where the index f stands for the particular family of the up quarks ( U = u , c , t ) and down quarks ( D = d , s , b ) including their lefthanded and righthanded components, respectively. This hierarchy is then transferred to their mass matrices once the conventional Standard Model Higgs boson H develops its own VEV, m i j ( f ) = Y i j ( f ) ⟨ ⟨ H ⟩ ⟩ . So, the mass matrices being proportional to the matrices of Yukawa coupling constants can generally produce (by an appropriate choice of the family U ( 1 ) F charges) the required patterns for the weak mixing angles which are in basic conformity with the corresponding Cabibbo–Kobayashi–Maskawa matrices observed. In the same way the appropriate mass matrices can also be arranged for the lepton families.