2 00 8 Review of Scalar
نویسنده
چکیده
The formulae needed to parametrise σ, κ, a0(980) and f0(980) are reviewed. For σ and κ, the Adler zero due to Chiral Symmetry Breaking plays a crucial role. The f0(980) and a0(980) are locked to the KK threshold by a cusp mechanism which leads to a sharp peak in attraction at the threshold. This mechanism may play a wider role. A novel suggestion is that the confinement potential involves a cooperative effect between QCD effects (coloured quarks and gluons) and conventional meson exchanges. PACS numbers: 13.25.Gv, 13.25.Hw, 14.40.Gx. 14.40.Nd
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