Universality of ΔI=1 meson mixing and charge symmetry breaking

The Coleman-Glashow scheme for Δ${\mathit{I}}_{\mathit{z}}$=1 charge symmetry breaking (CSB) applied to meson and baryon SU(2) mass splittings suggests a universal scale. This scale can be extended to ΔI=1 nonstrange CSB transitions 〈${\mathrm{\rho }}^0$‖${\mathit{H}}_{\mathrm{em}}$‖ω〉 and 〈${\mathrm{\pi }}^0$‖${\mathit{H}}_{\mathrm{em}}$‖${\mathrm{\eta }}_{\mathit{N}\mathit{S}}$〉 of size -0.005 ${\mathrm{GeV}}^2$ in the energy region 760–780 MeV. The resulting nucleon-nucleon vector meson exchange CSB potential then predicts ΔI=1 effects which are in approximate agreement with recent data characterizing nuclear charge asymmetry.