On the pion distribution amplitude. Derivation, properties, predictions

We provide an in-depth analysis of the $π$ distribution amplitude in terms of two different Gegenbauer representations. Detailed predictions for the $π-γ$ transition form factor are presented, obtained with light-cone sum rules. Various $π$ distribution amplitudes are tested and the crucial role of their endpoint behavior in the form-factor analysis is discussed. Comparison with the data is given.

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