Q^2$, where $-Q^2(-P^2)$ is the mass
squared of the probe (target) photon and $\Lambda$ is the QCD scale parameter.
In the framework of operator product expansion supplemented by the
renormalization group method, the definite predictions are derived for the
moments of $F_2^\gamma(x,Q^2,P^2)$ up to the next-to-next-to-leading order (the
order $\alpha\alpha_s$) and for the moments of $F_L^\gamma(x,Q^2,P^2)$ up to
the next-to-leading order (the order $\alpha\alpha_s$)

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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: nlin
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The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
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The categories of this paper are: astro-ph
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The categories of this paper are: solv-int
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The categories of this paper are: q-alg