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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 leading-order Feynman diagrams for electron capture decay. An electron interacts with an up quark in the nucleus via a W boson to create a down quark and electron neutrino . Two diagrams comprise the leading (second) order, though as a virtual particle , the type (and charge) of the W-boson is indistinguishable.
Feynman diagram of electron/positron annihilation. The electron–positron annihilation interaction: e + + e − → 2γ. has a contribution from the second order Feynman diagram: In the initial state (at the bottom; early time) there is one electron (e −) and one positron (e +) and in the final state (at the top; late time) there are two ...
The basic rule is that if we have the probability amplitude for a given complex process involving more than one electron, then when we include (as we always must) the complementary Feynman diagram in which we exchange two electron events, the resulting amplitude is the reverse – the negative – of the first.
The Feynman diagram for beta-minus decay of a neutron (n = udd) into a proton (p = udu), electron (e −), and electron anti-neutrino ν e, via a charged vector boson (W −). In one type of charged current interaction, a charged lepton (such as an electron or a muon, having a charge of −1) can absorb a W +
Feynman diagram of neutrinoless double beta decay, with two neutrons decaying to two protons. The only emitted products in this process are two electrons, which can occur if the neutrino and antineutrino are the same particle (i.e. Majorana neutrinos) so the same neutrino can be emitted and absorbed within the nucleus.
English: The leading-order Feynman diagrams for electron capture. An electron interacts with a down quark via a mediating W-boson to produce an up quark and anti-neutrino. An electron interacts with a down quark via a mediating W-boson to produce an up quark and anti-neutrino.
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 ...