Abstract
We consider the transition (${\ensuremath{\gamma}}^{*}{\ensuremath{\pi}}^{0}(\ensuremath{\eta},{\ensuremath{\eta}}^{\ensuremath{'}})\ensuremath{\rightarrow}\ensuremath{\gamma}$) and electromagnetic (${\ensuremath{\gamma}}^{*}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$) form factors in a wide range of energy-momentum transfer $s$. We employ dispersion relations to connect the timelike and spacelike regions. We discuss the role of resonances and QCD partonic contributions. We find that the former give sizable contributions in the currently available range of $s$ and for the latter we consider the role of Reggeized fermion exchange.
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