Abstract
The various current algebra sum rules for virtual isovector photons scattering on pions with I = 1,2 in the t-channel are studied with a view to saturation by the π, ω and A 1 intermediate states. A consistent set of ϱ dominated form factors are found which reproduce the strong coupling constants of Gilman and Harari. These form factors are used in a calculation of the π electromagnetic mass difference which automatically contains the current algebra result. Analogous form factors are chosen in a calculation of the K e.m. mass difference which includes a re-evaluation of the FESR for the high-energy A 2 contribution. Some remarks are also made about the relevance of the deep inelastic scaling region and it is shown how its contribution to the overall e.m. mass shift might be finite.
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