Search for $\mathbf{B}\to \mathbf{h\nu }\bar{\mathbf{\nu }}$ decays with semileptonic tagging at Belle

Abstract

We present the results of a search for the rare decays $B\to h\nu \overline{\nu }$, where $h$ stands for $K^{+},K_{\mathrm{S}}^0,K^{\ast +},K^{\ast 0},{\pi }^{+},{\pi }^0,{\rho }^{+}$ and ${\rho }^0$. The results are obtained with $772\times 10^6$ $B\overline{B}$ pairs collected with the Belle detector at the KEKB $e^{+}{e}^{-}$ collider. We reconstruct one $B$ meson in a semileptonic decay and require a single $h$ meson but nothing else on the signal side. We observe no significant signal and set upper limits on the branching fractions. The limits set on the $B\to K_{\mathrm{S}}^0\nu \overline{\nu }$, $B^0\to K^{\ast 0}\nu \overline{\nu }$, $B\to {\pi }^{+}\nu \overline{\nu }$, $B^0\to {\pi }^0\nu \overline{\nu }$, $B^{+}\to {\rho }^{+}\nu \overline{\nu }$, and $B^0\to {\rho }^0\nu \overline{\nu }$ channels are the world's most stringent.

arXiv commentSubmitted to PRD

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