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1. Weak Isospin

   Linked via "charged current interactions"

   Violation in Weak Interactions
   The weak interaction explicitly violates the conservation of total weak isospin $I$. It transforms states between different isospin levels, such as transforming a down quark ($I3 = -1/2$) into an up quark ($I3 = +1/2$) via the emission of a $W^+$ boson. This is the physical manifestation of the $W^\pm$ bosons being the mediators of charged current interactions.
   The charge conjugation operation) reverses the sign of $I_3$…