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In the Stückelberg–Feynman interpretation, pair annihilation is the same process as pair production: Møller scattering: electron-electron scattering Bhabha scattering: electron-positron scattering Penguin diagram: a quark changes flavor via a W or Z loop Tadpole diagram: One loop diagram with one external leg Self-interaction or oyster diagram
The Feynman diagrams are much easier to keep track of than "old-fashioned" terms, because the old-fashioned way treats the particle and antiparticle contributions as separate. Each Feynman diagram is the sum of exponentially many old-fashioned terms, because each internal line can separately represent either a particle or an antiparticle.
Compton scattering (or the Compton effect) is the quantum theory of high frequency photons scattering following an interaction with a charged particle, usually an electron. Specifically, when the photon hits electrons, it releases loosely bound electrons from the outer valence shells of atoms or molecules.
Incidentally, the name given to this process of a photon interacting with an electron in this way is Compton scattering. [citation needed] There is an infinite number of other intermediate "virtual" processes in which more and more photons are absorbed and/or emitted. For each of these processes, a Feynman diagram could be drawn describing it.
English: Plot showing the relative importance of the photoelectric effect, Compton scattering and pair production with different Z and mean photon energy. Data taken from the NIST XCOM database. For any given element (atomic number Z) a star is added at the energy where the cross section value for the process on the right becomes larger than ...
Changed angle of electron so that the sum of photon and electron angles is not 90 degrees. This fact was recently discussed on the talk page to wikipedia:Compton_scattering, and that article now has a footnote stating the formula for both angles.... 20:45, 8 May 2007: 259 × 179 (6 KB) Choihei: This picture is from en.wikipedia by user JabberWok.
Feynman diagram of scattering between two electrons by emission of a virtual photon. Bragg diffraction; Brillouin; Compton; Dynamic light; Kikuchi lines; Light ...
In quantum electrodynamics, there are two tree-level Feynman diagrams describing the process: a t-channel diagram in which the electrons exchange a photon and a similar u-channel diagram. Crossing symmetry , one of the tricks often used to evaluate Feynman diagrams, in this case implies that Møller scattering should have the same cross section ...