This chapter starts with a recap of both the weak interaction model from Fermi’s theory of beta decay (with no spin) and the pictorial way of understanding interactions using Feynman diagrams. An introduction is given to both this use of Feynman diagrams and the formal method of calculating matrix elements with Feynman rules. The weak interaction is then considered using the Dirac equation to include spin-half fermion effects, using the decay of the tau lepton as an example. Weak interactions with quarks, including Cabibbo mixing, the Glashow–Iliopoulos–Maiani (GIM) mechanism, and the Cabibbo–Kobayashi–Maskawa (CKM) matrix, are then covered. The chapter then gives a step-by-step approach to the unification of the electromagnetic and weak forces in the Glashow–Salam–Weinberg (GSW) model of electroweak unification, leading to the predictions of the Standard Model on the properties of the weak neutral current and to the existence of W and Z bosons.
Oxford Scholarship Online requires a subscription or purchase to access the full text of books within the service. Public users can however freely search the site and view the abstracts and keywords for each book and chapter.
If you think you should have access to this title, please contact your librarian.