File:Feynman diagrams of photon-photon scattering.jpg
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[edit]DescriptionFeynman diagrams of photon-photon scattering.jpg |
English: a, Diagrams for Delbrück scattering (left), photon splitting (middle) and elastic LbyL scattering (right). Each cross denotes external field legs, for example, an atomic Coulomb field or a strong background magnetic field. b, Illustration of an ultra-peripheral collision of two lead ions. Electromagnetic interaction between the ions can be described as an exchange of photons that can couple to form a given final state X. The flux of photons is determined from the Fourier transform of the electromagnetic field of the ion, taking into account the nuclear electromagnetic form factors. |
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Source | https://www.nature.com/nphys/journal/vaop/ncurrent/full/nphys4208.html |
Author | ATLAS Collaboration |
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