The η → π+π-0γ decay is discussed in the general context of Chiral Perturbation Theory (ChPT), assuming that the low-energy constants (counterterms) are saturated by vector-meson resonances. The η → π+π-Tr0γ amplitude can be separated in two distinct pieces: the inner bremsstrahlung, A(IB), and the structure dependent (or direct emission), A(SD), amplitudes. The former - which essentially contains the same physics as A(η → π+π-π0) - is found to dominate over the second one - which looks more interesting from the ChPT point of view.
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 6 Jun 1996|