Sigma-term physics

Abstract

We consider sigma-terms in $\pi \pi$, $\pi N$ and $KN$ scattering. While the state of the art in $\pi \pi$ is in principle crystal clear, the kaon-nucleon case is largely unexplored. The pion-nucleon system is in-between. We propose a list of topics to be investigated in kaon-nucleon scattering, in order to make optimal use of the precision data expected from DEAR.

Comments: 10 pages (LaTex). Invited talk given at the Workshop "Physics and Detectors for DAFNE", Frascati, Nov. 16-19, 1999