Phenomenological Aspects of Isospin Violation in the Nuclear Force
U. van Kolck, J. L. Friar, T. Goldman
Abstract
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.
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