Electromagnetic-mass formula and a model of baryons

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How to explain the electromagnetic-mass difference of hadrons has been one of the problems embarrassing people for a long time. Field-theoretically it is difficult to take out the main effect of the complicated strong interactions. Experimentally, electromagnetic masses of hadrons seem to have values which allow no simple quali tat ive explanation. When two baryons in an isomultiplet are compared, a baryon with less charge has always larger mass. Such an experimental tendency, however, seems to suggest that these masses are distributed under a certain law. Such an indication also appears in the fact tha t the mean mass difference of baryons in an isomultiplet increases with the absolute value of the strangeness S. The well-know Coleman-Glashow relation

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