On the nature of the lightest scalar resonances

Details On the nature of the lightest scalar resonances On the nature of the lightest scalar resonances

2004-11-29

arxiv.org/abs/hep-ph/0411375v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk presented by Zheng at ``Quark Confinement and Hadron Spectroscopy VI'', 21--25 Sept. 2004, Cagliari, Italy. 3 pages with

Scientific paper

10.1063/1.1920981

We briefly review the recent progresses in the new unitarization approach being developed by us. Especially we discuss the large $N_c$ $\pi\pi$ scatterings by making use of the partial wave $S$ matrix parametrization form. We find that the $\sigma$ pole may move to the negative real axis on the second sheet of the complex $s$ plane, therefore it raises the interesting question that this `$\sigma$' pole may be related to the $\sigma$ in the linear $\sigma$ model.

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