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.

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