Abstract
In the framework of the dispersion relation N/D-approach, we restore the low-energy ππ (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 ππ threshold, that is the light σ-meson.
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Anisovich, V.V., Nikonov, V.A. The light σ-meson. Eur. Phys. J. A 8, 401–404 (2000). https://doi.org/10.1007/s100500070093
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DOI: https://doi.org/10.1007/s100500070093