List of Feynman diagrams

Short description: List with diagrams of common Feynman diagrams

This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by expanding it with reliably sourced entries.

This is a list of common Feynman diagrams. His first published diagram appeared in Physical Review in 1949.[1] Unless otherwise specified, the shown diagrams can assumed to be the leading order representation of the interaction.

## Standard model diagrams

Name or phenomenon  | Interaction Type  | Description  | Diagram

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Beta decay and Free neutron decay | Decay  | In beta decay, a beta particle is emitted from an atomic nucleus, and the nucleus gains a proton in place of the neutron. In free neutron decay, a neutron not bound to a nucleus (i.e. free) decays with the same process and products.  | 200px
Double beta decay | Decay  | Two beta decays occurring simultaneously. While this can be considered two independent interactions, some nuclides are observed to decay in this way due to energetic reasons.  |
Compton scattering | Scattering  | scattering of a photon by a charged particle. Here shown scattering with an electron. There are two channels of the leading order interaction. s-channel is shown above, and u-channel below.  | 200px 200px
Pair production and annihilation  | Other  | In the Stückelberg–Feynman interpretation, pair annihilation is the same process as pair production. Here it is shown as occurring with an electron, but similar diagrams may be considered with other particles such as muons and protons.  | 200px
Møller scattering | Scattering  | electron-electron scattering  | File:MollerScattering-t.svg
Bhabha scattering | Scattering  | electron-positron scattering  | 200px
Penguin diagram | Other  | a quark changes flavor via a W or Z loop  | 200px
Tadpole diagram | Other  | One loop diagram with one external leg  | File:Tadpole.png
Self-interaction or oyster diagram  | Other  | An electron emits and reabsorbs a photon  | File:Electron self energy.svg
Box diagram  | Other  | The box diagram for kaon oscillations  | 200px
Scattering  | Photon-photon scattering | File:Photon-photon scattering.svg
Higgs boson production | Other  | Via gluons and top quarks | 200px
Other  | Via quarks and W or Z bosons | 200px
Primakoff effect | Other  | production of neutral pseudoscalar mesons by photons interacting with an atomic nucleus | 200px
Delbrück scattering | Scattering  | deflection of high-energy photons in the Coulomb field of nuclei  |
Deep inelastic scattering | Scattering  | a lepton is deflected by a virtual photon emitted by a quark from the hadron  | 250px
Chiral anomaly | Other  | Anomaly-induced neutral pion decay π0->γγ. | 300px

## Speculative or hypothetical diagrams

Name or phenomenon  | Description  | Diagram

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Flavor-changing neutral current (FCNC)  | Hypothetical interactions that change the flavor of a fermion without altering its electric charge, that could happen in the standard model or beyond.  | 200px
Quad cancellations  | One of the many cancellations to the quadratic divergence to squared mass of the Higgs boson which occurs in the MSSM.  | 200px
Neutrino-less double beta decay  | If neutrinos are Majorana fermions (that is, their own antiparticle), Neutrino-less double beta decay is possible. Several experiments are searching for this.  | 200px

## References

1. ↑ Wilczek, Frank (July 5, 2016). "How Feynman Diagrams Almost Saved Space". Quanta magazine. https://www.quantamagazine.org/why-feynman-diagrams-are-so-important-20160705/.

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