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We discuss the pion and kaon distribution amplitudes up to twist-3 in thecontext of the random instanton vacuum (RIV). We construct explicitly thepertinent quasi-pion and quasi-kaon distributions in the RIV, and analyze themin leading order in the diluteness factor, at a resolution fixed by the inverseinstanton size. The distribution amplitudes (DA) follow from the large momentumlimit. The results at higher resolution are discussed using QCD evolution, andcompared to their asymptotic limits and some lattice results.

Pion and Kaon Distribution Amplitudes up to twist-3 in the QCD Instanton Vacuum