Strange baryon electromagnetic form factors and SU(3) flavor symmetry breaking

Huey-Wen Lin and Kostas Orginos
Phys. Rev. D 79, 074507 – Published 20 April 2009

Abstract

We study the nucleon, Sigma and cascade octet baryon electromagnetic form factors and the effects of SU(3) flavor symmetry breaking from 2+1-flavor lattice calculations. We find that electric and magnetic radii are similar; the maximum discrepancy is about 10%. In the pion-mass region we explore, both the quark-component and full-baryon moments have small SU(3) symmetry breaking. We extrapolate the charge radii and the magnetic moments using three-flavor heavy-baryon chiral perturbation theory. The systematic errors due to chiral and continuum extrapolations remain significant, giving rise to charge radii for p and Σ that are 3–4 standard deviations away from the known experimental ones. Within these systematics the predicted Σ+ and Ξ radii are 0.67(5) and 0.306(15)fm2, respectively. When the next-to-next-to-leading order of heavy-baryon chiral perturbation theory is included, the extrapolated magnetic moments are less than 3 standard deviations away from Particle Data Group values, and the discrepancy is possibly due to remaining chiral and continuum extrapolation errors.

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  • Received 10 January 2009

DOI:https://doi.org/10.1103/PhysRevD.79.074507

©2009 American Physical Society

Authors & Affiliations

Huey-Wen Lin*

  • Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA

Kostas Orginos

  • Department of Physics College of William, Williamsburg, Virginia 23187-8795, USA and Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA

  • *hwlin@jlab.org
  • kostas@wm.edu

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Issue

Vol. 79, Iss. 7 — 1 April 2009

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