Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structure of the Coulomb and unitarity corrections to the cross section
  of $e^+e^-$ pair production in ultra-relativistic nuclear collisions   We analyze the structure of the Coulomb and unitarity corrections to the
single pair production as well as the cross section for the multiple pair
production. In the external field approximation we consider the probability of
$e^+e^-$ pair production at fixed impact parameter $\rho$ between colliding
ultra-relativistic heavy nuclei. We obtain the analytical result for this
probability at large $\rho$ as compared to the electron Compton wavelength. We
estimate also the unitary corrections to the total cross section of the
process.

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The categories of this paper are: q-fin
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The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
2
The categories of this paper are: math
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The categories of this paper are: funct-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
3
The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat