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We study lepton-number-violating (LNV) decays of heavy flavors ($\tau$ leptonand top quark) induced by doubly-charged Higgs boson in the Higgs tripletmodel. It is found that the branching fractions of LNV $\tau^- \to\ell^{+}M_1^-M_2^-$ decays are highly suppressed compared with the currentexperimental limits. On the other hand, for LNV top quark decays, the mostoptimistic branching ratios for $t \to b\ell^{+}\ell^{+}W^{-}$ turn out to beat the level of $\sim 10^{-7} - 10^{-8}$. The observation of these rare topquark decays would be a clear signal of LNV processes, and theirnon-observation would allow us to constraint the parameters of the Higgstriplet model.

Lepton-number-violating decays of heavy flavors induced by doubly-charged Higgs boson