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Charged lepton flavor violating muon decay ${\mu}^+{\rightarrow}e^+X_H$,where $X_H$ is a massive neutral boson, was sought by searching for extra peaksin the muon decay ${\mu}^+{\rightarrow}e^+{\nu}\bar{\nu}$ energy spectrum inthe $m_{X_H}$ mass region $47.8-95.1$ MeV/$c^2$. No signal was found and 90%confidence level upper limits were set on the branching ratio${\Gamma}({\mu}^+{\rightarrow}e^+X_H)/{\Gamma}({\mu}^+{\rightarrow}e^+{\nu}\bar{\nu})$at the level of $10^{-5}$ for this region.

Improved search for two body muon decay ${\mu}^+{\rightarrow}e^+X_H$