THE LARGE MOMENTUM TRANSFER BEHAVIOUR OF MESON-PHOTON TRANSITION FORM FACTORS

Abstract

It is reported on predictions for the $π$-$γ$ transition form factor obtained within a perturbative approach which includes transverse momentum effects and Sudakov corrections. The results clearly favor distribution amplitudes close to the asymptotic form, $\sim x_1x_2$, and disfavor distribution amplitudes which are strongly concentrated in the end-point regions. Applications of that approach to the $η$-$γ$ and $η^\prime$-$γ$ transition form factors are discussed as well.

6 pages, 3 figures, included in one compressed, uuencoded PS-file