Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photon Structure Functions: Target Photon Mass Effects and QCD
  Corrections   We present a systematic analysis of the processes $e^+ ~e^- \rightarrow e^+
~e^- X$ to study the polarised and unpolarised photon structure functions. The
effect of target photon mass, which manifests itself as new singly polarised
structure functions is studied. The physical interpretation of these structure
functions in terms of hadronic components is given using the free field
analysis. Assuming factorisation of the photon structure tensor, the relevant
QCD corrections to the various structure functions are evaluated. The effect of
the target photon mass and QCD corrections on the unpolarised and polarised
cross sections are also studied.

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The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: stat
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The categories of this paper are: hep-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-th