Rare B \to K^{(*)} \nu\bar\nu Decays at B Factories

Abstract

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

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