Chiral Perturbation Theory for η -> 3 π and η -> π⁰ γγ

I will give an overview of ChPT aspects of η to 3 π and discuss the known results at two-loop order.
This will include the relationship between the charged and neutral decay and a naive discussion of convergence properties.
The decay η to π0γγ is expected to have very small loop contributions. I will discuss the reason for this and the theoretical predictions for this decay.