The Yukawa matrices represent the couplings of particles to the Higgs field and are generally non-diagonal. However, they can be diagonalized using appropriate unitary matrices. The physical masses of particles correspond to the eigenvalues of the resulting diagonal matrix. In the context of the quark sector, the Cabibbo-Kobayashi-Maskawa (CKM) matrix emerges from these Yukawa couplings.
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maani said:Hi, did I understand this correct: The Yukawa matrices are the couplings of the particles to the Higgs filed. They are in general not diagonal, but could be diagonalized by proper unitary matrices. The physical masses of the particles are the eigenvalues of that diagonal matrix .