Strange Baryon Electromagnetic Form Factors and SU(3) Flavor Symmetry Breaking

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 (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.

26 pages, 17 figures

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• Octet baryon electromagnetic form factors in nuclear medium
• Electric form factors of the octet baryons from lattice QCD and chiral extrapolation
• Octet baryon electromagnetic form factors in a relativistic quark model
• Using baryon octet magnetic moments and masses to fix the pion cloud contribution
• Octet Baryon Magnetic Moments from Lattice QCD: Approaching Experiment from a Three-Flavor Symmetric Point
• SU(2) Low-Energy Constants from Mixed-Action Lattice QCD
• Evidence for non-analytic light quark mass dependence in the baryon spectrum
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• Basis light-front quantization approach to $\Lambda$ and ${\Lambda }_c$ and their isospin triplet baryons
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• Renormalization of the baryon axial vector current in large-N_c chiral perturbation theory: Effects of the decuplet-octet mass difference and flavor symmetry breaking
• Meson cloud contributions to baryon axial form factors
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• Electromagnetic form factors of neutron and neutral stange hyperons in the oscillating view of point
• Gravitational form factors of hyperons in light-cone QCD
• Study of baryon octet electromagnetic form factors in perturbative chiral quark model
• Hyperon Electromagnetic Properties in Two-Flavor Chiral Perturbation Theory
• A covariant model for the decuplet to octet Dalitz decays
• Electromagnetic form factors of octet baryons in QCD
• Chiral Effective Theory Methods and their Application to the Structure of Hadrons from Lattice QCD
• Octet baryon electromagnetic form factor double ratios $(G_E^{\ast }/G_M^{\ast })/(G_E/G_M)$ in a nuclear medium
• Electromagnetic form factors of ${\Sigma }^{+}$ and ${\Sigma }^{-}$ in the vector meson dominance model
• Electroweak form factors of baryons in dense nuclear matter
• Analysis of ${\gamma }^{\ast }\Lambda \to {\Sigma }^0$ transition in QCD
• Isovector Axial Vector Form Factors of Octet-Decuplet Hyperon Transition in QCD
• Hyperon Form Factors from N_f=2+1 QCD