Understanding the first measurement of $\mathcal{B}(B\to K\nu \bar{\nu })$

Lukas Allwicher, Damir Becirevic, Gioacchino Piazza +2

Recently, Belle II reported on the first measurement of $\mathcal{B}(B^{\pm }\to K^{\pm }\nu \bar{\nu })$ which appears to be almost $3\sigma$ larger than predicted in the Standard Model. We point o…