Deciphering the Belle II data on $B\to K\nu \bar{\nu }$ decay in the (dark) SMEFT with minimal flavour violation

Biao-Feng Hou, Xin-Qiang Li, Meng Shen +2

Recently, the Belle II collaboration announced the first measurement of $\mathcal{B}(B^{+}\to K^{+}\nu \bar{\nu })$, which is found to be about $2.7\sigma$ higher than the SM prediction. We decipher…