New vistas of the meson structure in QCD from low to high energies

Details New vistas of the meson structure in QCD from low to high energies New vistas of the meson structure in QCD from low to high energies

2008-05-20

arxiv.org/abs/0805.3117v3

Nucl.Phys.Proc.Suppl.181-182:199-203,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 7 figures, 2 tables. Talk presented at International Workshop on e^+e^- collisions from Phi to Psi, Frascati, Italy,

Scientific paper

10.1016/j.nuclphysbps.2008.09.03

This talk presents issues pertaining to the quark structure of the pion within 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's electromagnetic form factor vs. corresponding experimental data from the CLEO Collaboration and the JLab. We also examine the extent to which recent high-precision lattice computations of the second moment of the pion's distribution amplitude conform with theoretical models. Finally, we include predictions for the azimuthal asymmetry of the $\mu^+$ distribution in the polarized $\mu$-pair-induced DY production employing various pion distribution amplitudes.

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