The light sigma meson
classification
✦ hep-ph
keywords
lightmesonpi-pisigmaamplitudecomplex-sd-amplituded-approach
read the original abstract
In the framework of the dispersion relation N/D-approach, we restore the low-energy pi-pi (IJ^{PC}=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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