Speaker
Description
In this talk, I will revisit the Standard Model (SM) predictions for $\mathcal{B}(B \to K^{(\ast)}\nu\bar{\nu})$ and discuss the opportunities that open up when combining its partial decay with that of $\mathcal{B}(B → K^{(\ast)}\mu\mu)$. I will argue that the differential measurement of $B \to K\nu\bar{\nu}$ decays allow for an useful cross-check of the shape of the vector form-factor ($f_+(q^2)$), which is only computed at high-$q^2$ on the lattice and extrapolated to the physical region. I will then show that the ratios $\mathcal{B}(B \to K^{(\ast)}\mu{\mu})/\mathcal{B}(B \to K^{(\ast)}\nu\bar{\nu})$ allow for a clean extraction of $C_9^{\mu\mu}$, which is independent of the $B\to K^{(\ast)}$ form-factors to a first approximation. Lastly, I will show that the same ratio also proves to be more sensitive to the presence of New Physics in many plausible extensions of the SM.
