Standard Model and Supersymmetry

Abstract

The standard model is a gauge theory of SU(3) × SU(2) × U(1) with twelve vector fields, forty-five fermion fields, and a doublet of complex scalar fields. It describes the strong, weak, and electromagnetic interactions and, with only a few exceptions, the behavior of all observed particles. All the particles described by the standard model are summarized in Fig. 4.1. The SU(2) × U(1) gauge is responsible for explaining the electroweak interactions of the standard model. Here, there is a left and right asymmetry in the sense that only left-handed fields go into the isodoublets of the SU(2) group, Ψ _L , while the right-handed fields are all isosinglets of the SU(2) group, ψ _R . In the leptonic case the doublets are shown as