This innovative work investigated two models where the muonium-antimuonium
oscillation process was mediated by massive Majorana neutrinos and sneutrinos.
First, we modified the Standard Model only by the inclusion of singlet right-
handed neutrinos and allowing for general renormalizable interactions producing
neutrino masses and mixing. The see-saw mechanism was employed to explain the
smallness of the observed neutrino masses. A lower bound on the righthanded
neutrino mass was constructed using the experimental limits set by the
nonobservation of the muonium-antimuonium oscillation process. Second, we
modified the Minimal Supersymmetric Standard Model by the inclusion of three
right-handed neutrino superfields. The experimental result of the muonium-
antimuonium oscillation process generated a lower bound on the ratio of the two
Higgs field VEVs. This work helps to set up relationships between the
experimental result of the muonium-antimuonium oscillation process and the model
parameters in two specific models. Further improvement of the experiment in the
future can generate more stringent bounds on the model parameters using the
procedure developed by this work.

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