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Abstract: This talk presents issues pertaining to the quark structure of the pionwithin QCD, both from the theoretical and from the experimental point of view.We review and discuss the pion-photon transition form factor and the pion-selectromagnetic form factor vs. corresponding experimental data from the CLEOCollaboration and the JLab. We also examine the extent to which recenthigh-precision lattice computations of the second moment of the pion-sdistribution amplitude conform with theoretical models. Finally, we includepredictions for the azimuthal asymmetry of the $\mu^+$ distribution in thepolarized $\mu$-pair-induced DY production employing various pion distributionamplitudes.



Autor: N. G. Stefanis

Fuente: https://arxiv.org/







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