Scalar form factors and nuclear interactions

Abstract

The scalar-isoscalar term in the two-pion exchange $NN$ potential is abnormally large and does not respect the hierarchy of effects predicted by chiral perturbation theory. We argue that this anomaly is associated with non-perturbative effects, which are also present in the $\pi N$ scalar form factor.

Comments: Talk given at the 20EFB, Pisa, Italy, September 2007. 3 pages and 4 figures