Rare B \to K^{(*)} ν\barνDecays at B Factories

Abstract

We compute the branching fraction of the decays $B\to K\hat{I}½\bar{\hat{I}}½$ and $B\to K^{\ast }\hat{I}½\bar{\hat{I}}½$ in the Standard Model. We also comment on the experimental difficulties and procedures to detect such modes at B factories.

11 pages LaTeX + 2 eps figures. Version published in Physics Letters B