Mapping out the quark structure of hadrons in QCD

摘要

In the context of QCD sum rules with nonlocal condensates, we present a pion distribution amplitude that is double-humped with its endpoints x --> (0, 1) strongly suppressed and show that it both matches the CLEO experimental data on the pion-photon transition at the la level of accuracy and is in compliance with the CELLO data. We also include some comments on the nucleon distribution amplitude and the nucleon evolution equation.