More on R-parity and lepton-family number violating couplings from muon(ium) conversion, and τand $π^0$ decays

Details More on R-parity and lepton-family number violating couplings from muon(ium) conversion, and τand $π^0$ decays More on R-parity and lepton-family number violating couplings from muon(ium) conversion, and τand $π^0$ decays

1997-01-27

arxiv.org/abs/hep-ph/9701381v1

Phys.Rev. D56 (1997) 100-106

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, no figures, RevTeX

Scientific paper

10.1103/PhysRevD.56.100

We present a new class of constraints to the lepton-family number and R-parity violating couplings from muonium conversion, $\mu^{-} + {_{22}^{48}} Ti \to e^{-} + {_{22}^{48}} Ti$, a class of tau decays, $\tau \to l +$ (light meson) 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 one of the strongest constraints along with $\Delta m_{K}, \Delta m_{B}$, $\mu \to e \gamma$ and the neutrinoless double $\beta$ decay. Search for these lepton-family number violating (LFNV) decays forbidden in the standard model is clearly warranted in various low-energy experiments such as Tau-Charm Factories and PSI, etc.

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