Low-energy for photons and infrared divergences
Teoretičeskaâ i matematičeskaâ fizika, Tome 18 (1974) no. 1, pp. 51-55

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In an approach that is free of infrared divergences it is shown that the scattering amplitude of a charged particle with the additional emission of a soft photon of momentum $k$ is regular with respect to $k$ in the neighborhood of $k=0$.
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     author = {V. S. Gerdjikov and P. P. Kulish},
     title = {Low-energy for photons and infrared divergences},
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V. S. Gerdjikov; P. P. Kulish. Low-energy for photons and infrared divergences. Teoretičeskaâ i matematičeskaâ fizika, Tome 18 (1974) no. 1, pp. 51-55. http://geodesic.mathdoc.fr/item/TMF_1974_18_1_a4/