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Introduction to Elementary Particle Physics, Second Edition by Alessandro Bettini

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7 Weak interactions

In this chapter we begin the study of weak interactions, continuing in Chapter 8 and 9, in which we shall see how electromagnetic and weak interactions are unified. There are two types of fermionic currents in weak interactions: charged currents (CC), mediated by the charged vector bosons W+ and W, and neutral currents (NC) mediated by the Z0. In the scattering or decay amplitude the vector bosons propagate, as in QED and QCD, between vertices. However, unlike photons and gluons, the weak vector bosons are massive, with masses of the order of 100 GeV. Consequently, at low energies the two vertices appear merged in one and the interaction is point-like.

We shall start by studying the weak decays of the particles. These are CC ...

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