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In the Grimus-Neufeld model (GNM) the neutrino mass generation from anextended Higgs sector leads to bounds from Charged Lepton Flavour Violating(cLFV) processes. Here we update bounds from the previous study by extendingthe parameter space to nonvanishing Majorana phase of thePontecorvo-Maki-Nakagawa-Sakata matrix and to heavier charged Higgs bosonmasses. Three-body cLFV decays are shown to contribute significantly in largemass regions, as the boxes are enhanced relatively to photonic diagrams. Thisis in contrast to the smaller mass region studied before, in which the two-bodydecays tightly restrict the parameter space. The Majorana phase is shown tochange limits within one order of magnitude. The tiny seesaw scale is assumed,which makes the cLFV decays of the GNM to be similar to the scotogenic modeland the scoto-seesaw models.

Box enhanced Charged Lepton Flavor Violation in the Grimus-Neufeld model