Photon-photon interactions via pseudoscalar fields
(Budker Inst. Nuclear Physics)
Aula Salvini (LNF INFN)
The aim of this talk is to review several aspects of two-gamma physics in relation to the exclusive process gamma gamma -> pseudoscalar meson, described by a transition form factor, as a function of the squared transfer momenta of the two photons. On this basis, the motivation for this kind of research, as well as its current status from theoretical and experimental points of view, will be discussed, e.g., recent BaBar measurements of the double off-shell photon transitions to eta' mesons.