Pion Distribution Amplitude and Photon-to-Pion Transition Form Factor in QCD

We discuss the status of the pion distribution amplitude (DA) in connection with QCD sum rules and experimental data on the $γ^*γ^\to π^0$ transition form factor. Contents: (a) Pion DA in generalized QCD Sum Rules (SRs); (b) Light Cone Sum Rules (LCSR) analysis of the CLEO data for the $γ^*γ\toπ^{0}$ transition form factor; (c) Recent lattice QCD data for the pion DA; (d) BaBar data---a challenge for QCD?

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