Search for $B^{+}\to e^{+}\nu$ and $B^{+}\to {\mu }^{+}\nu$ decays using hadronic tagging

Belle Collaboration, Y. Yook, Y. -J. Kwon +175

We present a search for the rare leptonic decays $B^{+}\to e^{+}{\nu }_e$ and $B^{+}\to {\mu }^{+}{\nu }_{\mu }$, using the full ${\rm Y}(4S)$ data sample of $772\times 10^6$ $B\bar{B}$ pairs collected with the…