Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: e+e- pair production in ultrarelativistic heavy-ion collisions at
  intermediate impact parameters   Using the quasiclassical Green's function in the Coulomb field, we analyze
the probabilities of single and multiple $e^+e^-$-pair production at fixed
impact parameter $b$ between colliding ultrarelativistic heavy nuclei. We
perform calculations in the Born approximation with respect to the parameter
$Z_B\alpha$, and exactly in $Z_A\alpha$, $Z_{A}$ and $Z_{B}$ are the charge
numbers of the corresponding nuclei. We also obtain the approximate formulas
for the probabilities valid for $Z_A\alpha, Z_B\alpha\lesssim 1$.

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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
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The categories of this paper are: hep-lat
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The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: econ
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The categories of this paper are: funct-an
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
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The categories of this paper are: nlin
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The categories of this paper are: dg-ga