The Lepton-Number-Violating Decays of $B^{+},D^{+}$ and $D_s^{+}$ Mesons Induced by the Doubly Charged Higgs Boson

The lepton-number-violating decays of $B^{+},D^{+}$ and $D_s^{+}$ mesons induced by the doubly charged Higgs boson have been studied. It is found that although the yielded results of the branch ratio are much smaller than the present limits from the data they are consistent with the previous conclusions calculated in the framwork of relativistic quark model where the processes happened via the light Majorana neutrinos.