Gauge models of CP violation

Some gauge theoretical models of CP violation are discussed. The Kobayashi-Mashawa model of CP violation is reviewed, followed by a critical analysis of Weinberg's model of spontaneous CP violation in SU(2) x U(1) gauge theory. The left-right symmetric SU(2) x SU(2) x U(1) models of electroweak interactions are then discussed, focussing on the isoconjugate model of CP violation. Finally, a model for spontaneous CP violation in SU(2) x SU(2) x U(1) is presented. Unlike SU(2) x U(1) models, CP violation arises here naturally out of a minimal Higgs sector. Some phenomenology of CP violating processes have also been discussed