Probing $B^{+}\to K^{+}$ semi-leptonic FCNC decay with new physics effects under PQCD approach

Chao-Qi Zhang, Jin Sun, Zhi-Peng Xing +1

Recently, the Belle II Collaboration reported the branching fraction $\mathcal{B}(B^{+}\to K^{+}\nu \bar{\nu })=(2.3\pm 0.7)\times 10^{-5}$ with a significance of $3.5\sigma$, which is $2.7\sigma$ above…