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The Light scalar mesons within quark models

Authors: E. van Beveren, G. Rupp, N. Petropoulos and F. Kleefeld

Ref.: prepared for the 2nd International Workshop on Hadron Physics: Effective Theories of Low-Energy QCD, Coimbra, Portugal, 25-29 Sep 2002, published in AIP Conf. Proc. 660, 353-366 (2003)

Abstract: Low-energy meson-meson scattering data are a powerful testing ground for quark models. Here, we describe the behaviour at threshold of S-wave scattering-matrix singularities. The majority of the full scattering-matrix mesonic poles stem from an underlying confinement spectrum. However, the light scalar mesons K0*(830), a0(980), f0(400-1200), and f0(980) do not, but instead originate in 3P0-barrier semi-bound states. We show that the behaviour of the corresponding poles is identical at threshold. In passing, the light-meson sector is given a firm basis.

DOI: 10.1063/1.1570585

URL: link.aip.org