Pseudoscalar meson transition form factors

Abstract

Present-day experimental and phenomenological situation about pseudoscalar (${\pi }^0$, $\eta$, ${\eta }^{\prime }$) meson transition form factors is briefly reviewed. Necessity of more sophisticated behaviours in time-like region of these form factors is emphasized. Four-resonance unitary and analytic model of the pseudoscalar meson transition form factors is constructed, which describes well all existing experimental information.

Comments: 3 eps figures. Contribution presented at the PHOTON'03, April 7-11, 2003, Frascati (Roma), Italy