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Dispersive estimate of the electromagnetic charge symmetry violation in the octet baryon masses

We explore the electromagnetic contribution to the charge symmetry breaking in the octet baryon masses using a subtracted dispersion relation based on the Cottingham formula. For the proton-neutron mass splitting we report a minor revision of the recent analysis of Walker-Loud, Carlson and Miller. For the electromagnetic structure of the hyperons we constrain our analysis, where possible, by a combination of lattice QCD and SU(3) symmetry breaking estimates. The results for the baryon mass splittings are found to be compatible with recent lattice QCD+QED determinations. The uncertainties in the dispersive analysis are dominated by the lack of knowledge of the hyperon inelastic structure.

preprint2014arXivOpen access
F. B. ErbenP. E. ShanahanA. W. ThomasR. D. Young
hep-phnucl-th
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F. B. ErbenP. E. ShanahanA. W. ThomasR. D. Young

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