Disentangling left and right-handed neutrino effects in $B\to K^{(\ast )}\nu \nu$

L. P. S. Leal, S. Rosauro-Alcaraz

The first observation of $\mathcal{B}\left(B^{+}\to K^{+}\nu \nu \right)$ by the Belle II experiment lies almost $3\sigma$ away from the Standard Model expectation. In this letter we stud…