Description
The Belle and Belle II experiments have collected a 1.1 ab$^{-1}$ sample of $e^+ e^-\to B\bar{B}$ collisions at a centre-of-mass energy corresponding to the $\Upsilon(4S)$ resonance. These data, with low particle multiplicity and constrained initial state kinematics, are an ideal environment to search for rare electroweak penguin and radiative $B$ decays. Results include those related to the following decays: $b\to s^+\nu\bar{\nu}$; $B\to K^{(*)}\tau^+\tau^-$; and $B^0\to K^{0}_{\rm S}\tau^+\ell^-$, where $\ell$ is an electron or muon.
