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Alexandr Pimikov

JINR - Dubna
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QCD sum rules concepts and pion's structure

Abstract:
We study the pion's structure in terms of the leading twist pion
distribution amplitude, the electromagnetic form factor, and the
transition pion-photon form factor in framework of QCD sum rules with
nonlocal condensate and light-cone sum rules. The condensate's nonlocality
effects are shown to be important. A global fit of pion distribution
amplitude to the data from different collaborations (CELLO, CLEO, BaBar)
on the pion-photon transition form factor is carried out using light-cone
sum rules. The analysis includes the next-to-leading QCD radiative
corrections and the twist-four contributions, while the main
next-to-next-to-leading term and the twist-six contribution are taken into
account in the form of theoretical uncertainties.

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