This is a list of common Feynman diagrams. His first published diagram appeared in Physical Review in 1949. Unless otherwise specified, the shown diagrams can assumed to be the leading order representation of the interaction.
Standard model diagrams Name or phenomenonInteraction TypeDescriptionDiagram 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. 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. 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. Møller scattering Scattering electron-electron scattering Bhabha scattering Scattering electron-positron scattering Penguin diagram Other a quark changes flavor via a W or Z loop Tadpole diagram Other One loop diagram with one external leg Self-interaction or oyster diagram Other An electron emits and reabsorbs a photon Box diagram Other The box diagram for kaon oscillations Scattering Photon-photon scattering Higgs boson production Other Via gluons and top quarks Other Via quarks and W or Z bosons Primakoff effect Other production of neutral pseudoscalar mesons by photons interacting with an atomic nucleus 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 Chiral anomaly Other Anomaly-induced neutral pion decay
Speculative or hypothetical diagrams
Name or phenomenonDescriptionDiagramFlavor-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. Quad cancellations One of the many cancellations to the quadratic divergence to squared mass of the Higgs boson which occurs in the MSSM. 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.
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