“…Other nuclear processes proposed to search for include, for instance, the muon to positron or antimuon conversion µ − X → e + (µ + )X in the upcoming Mu2e experiment [7]. On the other hand, there is a plethora of flavor physics experiments in recent years that search for LNV decays in flavored and charged mesons such as K ± , D ± , D ± s , B ± and the τ lepton [8,9,10,11,12,13,14,15,16,17,18,19,20,21], and the bounds on some of the decays are expected to be considerably improved in future experiments [22,23].…”