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A finite energy sum rule (FESR) analysis of the isospin-breaking vectorcurrent correlator <0|T(V^3_\mu V^8_\nu)|0> is used to determine theisospin-breaking electromagnetic (EM) decay constants of the low-lying vectormesons. These results are used to evaluate the corrections required to extractthe flavor diagonal 33 and 88 resonance contributions from the full resonanceEM contributions to the EM spectral function. A large (~15%) correction isfound in the case of the omega contribution to the isoscalar spectral function.The implications of these results for sum rules based on theisovector-isoscalar spectral difference are considered.Comment: Presentation to the 3rd International Conference on Symmetries in  Subatomic Physics, Adelaide, Mar. 13-17, 200

Isospin breaking in the extraction of isovector and isoscalar spectral functions from e[sup +]e[sup −]→hadrons