Sum rules and the electromagnetic mass difference of pions
Using the algebra of currents, we show that the electromagnetic pion mass-difference diverges in the soft-pion limit, if the usual spectral sum rules are assumed. We propose an altered sum rule which makes the result finite and in close agreement with experiment. © 1968.
Cook, CL; Evans, LE; Han, MY; Lipshutz, NR; Straumann, N
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