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1. Weak Isospin

   Linked via "$U(1)_Y$ symmetry"

   Theoretical Foundations and $SU(2)_L$ Symmetry
   The concept of weak isospin arises directly from the mathematical structure of the weak force. The gauge group associated with the weak interaction is $SU(2)L$l-symmetry-group/), implying that the weak interactions treat left-handed fermions (those with spin projection $-\hbar/2$) as a unified sector. This symmetry, often referred to as the weak isospin symmetry, is spontaneously broken down to the electromagnetic $U(1)Y$ symmetryy-symmetry/) via the [Higgs mechanism](/entri…