Abstract
I calculate the form factors describing semileptonic and penguin-induced decays of B mesons into light pseudoscalar mesons. Theform factors are calculated from QCD sum rules on the light-cone including contributions up to twist 4, radiative corrections to the leading twist contribution and SU(3)-breaking effects. The theoretical uncertainty is estimated to be ∼ 20%. The heavy-quark-limit relations between semileptonic and penguin form factors are found to be valid in the full accessible range of momentum transfer.