Eta decays at and beyond $\mathbf{p^4}$ in Chiral Perturbation Theory

Abstract

An overview is given of Chiral Perturbation Theory and various applications to eta decays. In particular, the main decay $\eta\to3\pi$ is discussed at the one-loop level, and estimates of the higher order corrections are given. The importance of $p^6$ and higher order effects in double Dalitz and $\eta\to\pi^0\gamma\gamma$ decays is pointed out. In all these cases the need for new experimental results is stressed.