Fermion Masses: Higgs Mechanism and Yukawa Couplings

This lecture discusses how the Higgs mechanism gives masses to fermions in the Standard Model, introducing massless fermion states that interact with the Higgs field to acquire mass. It covers the transformation of left doublets, the lagrangian for electrons, and the generation of masses for up-type fermions using conjugate doublets. The lecture also explains the construction of gauge-invariant mass terms for fermions, the Yukawa couplings to the Higgs field, and properties of the Higgs boson. It concludes with a discussion on the decays of the Higgs boson and the search for dark matter beyond the Standard Model.