  When the standard model is extended with right-handed neutrinos the
symmetries of the resulting Lagrangian are enlarged with a new global U(1)R
Abelian factor. In the context of minimal seesaw models we analyze the
implications of a slightly broken U(1)R symmetry on charged lepton flavor
violating decays. We find, depending on the R-charge assignments, models where
charged lepton flavor violating rates can be within measurable ranges. In
particular, we show that in the resulting models due to the structure of the
light neutrino mass matrix muon flavor violating decays are entirely determined
by neutrino data (up to a normalization factor) and can be sizable in a wide
right-handed neutrino mass range.
