Property of σ(600) and Chiral Symmetry

Abstract

The iso-singlet scalar resonance σ(600), found in the recent ππphase shift analysis, is pointed out to have the properties of the σmeson in the σmodel. The role of the λϕ^4 interaction as a source of the ``background phase", which was essential there, is also discussed.

4pages, Latex with Prog.Theor.Phys. format PTPTEX.sty, no figures, to be published in Prog.Theor.Phys.96(1996)

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• Possible Classification of the Chiral Scalar sigma-Nonet
• Nature of the sigma meson as revealed by its softening process
• Density dependence of meson - nucleon vertices in nuclear matter
• The nucleon-nucleon interaction and properties of the nucleon in a $\pi \rho \omega$ soliton model including a dilaton field with anomalous dimension
• Existence of σ(600)/κ(900)-Particle and New Chiral Scalar Nonet ``Chiralons''
• The Linear Sigma Model at Work: Succesful Postdictions for Pion Scattering
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