TL;DR
This paper reviews chiral expansions of two-pion exchange in nuclear forces, discusses hierarchy patterns, and investigates the unexpectedly large scalar-isoscalar potential through the nucleon scalar form factor.
Contribution
It provides a detailed analysis of chiral expansions in nuclear interactions and explains the anomalously strong scalar-isoscalar potential.
Findings
Scalar-isoscalar potential is larger than expected.
Hierarchy pattern of two- and three-nucleon forces discussed.
Nucleon scalar form factor explains the potential anomaly.
Abstract
Chiral expansions of the two-pion exchange components of both two- and three-nucleon forces are reviewed and a discussion is made of the predicted pattern of hierarchies. The strength of the scalar-isoscalar central potential is found to be too large and to defy expectations from the symmetry. The causes of this effect can be understood by studying the nucleon scalar form factor.
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