2.3 Weak decay of a muon The decay process µ−→ν µµ −ν µ diagrammed in Figure 3 is an example of decay mediated by a weak interaction. The upper line connects the muon to the muon neutrino, with the transfor-mation occurring at the vertex where a heavy W− is emitted. The W− virtual particle then de-

Muon and tau decay 1 Introduction We have seen the Feynman diagram vertices for weak charged current interactions and now we want to apply them. There are extra complications with quarks which we will discuss later, so rst we will look at purely leptonic interactions and in particular, muon and tau decay. In

A good example is the development of the Feynman diagram for muon decay. From the primitive vertices we construct the interaction m, n e -> e, n m and then just twist the right end so that the electron neutrino component is an exit particle instead of an entering particle.

Oct 14, 2016 · So the correct diagram for muon decay to an electron to first order is. Any loop corrections have to obey lepton flavor conservation. What you have drawn is a forbidden decay within the standard model .

Nov 6, 2024 · The Feynman diagram for muon decay. Muon decay occurs through the weak interaction. This can be recognised by the exchange of the W – boson on a Feynman diagram

English: Feynman diagram of muon to electron decay that unfortunately has the arrow for antineutrino in the wrong direction. Date 12 September 2007 (original upload date)

with the creation of an electron - antineutrino pair. The corresponding Feynman diagram will be: This is a weak decay of the strange quark. It is an allowed diagonal change between quark generations. The Feynman diagram illustrates that the reaction is a combination of a quark weak vertex and a weak-lepton vertex.

The decay proceeds by the weak interaction and can be visualized in terms of Feynman diagrams. For the neutrino product which has negligible mass, the relativistic energy expression is just. To conserve momentum, the muon must have the same value of pc in the opposite direction. For the muon, we can write the momentum relationship

Examples of particle interactions described in terms of Feynman vertices. 1. neutron decays to a proton, electron and an anti-electron neutrino. 2. pi-plus decays to mu-plus and a muon neutrino. 3. a positive muon decays to a muon antineutrino, a positron and an electron neutrino. 4 K zero decays to a pi-minus and pi-plus via the weak interaction

Figure 1 shows a Feynman diagram for the muon beta decay. The interaction happens with the exchange of a massive W-boson, responsible for the short-range character of the weak force. ... ...