Existence of sigma meson in pi-pi scattering

Abstract

In this talk I summarize a recently proposed mechanism to understand pi pi scattering to 1 GeV. The model is motivated by the 1/Nc expansion to QCD, and includes a current algebra contact term and resonant pole exchanges. Chiral symmetry plays an important role in restricting the form of the interactions. The existence of a broad low energy scalar (sigma) is indicated.

7 pages (LaTeX), 2 PostScript figures (need epsf.tex). Talk given at 1996 International Workshop on ``Perspectives of Strong Coupling Gauge Theories'' (Nov. 13--16, 1996, Nagoya)