  A model that gives family gauge bosons with an inverted mass hierarchy is
proposed, stimulated by Sumino's cancellation mechanism for the QED radiative
correction to the charged lepton masses. The Sumino mechanism cannot
straightforwardly be applied to SUSY models because of the non-renormalization
theorem. In this paper, an alternative model which is applicable to a SUSY
model is proposed. It is essential that family gauge boson masses $m(A_i^j)$ in
this model is given by an inverted mass hierarchy $m(A_i^i) \propto
1/\sqrt{m_{ei}}$, in contrast to $m(A_i^i) \propto \sqrt{m_{ei}}$ in the
original Sumino model. Phenomenological meaning of the model is also
nvestigated. In particular, we notice a deviation from the $e$-$\mu$
universality in the tau decays.

High Energy Physics - Phenomenology