QCD sum rule analysis of the decays B->Kl(+)l(-) and B->K*l(+)l(-)

We use QCD sum rules to calculate the hadronic matrix elements governing the ran decays B-->Kl(+)l(-) and B-->K*l(+)l(-) induced by the flavor-changing neutral current b-->s transition. We also study relations among semileptonic and ran B-->K(*) decay form factors. The analysis of the invariant mass distribution of the lepton pair in B-->K(*)l(+)l(-) and of the angular asymmetry in B-->K*l(+)l(-) provides us with interesting tests of the standard model and its extensions.