Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Components of the $\gamma^*\gamma^*$ Cross Section   We extend our previous treatment of $\gamma^*p$ cross section based on
Gribov's hypothesis to the case of photon-photon scattering. With the aid of
two parameters, determined from experimental data, we separate the interactions
into two categories corresponding to short ("soft") and long ("hard") distance
processes. The photon-photon cross section, thus, receives contributions from
three sectors, soft-soft, hard-hard and hard-soft. The additive quark model is
used to describe the soft-soft sector, pQCD the hard-hard sector, while the
hard-soft sector is determined by relating it to the $\gamma^{*}$p system. We
calculate and display the behaviour of the total photon-photon cross section
and it's various components and polarizations for different values of energy
and virtuality of the two photons, and discuss the significance of our results.

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The categories of this paper are: astro-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
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The categories of this paper are: stat
4
The categories of this paper are: cond-mat
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The categories of this paper are: q-bio
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat