The light sigma meson
Abstract
In the framework of the dispersion relation N/D-approach, we restore the low-energy pi-pi (IJPC=00++)-wave amplitude sewing it with the previously obtained K-matrix solution for the region 450-1900 MeV. The restored N/D-amplitude has a pole on the second sheet of the complex-s plane near the pi-pi threshold, that is the light sigma meson.
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