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

F. B. Erben, P. E. Shanahan, A. W. Thomas, and R. D. Young
Phys. Rev. C 90, 065205 – Published 23 December 2014

Abstract

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 [Phys. Rev. Lett. 108, 232301 (2012)]. 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.

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  • Received 8 September 2014
  • Revised 2 December 2014

DOI:https://doi.org/10.1103/PhysRevC.90.065205

©2014 American Physical Society

Authors & Affiliations

F. B. Erben1,2, P. E. Shanahan1, A. W. Thomas1, and R. D. Young1

  • 1CSSM & CoEPP, Department of Physics, University of Adelaide, Adelaide, South Australia 5005, Australia
  • 2Institut für Kernphysik, Becher-Weg 45, University of Mainz, D-55099 Mainz, Germany

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Vol. 90, Iss. 6 — December 2014

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