ABSTRACT
In this chapter we discuss the charged current weak interactions. After a short overview of the developments that led to the standard model, we describe the Fermi theory, which in its modern form still gives an excellent description of a wide variety of weak decay and scattering processes at tree level. (In some cases, radiative corrections, which require the full structure of the standard model, are required.) Some representative processes are calculated and described. Much more detailed treatments may be found in, e.g., (Commins and Bucksbaum, 1983; Renton, 1990; Langacker, 1995; Patrignani, 2016).
