We use QCD sum rules to calculate the hadronic matrix elements governing the rare decays B → Kℓ + ℓ − and B → K * ℓ + ℓ − induced by the flavour changing neutral current b → s transition. We also study relations among semileptonic and rare 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.
We use QCD sum rules to calculate the hadronic matrix elements governing the rare decays B ! K`+` and B ! K `+` induced by the avour changing neutral current b ! s transition. We also study relations among semileptonic and rare B ! K
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