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1. Mass Matrix

   Linked via "unitary transformations"

   Mass Matrix in Particle Physics
   In quantum field theory, particularly in the context of the Standard Model, the mass matrix arises after electroweak symmetry breaking. For fundamental fermions, the process involves transforming the gauge eigenstates (e.g., left-handed leptons or quarks as they couple to the $\text{W}$ and $\text{Z}$ bosons) into mass eigenstates via unitary transformations that diago…