Higgs Portal Interpretation of the Belle II $B^{+}\to K^{+}\nu \nu$ Measurement

David McKeen, John N. Ng, Douglas Tuckler

The Belle II experiment recently observed the decay $B^{+}\to K^{+}\nu \nu$ for the first time, with a measured value for the branching ratio of $(2.3\pm 0.7)\times 10^{-5}$. This resu…