S.V.Mikhailov (BLTP, JINR, Dubna)
Exclusive hard processes with light mesons in QCD: description of its nonperturbative and perturbative ingredients.
The main elements of the collinear factorization for these reactions are considered: distribution amplitudes (DA), hard amplitudes, the kernels of QCD evolution equations. DA for light mesons are obtained in the framework of QCD sum rules with nonlocal vacuum condensates. Multiloop ERBL (DGLAP) evolution kernels and NNLO spectral densities for light-cone sum rules are obtained for photon-meson transition form factors. All these ingredients are applied to describe the experimental data of photon-pion transition form factor from CELLO, CLEO collaborations. The correspondence with new BaBar data is discussed.