eta, eta-prime -> pi^+ pi^- gamma with coupled channels
arXiv:hep-ph/0405039 · doi:10.1016/j.nuclphysa.2004.05.006
Abstract
The decays eta, eta-prime -> pi^+ pi^- gamma are investigated within an approach that combines one-loop chiral perturbation theory with a coupled channel Bethe-Salpeter equation which satisfies unitarity constraints and generates vector mesons dynamically from composite states of two pseudoscalar mesons. It is furthermore shown that the inclusion of the eta-prime as a dynamical degree of freedom does not renormalize the Wess-Zumino-Witten term.
21 pages, 11 figures