The light σ-meson
St. Petersburg Nuclear Physics Institute, Gatchina, 188350, Russia
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Published online: 15 September 2000
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.
PACS: 12.39.Mk Glueball and nonstandard multi-quark/gluon states – / 12.38.-t Quantum chromodynamics – / 14.40.-n Mesons –
© Società Italiana di Fisica and Springer-Verlag, 2000