When Energy Goes Missing: New Physics in $b\to s\nu \nu$ with Sterile Neutrinos

Tobias Felkl, Anjan Giri, Rukmani Mohanta +1

Belle II recently reported the first measurement of $B^{+}\to K^{+}+\mathrm{inv}$, which is $2.8\sigma$ above the Standard Model prediction. We explore the available parameter space of new…