A general expression for the two-photon form factor of neutral pseudoscalar mesons is given in a quark triangle model. Various electromagnetic decay amplitudes are calculated, including Dalitz pair decays and the rare decay into a lepton pair, where an old calculation in a similar (nucleon loop) model is corrected. The results are in agreement with other calculations based on vector meson dominance, giving a new example of Q2 duality. Some remarks concerning the soft limit in the processes are given. © 1983.
|Journal||Nuclear Physics, Section B|
|Publication status||Published - 21 Nov 1983|
Ametller, L., Bergström, L., Bramon, A., & Massó, E. (1983). The quark triangle: Application to pion and eta decays. Nuclear Physics, Section B, 228(2), 301-315. https://doi.org/10.1016/0550-3213(83)90326-7