Phenomenological Lagrangians and dimensional power counting are used to assess isospin violation in the nucleon-nucleon force. The πNN coupling constants (including the Goldberger-Treiman discrepancy), charge-symmetry breaking, and meson-mixing models are examined. A one-loop analysis of the isospin-violating πNN coupling constants is performed using chiral perturbation theory. Meson-mixing models and the 3He 3H mass difference are also discussed in the context of naturalness.
Physics Letters B
- Pub Date:
- February 1996
- Nuclear Theory;
- High Energy Physics - Phenomenology
- 10 pages, latex, 1 figure -- To appear in Physics Letters B -- epsfig.sty required