%0 Journal Article
%T The role of chiral loops in $¦Ç\to¦Ð^0¦Ð^0¦Ã¦Ã$
%A S. Bellucci
%A G. Isidori
%J Physics
%D 1996
%I arXiv
%R 10.1016/S0370-2693(97)00669-2
%X We consider the rare decay $\eta\to\pi^0\pi^0\gamma\gamma$ and calculate the non-resonant contribution to the amplitude to one loop in Chiral Perturbation Theory. We display our result as both a diphoton energy spectrum and a partial decay rate as a function of the photon energy cut. It turns out that the one-loop correction can be numerically very important and could be detected, at sufficiently large center-of-mass photon energies, from a measurement of the partial decay width.
%U http://arxiv.org/abs/hep-ph/9610328v2