Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2008-12-23
Phys.Rev.D79:074507,2009
Physics
High Energy Physics
High Energy Physics - Lattice
26 pages, 17 figures
Scientific paper
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 (HBXPT). The systematic errors due to chiral and continuum extrapolations remain significant, giving rise to charge radii for $p$ and $\Sigma^-$ that are 3--4 standard deviations away from the known experimental ones. Within these systematics the predicted $\Sigma^+$ and $\Xi^-$ radii are 0.67(5) and 0.306(15) fm$^2$ respectively. When the next-to-next-to-leading order of HBXPT is included, the extrapolated magnetic moments are less than 3 standard deviations away from PDG values, and the discrepancy is possibly due to remaining chiral and continuum extrapolation errors.
Lin Huey-Wen
Orginos Kostas
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