Superconvergent dispersion relations and I=2 electromagnetic mass differences of hadrons

Abstract

Explicit calculations have been presented for the I=2 electromagnetic mass difference between particles of a given isomultiplet using the superconvergent-dispersion-relation approach suggested by Harari. We obtain, in particular, the electromagnetic mass differences (i) π⁺-π⁰, (ii) ρ⁺-ρ⁰, (iii) Σ⁺+Σ^--2Σ0, (iv) N^∗+++N^∗0-2N^∗+, and (v) Y₁^∗++Y₁^∗+-2Y₁^∗0. The agreement of our results with experiments is excellent.