Pseudoscalar meson transition form factors

Abstract

Present-day experimental and phenomenological situation about pseudoscalar ($π^0$, $η$, $η'$) 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.

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