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Theoretical description and measurement of the pion-photon transition form factor

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arxiv 1401.4303 v2 pith:XEPV7RWJ submitted 2014-01-17 hep-ph

Theoretical description and measurement of the pion-photon transition form factor

classification hep-ph
keywords predictionsdatafactorformobtainedpion-photonrulestransition
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Detailed predictions for the scaled pion-photon transition form factor are given, derived with the method of light-cone sum rules and using pion distribution amplitudes with two and three Gegenbauer coefficients obtained from QCD sum rules with nonlocal condensates. These predictions agree well with all experimental data that are compatible with QCD scaling (and collinear factorization), but disagree with the high-$Q^2$ data of the BaBar Collaboration that grow with the momentum. A good agreement of our predictions with results obtained from AdS/QCD models and Dyson-Schwinger computations is found.

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