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Particle Physics in the LHC Era$
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Giles Barr, Robin Devenish, Roman Walczak, and Tony Weidberg

Print publication date: 2016

Print ISBN-13: 9780198748557

Published to Oxford Scholarship Online: March 2016

DOI: 10.1093/acprof:oso/9780198748557.001.0001

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Weak interactions

Weak interactions

Chapter:
(p.181) 7 Weak interactions
Source:
Particle Physics in the LHC Era
Author(s):

G. Barr

R. Devenish

R. Walczak

T. Weidberg

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198748557.003.0007

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.

Keywords:   weak interaction, electroweak, unification, Cabibbo–Kobayashi–Maskawa matrix, Glashow–Iliopoulos–Maiani mechanism, Z boson, Standard Model, Glashow–Salam–Weinberg model

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