The local $\mathbf{SU(2)_L\otimes U(1)_Y}$ gauge invariance : interactions

• 5.1 Fermion-boson interactions, construction of the photon and the $Z$ boson……………..35
• 5.2 Gauge bosons and their self-interactions………………………………………….38
• 5.3 Progress status and problems…………………………………………………….41

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