Pion Scattering Revisited
M. Ruiz-Altaba, J. L. Lucio, M. Napsuciale
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.
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