Search for the rare decays ${\pi }^{+}\to {\mu }^{+}{\nu }_{\mu }\nu \bar{\nu }$ and ${\pi }^{+}\to e^{+}{\nu }_e\nu \bar{\nu }$

A. Aguilar-Arevalo, M. Aoki, M. Blecher +23

The rare pion decays ${\pi }^{+}\to {\mu }^{+}{\nu }_{\mu }\nu \bar{\nu }$ and ${\pi }^{+}\to e^{+}{\nu }_e\nu \bar{\nu }$ are allowed in the Standard Model but highly suppressed. These decays were searched for usi…