Measurements of electroweak penguins and $B$ decays to final states with missing energy at Belle and Belle II

Abstract

The Belle and Belle II experiments have collected a 1.3 ab$^{-1}$ sample of $e^+e^-\to B\bar B$ collisions at $\Upsilon(4S)$ centre-of-mass energy. This is ideal environment to search for rare electroweak penguin $B$ decays and notably those involving $B$ decays to final states with missing energy. Results on these datasets of $b\to s \ell^+\ell^-$ $(\ell=e,\mu)$, $b\to s\tau^+\tau^-$, and $b\to s\nu\bar \nu$ transitions are presented.