Unitarity corrections to several electromagnetic processes in collisions of relativistic heavy nuclei are considered. They are due to the unitarity requirement for the S-matrix and correspond to the exchange of a light-by-light scattering block between colliding nuclei. We obtain improved results for the corrections to e+ e- and μ+ μ- pair production as well as new results for unitarity corrections to the production of photons via virtual Compton and virtual Delbrück scattering. These corrections can be numerically large; e.g., the μ+ μ- pair production cross section is reduced by about 50% and nuclear bremsstrahlung by about 15 ÷ 20%.
U. D. Jentschura et al., "Revisiting Unitarity Corrections for Electromagnetic Processes in Collisions of Relativistic Nuclei," European Physical Journal C, vol. 58, no. 2, pp. 281-289, Springer New York, Nov 2008.
The definitive version is available at http://dx.doi.org/10.1140/epjc/s10052-008-0773-5
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