$\eta \to {\pi }^0\gamma \gamma$ decay within unitarized chiral perturbation theory

E. Oset, J. R. Pelaez, L. Roca

We improve the calculations of the $\eta \to {\pi }^0\gamma \gamma$ decay within the context of meson chiral lagrangians. We use a chiral unitary approach for the meson-meson interaction, thus genera…