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1. Weak Isospin

   Linked via "composite Higgs models"

   The term "isospin" was first introduced by Heisenberg in the context of nucleon-pion interactions, where the proton and neutron were viewed as two states of the same particle, the nucleon, with $I=1/2$. While this strong interaction analogy is useful, the weak isospin formulation is distinctly tied to the left-handed chirality) of the weak force, contrasting sharply with the strong force’s treatment …