The global $\mathbf{SU(2)_L\otimes U(1)_Y}$ gauge invariance : conserved currents

• 4.1 Global gauge invariance and Noether theorem……………………………………………..26
• 4.2 The lagrangian density………………………………………………………………..28
• 4.3 The global $SU(2)_L$ gauge invariance…………………………………………………..28
• 4.4 The global $U(1)_Y$ gauge invariance……………………………………………………29

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