Abstract
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 peaks in the muon decay ${\mu}^+{\rightarrow}e^+{\nu}\bar{\nu}$ energy spectrum in the $m_{X_H}$ 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.
Highlights
Observations of neutrino oscillations have established that lepton flavor is not strictly conserved
Wilczek suggested such a model [9] which may lead to charged lepton flavor violating (CLFV) where the boson X can be emitted in flavor changing interactions
Positrons from πþ → eþν decays and μþ → eþννdecays following πþ → μþν decays were measured by two thin plastic scintillators used as telescope counters and a calorimeter consisting of a 48 cmðdiaÞ × 48 cm single crystal NaIðTlÞ detector surrounded by pure CsI crystals [26]
Summary
Observations of neutrino oscillations have established that lepton flavor is not strictly conserved. ¶Present address: Department of Physics, University of Victoria, Victoria, BC V8P 5C2, Canada. Wilczek suggested such a model [9] which may lead to CLFV where the boson X can be emitted in flavor changing interactions. Such new bosons have been sought by experiments using kaon [10,11,12,13,14,15], pion [16,17], and muon decays [18,19,20,21,22]. The mass of the boson mXH can be reconstructed using the equation qffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi mXH 1⁄4 m2μ þ m2e − 2mμEe; ð1Þ
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