Exclusive decays of $\overrightarrow{B}{K}^{\left(*\right)}{l}^{+}{l}^{-}$ in perturbative QCD

We study the exclusive decays of $\overrightarrow{B}{K}^{\left(*\right)}{l}^{+}{l}^{-}$ within the framework of perturbative QCD. We obtain the form factors for the $\overrightarrow{B}{K}^{\left(*\right)}$ transitions in all allowed values of $q^2,$ which agree with the lattice results. We find that our distributions of the decay rates and leptonic asymmetries are consistent with that given in the other QCD models in the literature.