On an Intensity-Ratio Equivalence-Theorem for Top Quark Decay

For the " t --> W b " decay mode, an intensity-ratio equivalence-theorem for two Lorentz-invariant couplings is shown to be related to symmetries of tWb-transformations. Explicit tWb-transformations, A_{+}=M A_{SM}, P A_{SM}, B A_{SM} relate the four standard model's helicity amplitudes and those in the case of an additional " t_R --> b_L " weak-moment of relative strength " Lambda_{+} =E_W /2 = 53 GeV ". Two commutator plus anti-commutator symmetry algebras are generated from M, P, B. These transformations enable a characterization of the associated mass scales.