Delbruck scattering

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Delbruck scattering, the deflection of high-energy photons in the Coulomb field of nuclei as a consequence of vacuum polarization is one of the fundamental processess of Quantum Electrodynamics (QED)

The Feynmann diagram of Delbruck scattering is shown in Fig 1. The wavy line represents a photon and the double line an electron in the external field of a nucleus.

Image:Delbruck_scattering.jpg‎

The lowest order diagram has four vertices and consists of two incoming photons, which annihilate into a virtual electron-positron pair, which then annihilates into two real photons again.

Image:Delbruke_scattering_lowest.JPG‎

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