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Mapping out the quark structure of hadrons in QCD
Alexander P. Bakulev, S. V. Mikhailov, N. G. Stefanis
In the context of QCD sum rules with non-local condensates we present a pion distribution amplitude, which is double-humped with its end-points x\to(0,1) strongly suppressed, and s…
Accessing the pion distribution amplitude through the CLEO and E791 data
Alexander P. Bakulev, S. V. Mikhailov, N. G. Stefanis
Using QCD perturbation theory in NLO and light-cone QCD sum rules, we extract from the CLEO experimental data on the F^{γ^*γπ}(Q^{2} transition form factor constraints on the Gegen…
What is this thing called pion distribution amplitude? From theory to data
Alexander P. Bakulev, S. V. Mikhailov, N. G. Stefanis
We discuss the status of the pion distribution amplitude (DA) from analyzing the CLEO experimental data in the context of QCD sum-rule techniques and QCD perturbation theory at the…
The gluon content of the and mesons and the , electromagnetic transition form factors
S. S. Agaev, N. G. Stefanis
We compute power-suppressed corrections to the ηγand η^{\prime}γtransition form factors Q^2F_{η(η^{\prime})γ}(Q^2) arising from the end point regions x \to 0,1 by employing the inf…
CLEO and E791 data: A smoking gun for the pion distribution amplitude?
Alexander P. Bakulev, S. V. Mikhailov, N. G. Stefanis
The CLEO experimental data on the transition are analyzed to next-to-leading order accuracy in QCD perturbation theory using light-cone QCD sum rules. By processing these data…
Unbiased analysis of CLEO data at NLO and pion distribution amplitude
A. P. Bakulev, S. V. Mikhailov, N. G. Stefanis
We discuss different QCD approaches to calculate the form factor F^{γ^*γπ}(Q^2) of the γ^*γ\toπ^{0} transition giving preference to the light-cone QCD sum rules (LCSR) approach as…