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

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

preprint2021arXivOpen access
Arthur KockIsmail Zahed
hep-ph
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Arthur KockIsmail Zahed

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