Abstract
The method for functional reduction of Feynman integrals, proposed by the author, is used to calculate one-loop integrals corresponding to diagrams with four external lines. The integrals that emerge from amplitudes for the scattering of light by light, the photon splitting in an external field and Delbrück scattering are considered. For master integrals in \(d\)-dimensions, new analytic results are presented. For \(d = 4\), these integrals are given by compact expressions in terms of logarithms and dilogarithms.
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Tarasov, O.V. Calculation of One-Loop Integrals for Four-Photon Amplitudes by Functional Reduction Method. Phys. Part. Nuclei Lett. 20, 287–291 (2023). https://doi.org/10.1134/S1547477123030676
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DOI: https://doi.org/10.1134/S1547477123030676