%0 Journal Article
%T Pion-pion interaction at low energy
%A M. E. Sainio
%J Physics
%D 1998
%I arXiv
%X A brief discussion of the elastic pion-pion scattering amplitude to two loops in chiral perturbation theory is given. Some technical details of the evaluation of two-loop diagrams are addressed, and results relevant for the pionium decay are presented.
%U http://arxiv.org/abs/hep-ph/9808209v1