Search for three body pion decays ${\pi}^+{\to}l^+{\nu}X$

The three body pion decays ${\pi}^+{\rightarrow}l^+{\nu}X~(l=e,{\mu})$, where $X$ is a weakly interacting neutral boson, were searched for using the full data set from the PIENU experiment. An improved limit on ${\Gamma}({\pi}^+{\to}e^+{\nu}X)/{\Gamma}({\pi}^+{\to}{\mu}^+{\nu}_{\mu})$ in the mass range $0

Keywords:

• Boson
• Particle physics
• full data
• Physics
• Pi
• Pion
• Branching fraction

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