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Exploring the structure of a possible light scalar nonet

Deirdre Black·Amir H. Fariborz·Joseph Schechter
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Abstract

We first review the work of the Syracuse group, which uses an effective chiral Lagrangian approach, on meson-meson scattering. An illustration providing evidence for the existence of a strange scalar resonance of mass around 900 MeV is given. An attempt to fit this $κ(900)$ together with a similarly obtained $σ(560)$ and the well known $a_0(980)$ and $f_0(980)$ into a nonet pattern suggests that the underlying structure is closer to a dual quark-dual antiquark than to a quark-antiquark. A possible mechanism to explain a next higher-in mass scalar meson nonet is also discussed. This involves mixing between $q{\bar q}$ and $qq{\bar q} {\bar q}$ states.

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Deirdre Black, Amir H. Fariborz, Joseph Schechter. 2000-08-23. Exploring the structure of a possible light scalar nonet. https://arxiv.org/abs/hep-ph/0008246

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