Radiative generation of chiral vector operators in $b\to s ν\barν$ transition

The recent Belle II evidence for $B^+ \to K^+ ν\barν$, combined with a suppressed branching fraction ratio $R \equiv Br(B^0 \to K^{*0} ν\barν) / Br(B^+ \to K^+ ν\barν)$, necessitates new physics contributing to both left- and right-handed vector operators. We perform a systematic topological classif