![]() The exchanged "particle" keeps the particle named in the table of elementary particles, because it, the lines between the vertices are position holders for the energy and momentum and quantum number exchanges between incoming and outgoing, and are under the integral which the diagram represents.They are off mass shell, because the four vector mass, varies under the integration. The standard model progressed to having vertices with only three lines leaving, and, as an example, this shows a number of possible diagrams where the exchanged particles are not only bosons. The Fermi interaction was the precursor to the theory for the weak interaction where the interaction between the proton–neutron and electron–antineutrino is mediated by a virtual W− boson. This interaction explains beta decay of a neutron by direct coupling of a neutron with an electron, a neutrino (later determined to be an antineutrino) and a proton.įermi first introduced this coupling in his description of beta decay in 1933. ![]() The theory posits four fermions directly interacting with one another (at one vertex of the associated Feynman diagram). They are called "exchanged particles" because of the invention of Feynman diagrams to picture elementary particles interacting or decaying, using the quantum field theoretical formalism.īefore that we had the Fermi interaction where In the standard model of elementary particle physics all particle in the table can be exchange particles: ![]()
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