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

Understand

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.