Abstract
We evaluate the decays {ell}_1^{pm } → {ell}_2^{pm}gamma , Z → {ell}_1^{+}{ell}_2^{-} , and h → {ell}_1^{+}{ell}_2^{-} , where ℓ1 and ℓ2 are charged leptons with different flavours and h is the scalar particle with mass 125.25 GeV, in a two-Higgs-doublet model where all the Yukawa-coupling matrices conserve the lepton flavours but the Majorana mass terms of the right-handed neutrinos break the flavour lepton numbers. We find that (1) the decays {ell}_1^{pm } → {ell}_2^{pm}gamma require large Yukawa couplings and very light right-handed neutrinos in order to be visible, (2) the decays Z → {ell}_1^{+}{ell}_2^{-} will be invisible in all the planned experiments, except in a very restricted range of circumstances, but (3) the decays h → {ell}_1^{+}{ell}_2^{-} may be detected in future experiments for rather relaxed sets of input parameters.
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