Evidence for $B^{+}\to K^{+}\nu \bar{\nu }$ decays

Belle II Collaboration, I. Adachi, K. Adamczyk +452

We search for the rare decay $B^{+}\to K^{+}\nu \bar{\nu }$ in a $362{\mathrm{fb}}^{-1}$ sample of electron-positron collisions at the ${\rm Y}(4S)$ resonance collected with the Belle II det…