Pion Scattering Revisited
arXiv:hep-ph/9904224 · doi:10.1063/1.1301413
Abstract
Chiral Ward identities lead to consistent accounting for the sigma's width in the linear sigma model's Feynman rules. Reanalysis of pion scattering data at threshold imply a mass for the sigma of 600+ 200 - 100 MeV.
latex; VIII EMPC (Oaxaca, Nov 98) Proceedings