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

Abstract

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.

6 pages, 7 figures, 2 tables. Talk presented at International Workshop on e^+e^- collisions from Phi to Psi, Frascati, Italy, 7-10 April 2008. V2 is an exclusive HEP version which includes predictions from AdS/QCD. V3: typo in title corrected

References in corpus (5)

• Moments of pseudoscalar meson distribution amplitudes from the lattice
• Pion Form Factor in Improved Holographic QCD Backgrounds
• Analyticity properties of three-point functions in QCD beyond leading order
• Lattice Results for Vector Meson Couplings and Parton Distribution Amplitudes
• Polarized and unpolarized $\mu$-pair meson-induced Drell--Yan production and the pion distribution amplitude

Cited by in corpus (2)

• Pion transition form factor in k_T factorization
• QCD sum rules with nonlocal condensates and the spacelike pion form factor