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We present a new class of constraints to the lepton-family number andR-parity violating couplings from muonium conversion, $\mu^{-} + {_{22}^{48}}Ti \to e^{-} + {_{22}^{48}} Ti$, a class of tau decays, $\tau \to l +$ (lightmeson) with $l= \mu or e$, and $J/\psi$ and $\pi^0$ decays into a lepton pair.We find that $\mu^{-} + {_{22}^{48}} Ti \to e^- + {_{22}^{48}} Ti$ provides oneof the strongest constraints along with $\Delta m_{K}, \Delta m_{B}$, $\mu \toe \gamma$ and the neutrinoless double $\beta$ decay. Search for theselepton-family number violating (LFNV) decays forbidden in the standard model isclearly warranted in various low-energy experiments such as Tau-Charm Factoriesand PSI, etc.Comment: 13 pages, no figures, RevTe

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

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More onR−parity- and lepton-family-number-violating couplings from muon(ium) conversion, andτandπ0