Abstract
Phenomenological Lagrangians that exhibit (broken) chiral symmetry as well as isospin violation suggest short-range charge symmetry breaking (CSB) nucleon-nucleon potentials with a σ 1 · σ 2 structure. This structure could be realized by the mixing of axial-vector (1 +) mesons in a single-meson exchange picture. The Coleman-Glashow scheme for ΔI z = 1 charge symmetry breaking applied to meson and baryon SU(2) mass splittings suggests a universal scale. This scale can be extended to ΔI = 1 nonstrange CSB transitions 〈 a 1 o | H em | f 1〉 of size −0.005 GeV 2. The resulting nucleon-nucleon axial-vector meson exchange CSB potential then predicts ΔI = 1 effects which are small.
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