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

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arxiv 1005.3173 v1 pith:6TFE2DYM submitted 2010-05-18 hep-ph hep-ex

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

classification hep-ph hep-ex
keywords gammapiondatafactorformrulestransitionamplitude
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We discuss the status of the pion distribution amplitude (DA) in connection with QCD sum rules and experimental data on the $\gamma^*\gamma^\to \pi^0$ 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 $\gamma^*\gamma\to\pi^{0}$ transition form factor; (c) Recent lattice QCD data for the pion DA; (d) BaBar data---a challenge for QCD?

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