Distribution Amplitudes – a Reprise

We review the status of the leptonic decay constants f K and f ,⊥ K of the K and K * , respectively , and the SU(3) breaking quantities a 1 (K) and a ,⊥ 1 (K *), the first Gegenbauer-moments of the leading-twist distribution amplitudes of K and K *. We obtain new predictions from QCD sum rules which are relevant for the calculation of K and K * form factors, for instance T B→K * 1 , which determines the decay B → K * γ, and for QCD factorisation calculations of nonleptonic B decays into strange mesons, for instance B → Kπ.