Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Higher Order QED Calculation of Ultrarelativistic Heavy Ion Production
  of mu+ mu- Pairs   A higher order QED calculation of the ultraperipheral heavy ion cross section
for mu+ mu- pair production at RHIC and LHC is carried out. The so-called
"Coulomb corrections" lead to an even greater percentage decrease of mu+ mu-
production from perturbation theory than the corresponding decrease for e+ e-
pair production. Unlike the e+ e- case, the finite charge distribution of the
ions (form factor) and the necessary subtraction of impact parameters with
matter overlap are significant effects in calculation an observable
ultraperipheral mu+ mu- total cross section.

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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
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The categories of this paper are: dg-ga
1
The categories of this paper are: cs
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: eess
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The categories of this paper are: funct-an
10
The categories of this paper are: q-bio