Observation of $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$

A. Ishikawa

We report the first observation of the flavor-changing neutral current decay $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$ and an improved measurement of the decay $B\to K{\ell }^{+}{\ell }^{-}$, where $\ell…